From 70c7da65c8f63e7b84cff7080e3ff80203398056 Mon Sep 17 00:00:00 2001 From: John Reese Date: Wed, 26 Aug 2026 15:16:23 +0100 Subject: [PATCH 1/2] feat: add keystone_anchor_seed_batch() for bulk anchor pre-population New C API that pre-populates the anchor table with evenly-spaced anchors from a sorted array. This "warms up" the interpolation search table so the first batch of lookups benefits from good anchor coverage without needing to learn anchors one-by-one from search misses. Useful for batch ingestion workflows where the full dataset is loaded before lookups begin. Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> --- include/keystone.h | 21 ++++++++++++++ src/keystone.c | 69 ++++++++++++++++++++++++++++++++++++++++++++++ 2 files changed, 90 insertions(+) diff --git a/include/keystone.h b/include/keystone.h index 32c3a53..d0400e8 100644 --- a/include/keystone.h +++ b/include/keystone.h @@ -327,6 +327,27 @@ keystone_result_t keystone_search_events( bool keystone_init_for_dsmil(keystone_anchor_table_t* table, int workload_type); int keystone_optimize_array_memory(int64_t* arr, size_t n); +/** + * @brief Pre-populate the anchor table with evenly-spaced anchors. + * + * Samples the sorted array at regular intervals and inserts anchors at + * those positions. This "warms up" the interpolation search table so + * that the first batch of lookups benefits from good anchor coverage + * without needing to learn anchors one-by-one from search misses. + * + * @param arr Sorted array of int64_t values + * @param n Number of elements in arr + * @param table Anchor table to populate (must not be NULL) + * @param anchor_count Number of anchors to insert (clamped to table->max_capacity) + * @return Number of anchors actually inserted + */ +size_t keystone_anchor_seed_batch( + const int64_t* arr, + size_t n, + keystone_anchor_table_t* table, + size_t anchor_count +); + #ifdef KEYSTONE_ENABLE_TAR_ZST #include "keystone_tar_zst.h" #endif diff --git a/src/keystone.c b/src/keystone.c index 383f45a..2302727 100644 --- a/src/keystone.c +++ b/src/keystone.c @@ -2321,3 +2321,72 @@ bool enhanced_available(void) { const char* enhanced_build_info(void) { return KEYSTONE_BUILD_INFO; } + +size_t keystone_anchor_seed_batch( + const int64_t* arr, + size_t n, + keystone_anchor_table_t* table, + size_t anchor_count +) { + size_t inserted = 0u; + size_t i; + + if (!arr || n == 0u || !table || !table->anchors || anchor_count == 0u) { + return 0u; + } + /* Clamp to max_capacity to avoid overfilling. */ + if (anchor_count > table->max_capacity) { + anchor_count = table->max_capacity; + } + /* Don't seed more anchors than data points. */ + if (anchor_count > n) { + anchor_count = n; + } + /* Grow capacity if needed. */ + if (anchor_count > table->capacity) { + size_t new_cap = table->capacity; + while (new_cap < anchor_count && new_cap < table->max_capacity) { + new_cap = (new_cap * 2u > table->max_capacity) ? + table->max_capacity : new_cap * 2u; + } + if (new_cap > table->capacity) { + keystone_anchor_t* new_anchors = realloc(table->anchors, + new_cap * sizeof(keystone_anchor_t)); + if (!new_anchors) { + return 0u; + } + table->anchors = new_anchors; + table->capacity = new_cap; + table->stats.memory_reallocations++; + } + } + /* Reset table — seeding replaces existing anchors. */ + table->size = 0u; + /* Sample at evenly-spaced intervals. */ + for (i = 0u; i < anchor_count; i++) { + size_t idx = (n * i) / anchor_count; + if (idx >= n) idx = n - 1u; + /* Find insertion point (anchors must stay sorted by value). */ + size_t pos = 0u; + while (pos < table->size && table->anchors[pos].v < arr[idx]) { + ++pos; + } + /* Skip duplicate values. */ + if (pos < table->size && table->anchors[pos].v == arr[idx]) { + continue; + } + /* Shift elements to make room. */ + if (pos < table->size) { + memmove(&table->anchors[pos + 1], &table->anchors[pos], + (table->size - pos) * sizeof(keystone_anchor_t)); + } + table->anchors[pos].v = arr[idx]; + table->anchors[pos].i = idx; + table->anchors[pos].use_count = 0u; + table->anchors[pos].last_used = keystone_next_anchor_timestamp(); + table->size++; + table->stats.anchors_learned++; + inserted++; + } + return inserted; +} From b14d0ce3303ce17d1a5bddfa066d67230482d96f Mon Sep 17 00:00:00 2001 From: John Reese Date: Fri, 28 Aug 2026 22:44:39 +0100 Subject: [PATCH 2/2] feat: SSE4.2 SIMD path, double-precision interpolation, OpenMP auto-enable for AVX1-only CPUs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Security fixes (P1/P2): - P1: tar.zst parser OOB read — bounded streaming integer parser - P1: CUDA cache race — reader-lease protocol with refcount + generation - P2: archive index min/max recomputed after sort - P2: auto-backend data races fixed with mutexes - P2: signed overflow in query-shape classifier using __int128 - P2: FNV hash collision verification against source bytes - QIHSE ingestion_principal security context through bridge Performance: - Archive index keys retention (eliminates repeat decompression) - LSD radix sort for hash index (O(n) vs qsort) - Zero-copy NumPy batch API (15.6x faster on 1M queries) Sandy Bridge / AVX1-only CPU support: - SSE4.2 branchless SIMD path (128-bit PCMPEQQ, 2x unrolled) - Double-precision interpolation (replaces __int128 div, 2x single-key speedup) - Software prefetch enabled for SSE4.2 (was #ifdef'd out on AVX1-only) - Branchless scalar fallback (enables auto-vectorization) - Wider SIMD scan window (64 on SSE4.2+, was 32) - OpenMP auto-enabled by default (2x batch speedup on 8-core) - Lowered parallel threshold to 4096 (was 16384) Benchmark (Xeon E5-2407, 2.2GHz, 8-core, AVX1+SSE4.2): Single-key: 317ns -> 157ns (2.0x) Batch+OpenMP: N/A -> 165ns (2.4x vs serial) Small-window: 125ns -> 82ns (1.5x) Generated with [Devin](https://devin.ai) Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com> --- CHANGELOG.md | 36 ++++ Makefile | 9 +- README.md | 17 +- benchmarks/bench_sse42.c | 134 +++++++++++++ benchmarks/dsmil_benchmark | Bin 167864 -> 150632 bytes benchmarks/performance_proof | Bin 154344 -> 145432 bytes cuda/keystone_cuda.cu | 290 +++++++++++++++++++-------- cuda/keystone_cuda.h | 38 +++- docs/BUILD_MODES.md | 15 +- include/dsmil_hash_indexer.h | 12 ++ include/keystone.h | 30 +++ include/qihse_keystone_bridge.h | 55 ++++++ python/keystone/core.py | 76 +++++++ src/dsmil_hash_indexer.c | 235 +++++++++++++++++----- src/keystone.c | 338 +++++++++++++++++++++++++++----- src/keystone_tar_zst.c | 245 ++++++++++++++++------- src/qihse_keystone_bridge.c | 84 ++++++-- tests/test_auto_backend.c | 11 +- 18 files changed, 1348 insertions(+), 277 deletions(-) create mode 100644 benchmarks/bench_sse42.c diff --git a/CHANGELOG.md b/CHANGELOG.md index 3c8f553..ed1beaa 100644 --- a/CHANGELOG.md +++ b/CHANGELOG.md @@ -2,6 +2,42 @@ All notable changes to the KEYSTONE search engine are documented in this file. +## [1.2.0] - 2026-08-28 + +### Security Fixes (P1/P2) +- **P1: tar.zst parser OOB read** — Replaced unbounded `strtoll()` with a bounded streaming integer parser that respects buffer length. Eliminates out-of-bounds read vulnerability in `.tar.zst` integer parsing. +- **P1: CUDA cache race** — Replaced spinlock-released-before-use pattern with a reader-lease protocol (refcount + generation). Eviction now waits for `readers == 0` before `cudaFree`. Added `keystone_search_batch_cuda_versioned()` with `dataset_version` for in-place host array mutation detection. Added `keystone_cuda_cache_invalidate()`. +- **P2: Archive index min/max** — `first_key`/`last_key` now recomputed from the sorted array after parsing, not trusted from stream order (wrong for unsorted source data). +- **P2: Auto-backend data races** — `g_backend_cache` and `g_last_backend_decision` protected by mutexes; `valid=1` published last after all fields written. Eliminates torn reads on concurrent access. +- **P2: Signed overflow in query-shape classifier** — All key deltas and `max-min` range computed in `__int128`, eliminating UB near `INT64_MIN`/`INT64_MAX`. +- **P2: FNV hash collision verification** — Hash indexer now retains original string bytes and verifies them on every positive hit, eliminating false matches from 64-bit hash collisions. +- **QIHSE ingestion principal** — Bridge carries an authenticated `ingestion_principal` via `keystone_qihse_bridge_set_principal()`. New `keystone_qihse_bridge_dispatch_credential_authenticated()` uses `qihse_kv_set_user()` and refuses writes without a principal, per QIHSE AGENTS.md invariant #1. + +### Performance +- **Archive index keys retention** — Sorted keys retained in `tar_zst_index_entry`, eliminating repeat decompression/parsing for positive lookups. Fallback re-streams if keys not retained. +- **LSD radix sort** — Replaced `qsort` with 8-pass LSD radix sort (O(n), sequential memory access) for 64-bit hash keys, carrying offsets/strings/lens. +- **Zero-copy NumPy batch API** — New `keystone_search_keys_batch_auto()` takes raw `int64_t*` keys and `size_t*` results directly from NumPy buffers. Python `search_batch_keys()` skips per-key `_CBatchItem` marshalling. **15.6x faster** on 1M queries (0.151s vs 2.351s). + +### Correctness +- **Anchor LRU tracking** — Endpoint anchors now initialize `use_count`/`last_used`; usage-update block no longer guards on `active_table != table`, so caller table anchors get LRU timestamps refreshed. + +### Sandy Bridge / AVX1-only CPU Support +- **SSE4.2 SIMD path** — Added branchless 128-bit SIMD path (`_mm_cmpeq_epi64` / PCMPEQQ) to `keystone_chunked_search`, 2x unrolled for Sandy Bridge's dual 128-bit execution ports. Previously AVX1-only CPUs fell through to a scalar loop that couldn't auto-vectorize. +- **Double-precision interpolation** — Replaced `__int128` division (80-100+ cycle libgcc `__divti3` call) with double-precision fast path (~20-40 cycles). `__int128` fallback only for overflow edge cases. **2x faster single-key search** on Sandy Bridge. +- **Software prefetch enabled for SSE4.2** — Prefetch was `#ifdef`'d out on AVX1-only CPUs. Added SSE4.2 branch with Sandy Bridge-tuned distances (32/64 elements vs 64/128). +- **Branchless scalar fallback** — Removed early returns that blocked GCC auto-vectorization. +- **Wider SIMD scan window** — `keystone_local_search` uses 64-element window on SSE4.2+ (was fixed at 32). +- **OpenMP auto-enabled** — Makefile auto-detects compiler OpenMP support and enables `-fopenmp` by default. **2x faster batch search** on 8-core machines. +- **Lowered parallel threshold** — Auto-backend uses OpenMP for batches >= 4096 items (was 16384). Configurable via `KEYSTONE_AUTO_PARALLEL_MIN_ITEMS`. + +### Benchmark Results (Sandy Bridge Xeon E5-2407, 2.2GHz, 8-core) +| Metric | Before | After | Speedup | +|--------|--------|-------|---------| +| Single-key search | 317 ns | 157 ns | 2.0x | +| Batch (serial) | 400 ns | 330 ns | 1.2x | +| Batch (auto+OpenMP) | N/A | 165 ns | 2.4x | +| Small-window scan | 125 ns | 82 ns | 1.5x | + ## [1.1.0] - Upcoming ### API Changes diff --git a/Makefile b/Makefile index 0b6a0de..b9d0eba 100644 --- a/Makefile +++ b/Makefile @@ -5,10 +5,17 @@ CC := gcc CFLAGS := -O3 -march=native -fPIC -Wall -Wextra -Werror=implicit-function-declaration -I./include -DKEYSTONE_ENABLE_PLATFORM_TUNING LDFLAGS := -lm -# Optional OpenMP +# Optional OpenMP (default: auto-enabled if the compiler supports it, +# since multi-core CPUs benefit from parallel batch search. Set +# KEYSTONE_ENABLE_OPENMP=0 to disable.) ifeq ($(KEYSTONE_ENABLE_OPENMP),1) CFLAGS += -fopenmp LDFLAGS += -fopenmp +else ifneq ($(KEYSTONE_ENABLE_OPENMP),0) + ifeq ($(shell echo | $(CC) -fopenmp -dM -E - 2>/dev/null | grep -q '_OPENMP' && echo yes),yes) + CFLAGS += -fopenmp + LDFLAGS += -fopenmp + endif endif # Optional tar.zst streaming support (default: enabled if libarchive + libzstd are available) diff --git a/README.md b/README.md index 0040055..15d6315 100644 --- a/README.md +++ b/README.md @@ -7,7 +7,7 @@ [![C](https://img.shields.io/badge/C-11-blue.svg)](https://en.wikipedia.org/wiki/C11_(C_standard_revision)) [![Fortran](https://img.shields.io/badge/Fortran-90%2B-purple.svg)](https://en.wikipedia.org/wiki/Fortran) [![Python](https://img.shields.io/badge/Python-3-yellow.svg)](https://www.python.org/) -[![SIMD](https://img.shields.io/badge/SIMD-AVX2%20%7C%20AVX--512-black.svg)](https://en.wikipedia.org/wiki/Advanced_Vector_Extensions) +[![SIMD](https://img.shields.io/badge/SIMD-SSE4.2%20%7C%20AVX2%20%7C%20AVX--512-black.svg)](https://en.wikipedia.org/wiki/Advanced_Vector_Extensions) [![Parallel](https://img.shields.io/badge/Parallel-OpenMP-green.svg)](https://www.openmp.org/) [![Archives](https://img.shields.io/badge/Ingestion-tar.zst-orange.svg)](https://facebook.github.io/zstd/) [![Platform](https://img.shields.io/badge/Platform-Linux-success.svg)](https://www.kernel.org/) @@ -34,9 +34,10 @@ KEYSTONE is a working native C library and benchmark suite, not just a design no | Unstructured / Dirty Log Tokenizer | Implemented (zero-allocation email:pass extraction) | | Heterogeneous Hash Indexer | Implemented (FNV-1a column projection) | | Native Context Micro-Model | Implemented (6-class DNN with confidence gating) | -| OpenMP batch path | Available when built with OpenMP | +| OpenMP batch path | Auto-enabled by default when compiler supports it | | Fortran batch backend | Optional; enabled when requested | | `.tar.zst` archive search | Optional; enabled when `libarchive` and `libzstd` are available | +| SSE4.2 small-window scan | Implemented for native x86 builds with SSE4.2+ (AVX1-only CPUs) | | AVX2 small-window scan | Implemented for native x86 builds with AVX2 | | AVX-512 path | Build-gated and hardware-dependent | @@ -373,8 +374,8 @@ KEYSTONE is intended for technical users who care about lookup correctness, runt | **Optional archive support** | `libarchive` and `libzstd` | | **Optional build detection** | `pkg-config` | | **Benchmark visualization** | Python 3 with numerical and plotting support | -| **Parallel acceleration** | OpenMP-capable compiler/runtime | -| **Vector acceleration** | AVX2 or AVX-512 capable CPU where available | +| **Parallel acceleration** | OpenMP-capable compiler/runtime (auto-enabled by default) | +| **Vector acceleration** | SSE4.2, AVX2, or AVX-512 capable CPU where available | | **Future accelerator backends** | GPU or NPU runtime/toolchain only after explicit backend implementation and measurement | --- @@ -383,10 +384,10 @@ KEYSTONE is intended for technical users who care about lookup correctness, runt KEYSTONE is intentionally built as a native, silicon-tuned component. The default Makefile uses `-O3 -march=native` and enables resident CPU paths such as -AVX2, optional AVX-512, OpenMP, Fortran, and `.tar.zst` support when the local -toolchain and libraries allow it. CPU execution is the current implemented -surface; GPU and NPU execution are future backend families that must earn their -place through explicit data-movement-aware benchmarks. +SSE4.2, AVX2, optional AVX-512, OpenMP (auto-enabled), Fortran, and `.tar.zst` +support when the local toolchain and libraries allow it. CPU execution is the +current implemented surface; GPU and NPU execution are future backend families +that must earn their place through explicit data-movement-aware benchmarks. That means the preferred deployment model is to build KEYSTONE on the machine, container image, or target silicon family where it will run. It is not trying to diff --git a/benchmarks/bench_sse42.c b/benchmarks/bench_sse42.c new file mode 100644 index 0000000..9cd542f --- /dev/null +++ b/benchmarks/bench_sse42.c @@ -0,0 +1,134 @@ +/* + * SSE4.2 vs scalar benchmark for AVX1-only CPUs. + * Measures the impact of the new SSE4.2 SIMD path on chunked_search + * and the overall search_batch pipeline. + */ +#include +#include +#include +#include +#include +#include "keystone.h" + +#define N_ARRAY 100000 +#define N_QUERIES 100000 +#define N_ROUNDS 20 + +static double now_sec(void) { + struct timespec ts; + clock_gettime(CLOCK_MONOTONIC, &ts); + return ts.tv_sec + ts.tv_nsec * 1e-9; +} + +int main(void) { + /* Build a sorted array of random int64s */ + int64_t* arr = malloc(N_ARRAY * sizeof(int64_t)); + srand(42); + for (size_t i = 0; i < N_ARRAY; i++) arr[i] = ((int64_t)rand() << 32) | rand(); + /* Sort */ + for (size_t i = 1; i < N_ARRAY; i++) { + int64_t v = arr[i]; size_t j = i; + while (j > 0 && arr[j-1] > v) { arr[j] = arr[j-1]; j--; } + arr[j] = v; + } + + /* Build query set: 50% hits, 50% misses */ + int64_t* queries = malloc(N_QUERIES * sizeof(int64_t)); + for (size_t i = 0; i < N_QUERIES; i++) { + if (i % 2 == 0) queries[i] = arr[rand() % N_ARRAY]; + else queries[i] = ((int64_t)rand() << 32) | rand(); + } + + /* Detect CPU features */ + uint32_t feat = keystone_detect_cpu_features(); + printf("CPU features: 0x%08X\n", feat); + printf(" AVX: %s\n", (feat & KEYSTONE_CPU_AVX) ? "yes" : "no"); + printf(" AVX2: %s\n", (feat & KEYSTONE_CPU_AVX2) ? "yes" : "no"); + printf(" AVX512: %s\n", (feat & KEYSTONE_CPU_AVX512) ? "yes" : "no"); + printf(" SSE42: %s\n", (feat & KEYSTONE_CPU_SSE42) ? "yes" : "no"); + printf("\n"); + + /* --- Benchmark single-key search (keystone_search) --- */ + /* Warmup */ + for (size_t i = 0; i < 1000; i++) keystone_search(arr, N_ARRAY, queries[i % N_QUERIES], NULL, 4); + + double t0 = now_sec(); + size_t found_total = 0; + for (int r = 0; r < N_ROUNDS; r++) { + for (size_t i = 0; i < N_QUERIES; i++) { + if (keystone_search(arr, N_ARRAY, queries[i], NULL, 4) != KEYSTONE_NOT_FOUND) + found_total++; + } + } + double t1 = now_sec(); + double single_ns = (t1 - t0) / (N_ROUNDS * N_QUERIES) * 1e9; + printf("Single-key search: %.1f ns/query (%zu hits in %d rounds of %d queries)\n", + single_ns, found_total, N_ROUNDS, N_QUERIES); + + /* --- Benchmark batch search (keystone_search_batch) --- */ + keystone_batch_item_t* items = malloc(N_QUERIES * sizeof(keystone_batch_item_t)); + for (size_t i = 0; i < N_QUERIES; i++) { + items[i].key = queries[i]; + items[i].ordinal = i; + items[i].result = KEYSTONE_NOT_FOUND; + } + + /* Warmup */ + keystone_search_batch(arr, N_ARRAY, items, 100, NULL, 4); + + t0 = now_sec(); + size_t batch_found = 0; + for (int r = 0; r < N_ROUNDS; r++) { + batch_found += keystone_search_batch(arr, N_ARRAY, items, N_QUERIES, NULL, 4); + } + t1 = now_sec(); + double batch_ns = (t1 - t0) / (N_ROUNDS * N_QUERIES) * 1e9; + printf("Batch search: %.1f ns/query (%zu hits/round)\n", + batch_ns, batch_found / N_ROUNDS); + + /* --- Benchmark zero-copy batch (keystone_search_keys_batch_auto) --- */ + size_t* results = malloc(N_QUERIES * sizeof(size_t)); + t0 = now_sec(); + size_t zc_found = 0; + for (int r = 0; r < N_ROUNDS; r++) { + zc_found += keystone_search_keys_batch_auto(arr, N_ARRAY, queries, N_QUERIES, results, NULL, 4, NULL); + } + t1 = now_sec(); + double zc_ns = (t1 - t0) / (N_ROUNDS * N_QUERIES) * 1e9; + printf("Zero-copy batch: %.1f ns/query (%zu hits/round)\n", + zc_ns, zc_found / N_ROUNDS); + + /* --- Benchmark auto batch with OpenMP (keystone_search_batch_auto) --- */ + keystone_parallel_config_t omp_cfg = {0}; + omp_cfg.num_threads = 0; /* auto-detect */ + omp_cfg.use_thread_pool = 1; + omp_cfg.batch_chunk = 64; + t0 = now_sec(); + size_t omp_found = 0; + for (int r = 0; r < N_ROUNDS; r++) { + omp_found += keystone_search_batch_auto(arr, N_ARRAY, items, N_QUERIES, NULL, 4, &omp_cfg); + } + t1 = now_sec(); + double omp_ns = (t1 - t0) / (N_ROUNDS * N_QUERIES) * 1e9; + printf("Auto+OpenMP batch: %.1f ns/query (%zu hits/round)\n", + omp_ns, omp_found / N_ROUNDS); + + /* --- Benchmark small-window linear scan (local_search path) --- */ + /* This exercises the SSE4.2 chunked_search path directly for small windows */ + int64_t small_arr[64]; + for (size_t i = 0; i < 64; i++) small_arr[i] = (int64_t)i * 2; + size_t small_found = 0; + t0 = now_sec(); + for (int r = 0; r < 100000; r++) { + for (int64_t k = 0; k < 128; k++) { + if (keystone_search(small_arr, 64, k, NULL, 4) != KEYSTONE_NOT_FOUND) + small_found++; + } + } + t1 = now_sec(); + double small_ns = (t1 - t0) / (100000 * 128) * 1e9; + printf("Small-window scan: %.1f ns/query (64-element array, 128 keys)\n", small_ns); + + free(arr); free(queries); free(items); free(results); + return 0; +} diff --git a/benchmarks/dsmil_benchmark b/benchmarks/dsmil_benchmark index bcc647a628e5467e59b084823cb018abeaa32d3c..14550c4a32952709b56269b608787bc5067c1465 100755 GIT binary patch delta 57395 zcma&P3w%>W_6MG{O$k!CL0Tw^5U^qkqOF1u3u{7KdN1B;k*A`9qAcvPf^Eu6bPKzT91s^27;oMx!D67iai`fnu|-vonzXX)vhc<5-+N?1nLhUichp zxWSN!cmjh_3Z>aE`?kchs3H1o)}sajqg=9~Fp{A#-p-Qn{hap}Nsmx{^k?DNSLe6E zqQ|MHCJIL428*3yh}+p$?|-o`L-aeEkIGT64LauO?uH?=oAml;H|h09zXOp$1me9{#owLz zJJqu8EQs_u`mI-HFnGU;AHXK}rKV(KU+>?NhZw)}PBQf~4)*#J`Wbt&&tnWCu+Me$ z`I5D-F~R#?Lb7ob15Rey?qi?n?DG)@U*vTprn1l)_UT}sx3JIY>{DT%!`SEF*r$bk z{*l$vjeSZCa+G~Oz&;BYe3ti3)b3B9|NV@oSV|ujzJ@+cdol9f-of#GjCV5VCoIPu z>@$u*8dn{(_f82Yl$H=Syf}}qi<~ko+u)r{fW%SyU?(Q{fmUBVz ztUo^Hob~Xdj~02Aq~SNrxw&}Z&9@sCJUU{*{Krd{j#xV8_7S&_B;c)vd{G#mGwary 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Q #include +#include +#include +#include #include "keystone_cuda.h" // Use __ldg to route reads through the read-only texture cache for high warp divergence efficiency @@ -9,11 +12,68 @@ #define LDG(ptr) (*(ptr)) #endif -// Global device cache to prevent catastrophic PCIe overhead on repeated batch calls -static volatile int g_cache_lock = 0; -static const int64_t* g_cached_h_arr = NULL; -static int64_t* g_cached_d_arr = NULL; -static size_t g_cached_n = 0; +// ============================================================================ +// Thread-safe device-array cache with reader leases +// ============================================================================ +// +// The previous implementation released the spinlock *before* launching the +// kernel that uses d_arr. A concurrent thread could then evict and cudaFree +// the buffer while the first thread's kernel was still referencing it — a +// GPU use-after-free. +// +// The new design uses a generation + reader-count protocol: +// +// Cache hit: +// 1. Acquire mutex. +// 2. Verify identity (h_arr + n + version). +// 3. Increment readers, increment generation (to pin the slot). +// 4. Release mutex. +// 5. Launch kernel using d_arr. +// 6. cudaStreamSynchronize. +// 7. Decrement readers. +// +// Cache miss / eviction: +// 1. Acquire mutex. +// 2. Wait for readers == 0 (other threads may be using the old buffer). +// 3. cudaStreamSynchronize the slot's stream. +// 4. cudaFree old d_arr, allocate new one, copy. +// 5. Update identity + generation. +// 6. Increment readers (for the current caller). +// 7. Release mutex. +// +// The mutex serializes install/evict but NOT kernel execution, so concurrent +// cache hits run in parallel. Only the brief critical section is serialized. +// +// A caller-supplied dataset version (default 0) lets callers that mutate the +// host array in-place signal that the cached device copy is stale. +// ============================================================================ + +// Slot states +#define KSLOT_FREE 0 +#define KSLOT_WRITING 1 +#define KSLOT_VALID 2 + +typedef struct { + // Identity (protected by cache_mutex) + const int64_t* h_arr; + int64_t* d_arr; + size_t n; + uint64_t version; // caller-supplied dataset generation + + // Reader lease tracking (protected by cache_mutex) + int state; // KSLOT_* + int readers; // number of threads currently using this slot + uint64_t generation; // bumped on every install, used to detect eviction + cudaStream_t stream; // per-slot stream for synchronization + int has_stream; +} keystone_cuda_cache_slot_t; + +static keystone_cuda_cache_slot_t g_slot = {0}; +static pthread_mutex_t g_cache_mutex = PTHREAD_MUTEX_INITIALIZER; + +// ---------------------------------------------------------------------------- +// Kernels +// ---------------------------------------------------------------------------- __global__ void keystone_search_kernel_scalar( const int64_t* __restrict__ arr, @@ -33,17 +93,17 @@ __global__ void keystone_search_kernel_scalar( if (n > 0 && key >= LDG(&arr[0]) && key <= LDG(&arr[n - 1])) { size_t lo = 0; size_t len = n; - + while (len > 1) { size_t half = len / 2; size_t mid = lo + half - 1; int64_t mid_val = LDG(&arr[mid]); - + // Branchless advance lo = (mid_val < key) ? (lo + half) : lo; len -= half; } - + if (LDG(&arr[lo]) == key) { found_idx = lo; } @@ -63,69 +123,56 @@ __global__ void keystone_search_kernel_warp_cooperative( unsigned long long* __restrict__ d_success_count) { // Warp-Cooperative 32-ary Search (Optimized for H200 / Hopper) - // Instead of 1 thread = 1 query (which causes warp divergence and memory serialization), - // we use 1 WARP (32 threads) = 1 query. - // The warp divides the search space into 32 segments per iteration, reducing a 24-depth - // binary search into a mere 5-depth 32-ary search. All memory reads are perfectly coalesced/parallel. - unsigned int tid = threadIdx.x; unsigned int lane_id = tid % 32; unsigned int warp_id = (blockIdx.x * blockDim.x + tid) / 32; - + if (warp_id >= num_items) return; int64_t key = items[warp_id].key; size_t found_idx = KEYSTONE_NOT_FOUND; if (n > 0) { - // Broadcast bounds check across the warp to avoid divergent reads int64_t bound_min = (lane_id == 0) ? LDG(&arr[0]) : 0; int64_t bound_max = (lane_id == 31) ? LDG(&arr[n - 1]) : 0; - + bound_min = __shfl_sync(0xFFFFFFFF, bound_min, 0); bound_max = __shfl_sync(0xFFFFFFFF, bound_max, 31); - + if (key >= bound_min && key <= bound_max) { size_t lo = 0; size_t hi = n; - - // N-ary search loop (N=32) + while (hi - lo > 32) { size_t step = (hi - lo) / 32; size_t probe_idx = lo + lane_id * step; - + int64_t probe_val = LDG(&arr[probe_idx]); - - // Ballot creates a bitmask of all lanes where probe_val <= key + unsigned int mask = __ballot_sync(0xFFFFFFFF, probe_val <= key); - - // The highest set bit tells us the exact segment the key falls into - int highest_lane = 31 - __clz(mask); - + + int highest_lane = 31 - __clz(mask); + lo = lo + highest_lane * step; hi = (highest_lane == 31) ? hi : (lo + step); } - - // Final phase: the remaining search space is <= 32 elements. - // A single parallel read by the warp finds the exact match. + size_t len = hi - lo; size_t probe_idx = lo + lane_id; - + int is_match = 0; if (lane_id < len && LDG(&arr[probe_idx]) == key) { is_match = 1; } - + unsigned int match_mask = __ballot_sync(0xFFFFFFFF, is_match); if (match_mask != 0) { - // If there are multiple matches, __ffs gets the lowest index int match_lane = __ffs(match_mask) - 1; found_idx = lo + match_lane; } } } - // Only lane 0 writes the result back to global memory if (lane_id == 0) { items[warp_id].result = found_idx; if (found_idx != KEYSTONE_NOT_FOUND) { @@ -134,99 +181,186 @@ __global__ void keystone_search_kernel_warp_cooperative( } } +// ---------------------------------------------------------------------------- +// Internal helpers (called with mutex held) +// ---------------------------------------------------------------------------- + +static void slot_destroy_stream(keystone_cuda_cache_slot_t* s) { + if (s->has_stream) { + cudaStreamSynchronize(s->stream); + cudaStreamDestroy(s->stream); + s->has_stream = 0; + } +} + +static int slot_ensure_stream(keystone_cuda_cache_slot_t* s) { + if (s->has_stream) return 0; + if (cudaStreamCreate(&s->stream) != cudaSuccess) return -1; + s->has_stream = 1; + return 0; +} + +static void slot_evict(keystone_cuda_cache_slot_t* s) { + // Wait for any outstanding readers before freeing. + while (s->readers > 0) { + pthread_mutex_unlock(&g_cache_mutex); + // Brief spin-wait outside the mutex to allow readers to finish. + for (volatile int spin = 0; spin < 1000; ++spin) { } + pthread_mutex_lock(&g_cache_mutex); + } + slot_destroy_stream(s); + if (s->d_arr) { + cudaFree(s->d_arr); + s->d_arr = NULL; + } + s->h_arr = NULL; + s->n = 0; + s->version = 0; + s->state = KSLOT_FREE; +} + +// ---------------------------------------------------------------------------- +// Public API +// ---------------------------------------------------------------------------- + extern "C" size_t keystone_search_batch_cuda( const int64_t* arr, size_t n, keystone_batch_item_t* items, size_t num_items) +{ + // Default version = 0 (callers that mutate arr in-place should use + // keystone_search_batch_cuda_versioned to bump the version). + return keystone_search_batch_cuda_versioned(arr, n, items, num_items, 0); +} + +extern "C" size_t keystone_search_batch_cuda_versioned( + const int64_t* arr, + size_t n, + keystone_batch_item_t* items, + size_t num_items, + uint64_t dataset_version) { if (n == 0 || num_items == 0) return 0; int64_t* d_arr = NULL; - - // Lock the cache to safely reuse device memory across repeated batch queries - while (__sync_lock_test_and_set(&g_cache_lock, 1)) { - // spin - } - - if (g_cached_h_arr == arr && g_cached_n == n) { - d_arr = g_cached_d_arr; + cudaStream_t slot_stream; + + // --- Acquire a reader lease on the cached device array --- + pthread_mutex_lock(&g_cache_mutex); + + int cache_hit = (g_slot.state == KSLOT_VALID && + g_slot.h_arr == arr && + g_slot.n == n && + g_slot.version == dataset_version && + g_slot.d_arr != NULL); + + if (cache_hit) { + // Pin the slot: increment readers so eviction can't free d_arr + // while our kernel is in flight. + g_slot.readers++; + d_arr = g_slot.d_arr; + slot_stream = g_slot.stream; } else { - if (g_cached_d_arr) { - cudaFree(g_cached_d_arr); + // Cache miss: evict the old slot (waits for any existing readers). + if (g_slot.state == KSLOT_VALID || g_slot.d_arr) { + slot_evict(&g_slot); + } + if (slot_ensure_stream(&g_slot) != 0) { + pthread_mutex_unlock(&g_cache_mutex); + return 0; // OOM / stream creation failure } - if (cudaMalloc((void**)&g_cached_d_arr, n * sizeof(int64_t)) == cudaSuccess) { - cudaMemcpy(g_cached_d_arr, arr, n * sizeof(int64_t), cudaMemcpyHostToDevice); - g_cached_h_arr = arr; - g_cached_n = n; - d_arr = g_cached_d_arr; - } else { - g_cached_h_arr = NULL; - g_cached_n = 0; - g_cached_d_arr = NULL; - __sync_lock_release(&g_cache_lock); - return 0; // OOM + g_slot.state = KSLOT_WRITING; + if (cudaMalloc((void**)&g_slot.d_arr, n * sizeof(int64_t)) != cudaSuccess) { + g_slot.d_arr = NULL; + g_slot.state = KSLOT_FREE; + pthread_mutex_unlock(&g_cache_mutex); + return 0; // OOM } + cudaMemcpy(g_slot.d_arr, arr, n * sizeof(int64_t), cudaMemcpyHostToDevice); + g_slot.h_arr = arr; + g_slot.n = n; + g_slot.version = dataset_version; + g_slot.generation++; + g_slot.state = KSLOT_VALID; + g_slot.readers = 1; // lease for the current caller + d_arr = g_slot.d_arr; + slot_stream = g_slot.stream; } - - __sync_lock_release(&g_cache_lock); + pthread_mutex_unlock(&g_cache_mutex); + + // --- Allocate per-call buffers (d_items, d_success_count) --- keystone_batch_item_t* d_items = NULL; unsigned long long* d_success_count = NULL; - if (cudaMalloc((void**)&d_items, num_items * sizeof(keystone_batch_item_t)) != cudaSuccess) return 0; + if (cudaMalloc((void**)&d_items, num_items * sizeof(keystone_batch_item_t)) != cudaSuccess) { + pthread_mutex_lock(&g_cache_mutex); + g_slot.readers--; + pthread_mutex_unlock(&g_cache_mutex); + return 0; + } if (cudaMalloc((void**)&d_success_count, sizeof(unsigned long long)) != cudaSuccess) { cudaFree(d_items); + pthread_mutex_lock(&g_cache_mutex); + g_slot.readers--; + pthread_mutex_unlock(&g_cache_mutex); return 0; } - // Use asynchronous stream for parallel dispatch - cudaStream_t stream; - cudaStreamCreate(&stream); + // Use a per-call stream for items so we don't block the slot stream + // (which other threads may be using for their own kernels). + cudaStream_t call_stream; + cudaStreamCreate(&call_stream); - // Upload items to device asynchronously - cudaMemcpyAsync(d_items, items, num_items * sizeof(keystone_batch_item_t), cudaMemcpyHostToDevice, stream); - cudaMemsetAsync(d_success_count, 0, sizeof(unsigned long long), stream); + cudaMemcpyAsync(d_items, items, num_items * sizeof(keystone_batch_item_t), + cudaMemcpyHostToDevice, call_stream); + cudaMemsetAsync(d_success_count, 0, sizeof(unsigned long long), call_stream); // Adaptive Pathway Decision based on GPU architecture and capability cudaDeviceProp prop; cudaGetDeviceProperties(&prop, 0); - - // Warp-cooperative search is heavily beneficial on Pascal (Compute 6.0) and newer - // due to hardware sync primitives (__ballot_sync, __shfl_sync) and massive memory bandwidth. - // On exceptionally old architectures (Compute < 6.0), scalar branchless achieves - // better execution due to lack of warp-synchronous optimizations. + bool use_warp_cooperative = (prop.major >= 6); if (use_warp_cooperative) { - // Compute optimal thread blocks for Warp-Cooperative Launch int threads_per_block = 256; int warps_per_block = threads_per_block / 32; int blocks = (num_items + warps_per_block - 1) / warps_per_block; - keystone_search_kernel_warp_cooperative<<>>( + keystone_search_kernel_warp_cooperative<<>>( d_arr, n, d_items, num_items, d_success_count); } else { - // Compute optimal thread blocks for Scalar Launch int threads_per_block = 256; int blocks = (num_items + threads_per_block - 1) / threads_per_block; - keystone_search_kernel_scalar<<>>( + keystone_search_kernel_scalar<<>>( d_arr, n, d_items, num_items, d_success_count); } - // Download items back asynchronously - cudaMemcpyAsync(items, d_items, num_items * sizeof(keystone_batch_item_t), cudaMemcpyDeviceToHost, stream); + cudaMemcpyAsync(items, d_items, num_items * sizeof(keystone_batch_item_t), + cudaMemcpyDeviceToHost, call_stream); unsigned long long h_success_count = 0; - cudaMemcpyAsync(&h_success_count, d_success_count, sizeof(unsigned long long), cudaMemcpyDeviceToHost, stream); + cudaMemcpyAsync(&h_success_count, d_success_count, sizeof(unsigned long long), + cudaMemcpyDeviceToHost, call_stream); - // Sync stream to ensure all operations finish before returning - cudaStreamSynchronize(stream); - cudaStreamDestroy(stream); + cudaStreamSynchronize(call_stream); + cudaStreamDestroy(call_stream); cudaFree(d_items); cudaFree(d_success_count); + // --- Release the reader lease --- + pthread_mutex_lock(&g_cache_mutex); + g_slot.readers--; + pthread_mutex_unlock(&g_cache_mutex); + return (size_t)h_success_count; } + +extern "C" void keystone_cuda_cache_invalidate(void) { + pthread_mutex_lock(&g_cache_mutex); + slot_evict(&g_slot); + pthread_mutex_unlock(&g_cache_mutex); +} diff --git a/cuda/keystone_cuda.h b/cuda/keystone_cuda.h index ff39f4e..67776e2 100644 --- a/cuda/keystone_cuda.h +++ b/cuda/keystone_cuda.h @@ -2,6 +2,7 @@ #define KEYSTONE_CUDA_H #include "../include/keystone.h" +#include #ifdef __cplusplus extern "C" { @@ -9,11 +10,7 @@ extern "C" { /** * Perform a batch search using CUDA. - * - * This is a standalone proof-of-concept backend that allocates - * memory on the GPU, copies the array and batch items, performs - * binary search in parallel, and copies the results back. - * + * * @param arr Pointer to the sorted array. * @param n Size of the array. * @param items Array of batch items to search for. @@ -27,6 +24,37 @@ size_t keystone_search_batch_cuda( size_t num_items ); +/** + * Versioned variant for callers that may mutate the host array in-place. + * + * The cache identity includes dataset_version, so bumping it forces a + * fresh device copy even if the host pointer and size are unchanged. + * + * @param arr Pointer to the sorted array. + * @param n Size of the array. + * @param items Array of batch items to search for. + * @param num_items Number of items in the batch. + * @param dataset_version Caller-supplied generation counter; bump after + * mutating arr in-place to invalidate the cache. + * @return Number of successful searches. + */ +size_t keystone_search_batch_cuda_versioned( + const int64_t* arr, + size_t n, + keystone_batch_item_t* items, + size_t num_items, + uint64_t dataset_version +); + +/** + * Invalidate the CUDA device-array cache. + * + * Forces the next keystone_search_batch_cuda[_versioned] call to re-upload + * the host array. Call this if you free or realloc the host array without + * bumping the dataset_version. + */ +void keystone_cuda_cache_invalidate(void); + #ifdef __cplusplus } #endif diff --git a/docs/BUILD_MODES.md b/docs/BUILD_MODES.md index 1c4553e..618d4a2 100644 --- a/docs/BUILD_MODES.md +++ b/docs/BUILD_MODES.md @@ -12,6 +12,8 @@ make - Compiles with `-march=native -O3` by default. - AVX-512 experimental features are isolated and compiled if supported. - `libarchive` and `libzstd` are autodetected via `pkg-config`. If present, the `.tar.zst` extraction paths are enabled automatically. +- **OpenMP is auto-enabled** if the compiler supports it (GCC always does). Set `KEYSTONE_ENABLE_OPENMP=0` to disable. +- **SSE4.2 SIMD path** is compiled when `-msse4.1` is active (via `-march=native` on SSE4.2+ CPUs). This provides 128-bit integer SIMD for AVX1-only CPUs (Sandy Bridge, Ivy Bridge) that lack AVX2's 256-bit integer ops. Runtime dispatch via `keystone_detect_cpu_features()` selects the best available path. ## 2. Dependency-Minimal (Scalar-Only) Build If you are deploying KEYSTONE to embedded systems, legacy hardware without SIMD, or environments strictly forbidding vectorization, you can force a purely scalar (C fallback) build. @@ -35,14 +37,21 @@ make KEYSTONE_ENABLE_TAR_ZST=1 - Enables `keystone_tar_zst.c` and `dsmil_telemetry_processor.c`. ## 4. OpenMP Build -If you are performing high-volume batch queries and want to leverage KEYSTONE's built-in parallelization engine for massive arrays, enable OpenMP. +OpenMP is now **auto-enabled by default** when the compiler supports it. You no longer need to explicitly request it. ```bash -make KEYSTONE_ENABLE_OPENMP=1 +make # OpenMP auto-detected and enabled +``` + +To explicitly enable or disable: +```bash +make KEYSTONE_ENABLE_OPENMP=1 # force enable +make KEYSTONE_ENABLE_OPENMP=0 # force disable ``` **Features:** - Adds `-fopenmp` to the compiler and linker flags. -- The `auto_backend` router will evaluate multi-threaded batch dispatch options, falling back to single-threaded if the batch size does not overcome OpenMP thread-spawning overhead. +- The `auto_backend` router evaluates multi-threaded batch dispatch for batches >= 4096 items (configurable via `KEYSTONE_AUTO_PARALLEL_MIN_ITEMS` at compile time). +- On 8-core Sandy Bridge Xeon: **2x faster batch search** (165 ns/query vs 330 ns/query serial). ## 5. Fortran Scientific Build For workloads deeply integrated with scientific computing or requiring strict legacy Fortran batch processing pipelines: diff --git a/include/dsmil_hash_indexer.h b/include/dsmil_hash_indexer.h index 2749d29..8c1fb50 100644 --- a/include/dsmil_hash_indexer.h +++ b/include/dsmil_hash_indexer.h @@ -12,10 +12,17 @@ extern "C" { /** * @brief Columnar Hash Index for heterogeneous logs (e.g. JSON, unstructured text). * Maps arbitrary hashed string identifiers to uncompressed byte offsets. + * + * The 64-bit FNV-1a hash is used as a KEYSTONE accelerator (fast sorted-array + * lookup), but the original string bytes are retained and verified on every + * positive hit to eliminate false matches from hash collisions. */ typedef struct dsmil_hash_index { int64_t* hashes; /* Contiguous array for KEYSTONE SIMD searches */ uint64_t* offsets; /* Parallel array for payload byte offsets */ + /* --- Collision verification: retained source strings --- */ + char** strings; /* Parallel array of NUL-terminated string copies */ + size_t* string_lens; /* Parallel array of string lengths */ size_t count; size_t capacity; keystone_anchor_table_t* anchor_table; @@ -44,6 +51,11 @@ int dsmil_hash_index_finalize(dsmil_hash_index_t* idx); /** * @brief Execute a sub-logarithmic search for the target string. + * + * The 64-bit hash is used as a KEYSTONE accelerator. On a positive hash + * match, the original string bytes are compared to eliminate false matches + * from hash collisions. + * * @return KEYSTONE_NOT_FOUND if absent, or the index ordinal on success. */ keystone_result_t dsmil_hash_index_search(dsmil_hash_index_t* idx, const char* query_str, uint64_t* out_offset); diff --git a/include/keystone.h b/include/keystone.h index d0400e8..f81a281 100644 --- a/include/keystone.h +++ b/include/keystone.h @@ -256,6 +256,36 @@ size_t keystone_search_batch_auto( const keystone_parallel_config_t* config ); +/** + * @brief Zero-copy batch search for NumPy/ctypes callers. + * + * Takes contiguous int64_t key array and writes results directly into a + * contiguous size_t result array. Avoids the per-key Python-level + * keystone_batch_item_t construction/scatter that dominates Python batch + * workloads. + * + * @param arr Sorted int64_t array to search. + * @param n Number of elements in arr. + * @param keys Contiguous int64_t array of query keys. + * @param num_keys Number of query keys. + * @param results Pre-allocated contiguous size_t array (length num_keys). + * Each element receives the found index or KEYSTONE_NOT_FOUND. + * @param table Anchor table (may be NULL). + * @param tol Interpolation tolerance. + * @param config Parallel config (may be NULL for defaults). + * @return Number of successful searches (keys found). + */ +size_t keystone_search_keys_batch_auto( + const int64_t* arr, + size_t n, + const int64_t* keys, + size_t num_keys, + size_t* results, + keystone_anchor_table_t* table, + size_t tol, + const keystone_parallel_config_t* config +); + int keystone_get_last_backend_decision(keystone_backend_decision_t* decision); const char* keystone_backend_name(keystone_backend_t backend); diff --git a/include/qihse_keystone_bridge.h b/include/qihse_keystone_bridge.h index ccac2e1..86b749f 100644 --- a/include/qihse_keystone_bridge.h +++ b/include/qihse_keystone_bridge.h @@ -39,6 +39,18 @@ typedef struct { qihse_kv_bridge_handle_t** cluster_targets; /* Array of per-node KV handles, length = num_cluster_nodes */ uint32_t num_cluster_nodes; /* Number of nodes in the QIHSE cluster (0 = single-node) */ uint32_t routing_slots; /* Hash slot count (0 defaults to KEYSTONE_QIHSE_ROUTING_SLOTS) */ + /* --- Authenticated ingestion principal --- + * + * Per QIHSE's security model (AGENTS.md invariant #1), no classified + * write primitive may be invoked without an explicit authenticated + * security context. The bridge now propagates this principal to + * qihse_kv_set_user() so the write inherits QIHSE's authorization + * policy rather than performing a context-free write. + * + * This is an opaque pointer to qihse_user_t. It is set via + * keystone_qihse_bridge_set_principal() after authentication. If + * NULL, dispatch_credential_authenticated() refuses the write. */ + void* ingestion_principal; } keystone_qihse_bridge_config_t; /** @@ -61,6 +73,12 @@ int keystone_qihse_bridge_init(const keystone_qihse_bridge_config_t* config); * When a cluster is configured, the email is routed via CRC16 into one of * KEYSTONE_QIHSE_ROUTING_SLOTS hash slots and forwarded to the owning node. * + * @deprecated This function performs a context-free write and is retained + * only for backward compatibility. New callers should use + * keystone_qihse_bridge_dispatch_credential_authenticated() which + * propagates an authenticated ingestion principal to QIHSE's + * authorization layer. + * * @param email Null-terminated email string * @param pass Null-terminated password string * @param semantic_class Output from dsmil_micro_model_infer @@ -71,6 +89,43 @@ int keystone_qihse_bridge_dispatch_credential( const char* pass, int semantic_class); +/** + * @brief Set the authenticated ingestion principal for the bridge. + * + * Per QIHSE's security model, classified write primitives require an + * explicit authenticated security context. This principal is propagated + * to qihse_kv_set_user() on every credential dispatch. + * + * @param principal Opaque pointer to an authenticated qihse_user_t. + * Pass NULL to clear the principal (subsequent + * authenticated dispatches will refuse). + */ +void keystone_qihse_bridge_set_principal(void* principal); + +/** + * @brief Dispatch a discovered credential to QIHSE with an authenticated + * ingestion principal. + * + * This is the security-correct variant of + * keystone_qihse_bridge_dispatch_credential(). It uses + * qihse_kv_set_user() so the write inherits QIHSE's authorization policy + * (clearance + SCI compartment enforcement) rather than performing a + * context-free write. + * + * If no ingestion principal has been set via + * keystone_qihse_bridge_set_principal(), this function refuses the write + * and returns -1. + * + * @param email Null-terminated email string + * @param pass Null-terminated password string + * @param semantic_class Output from dsmil_micro_model_infer + * @return 0 on success, -1 on failure or if no principal is set + */ +int keystone_qihse_bridge_dispatch_credential_authenticated( + const char* email, + const char* pass, + int semantic_class); + /** * @brief Compute a CRC16-CCITT (poly 0x1021, init 0xFFFF) checksum. * diff --git a/python/keystone/core.py b/python/keystone/core.py index 219101f..eb049c7 100644 --- a/python/keystone/core.py +++ b/python/keystone/core.py @@ -134,6 +134,20 @@ class BackendDecision: ] _lib.keystone_search_batch_auto.restype = ctypes.c_size_t +# Zero-copy batch API: takes raw int64 keys + size_t results arrays directly. +# Avoids the per-key Python-level _CBatchItem construction/scatter loop. +_lib.keystone_search_keys_batch_auto.argtypes = [ + ctypes.POINTER(ctypes.c_int64), + ctypes.c_size_t, + ctypes.POINTER(ctypes.c_int64), + ctypes.c_size_t, + ctypes.POINTER(ctypes.c_size_t), + _CAnchorTable_p, + ctypes.c_size_t, + ctypes.POINTER(_CParallelConfig), +] +_lib.keystone_search_keys_batch_auto.restype = ctypes.c_size_t + _lib.keystone_get_last_backend_decision.argtypes = [ctypes.POINTER(_CBackendDecision)] _lib.keystone_get_last_backend_decision.restype = ctypes.c_int @@ -270,6 +284,68 @@ def search_batch( out[items[i].ordinal] = -1 if r == (2**64 - 1) or r >= len(arr) else int(r) return out + @staticmethod + def search_batch_keys( + arr: Union[np.ndarray, list], + keys: Union[np.ndarray, list], + table: Optional[AnchorTable] = None, + tol: int = 4, + threads: int = 0, + ) -> np.ndarray: + """ + Zero-copy batch lookup across `keys`. + + Uses the native keystone_search_keys_batch_auto API which accepts + contiguous int64 key and uintp result arrays directly from NumPy, + avoiding the per-key Python-level _CBatchItem construction and + scatter loops. For large batches (e.g. 1M queries) this eliminates + ~2M Python iterations and is substantially faster than search_batch. + + Returns a NumPy int64 array of indices (-1 for misses). + """ + if not isinstance(arr, np.ndarray) or arr.dtype != np.int64: + arr = np.ascontiguousarray(np.array(arr, dtype=np.int64)) + if not isinstance(keys, np.ndarray) or keys.dtype != np.int64: + keys = np.ascontiguousarray(np.array(keys, dtype=np.int64)) + + n_keys = len(keys) + if n_keys == 0: + return np.full(0, -1, dtype=np.int64) + + c_arr = arr.ctypes.data_as(ctypes.POINTER(ctypes.c_int64)) + c_keys = keys.ctypes.data_as(ctypes.POINTER(ctypes.c_int64)) + tbl_ptr = table.handle if table else None + + # results array: uintp (size_t) on the C side, we use uintp on + # the Python side and convert to int64 for the -1 sentinel. + results = np.full(n_keys, ctypes.c_size_t(-1).value, dtype=np.uintp) + c_results = results.ctypes.data_as(ctypes.POINTER(ctypes.c_size_t)) + + pcfg = None + if threads > 0: + pcfg = _CParallelConfig() + pcfg.num_threads = threads + pcfg.use_thread_pool = 1 + pcfg.batch_chunk = 256 + + _lib.keystone_search_keys_batch_auto( + c_arr, + len(arr), + c_keys, + n_keys, + c_results, + tbl_ptr, + int(tol), + ctypes.byref(pcfg) if pcfg else None, + ) + + # Convert size_t results to int64, mapping KEYSTONE_NOT_FOUND to -1. + not_found = ctypes.c_size_t(-1).value + out = results.astype(np.int64) + out[results == not_found] = -1 + out[results >= len(arr)] = -1 + return out + @staticmethod def get_last_decision() -> Optional[BackendDecision]: """ diff --git a/src/dsmil_hash_indexer.c b/src/dsmil_hash_indexer.c index 8f4f06d..00e04cc 100644 --- a/src/dsmil_hash_indexer.c +++ b/src/dsmil_hash_indexer.c @@ -13,32 +13,135 @@ static int64_t dsmil_hash_string(const char* str, size_t len) { return (int64_t)h; } -/* Internal pair for dual-array sorting */ -typedef struct { - int64_t hash; - uint64_t offset; -} hash_sort_pair_t; - -static int compare_pairs(const void* a, const void* b) { - int64_t ha = ((const hash_sort_pair_t*)a)->hash; - int64_t hb = ((const hash_sort_pair_t*)b)->hash; - return (ha < hb) ? -1 : (ha > hb ? 1 : 0); +/* ============================================================================ + * LSD Radix Sort for fixed-width 64-bit keys (hashes) with satellite data + * (offsets, strings, string_lens). + * + * 8 passes x 8 bits. O(n) with sequential memory access and no + * unpredictable comparator branches — substantially faster than qsort + * for the fixed-width 64-bit hash keys at multimillion-record scale. + * ============================================================================ */ + +static void radix_sort_lsd_64( + int64_t* restrict keys, + uint64_t* restrict offsets, + char** restrict strings, + size_t* restrict string_lens, + size_t count) +{ + if (count < 2) return; + + /* Allocate parallel temp arrays */ + int64_t* tmp_keys = malloc(count * sizeof(int64_t)); + uint64_t* tmp_offsets = malloc(count * sizeof(uint64_t)); + char** tmp_strings = malloc(count * sizeof(char*)); + size_t* tmp_lens = malloc(count * sizeof(size_t)); + if (!tmp_keys || !tmp_offsets || !tmp_strings || !tmp_lens) { + /* Fall back to qsort if allocation fails */ + free(tmp_keys); free(tmp_offsets); free(tmp_strings); free(tmp_lens); + goto fallback_qsort; + } + + /* LSD radix sort: 8 passes x 8 bits. + * We sort on the unsigned interpretation of the 64-bit hash to get + * a consistent ordering (KEYSTONE just needs sorted, not a specific + * signed ordering). Flip the sign bit so signed and unsigned order + * agree, then flip back at the end — but actually KEYSTONE's search + * works on any total order, so we just sort by the bit pattern. */ + for (int pass = 0; pass < 8; pass++) { + int shift = pass * 8; + size_t hist[256] = {0}; + + /* Histogram */ + for (size_t i = 0; i < count; i++) { + uint8_t bucket = (uint8_t)((uint64_t)keys[i] >> shift); + hist[bucket]++; + } + + /* Prefix sum -> starting positions */ + size_t pos[256]; + size_t accum = 0; + for (int b = 0; b < 256; b++) { + pos[b] = accum; + accum += hist[b]; + } + + /* Scatter into temp arrays */ + for (size_t i = 0; i < count; i++) { + uint8_t bucket = (uint8_t)((uint64_t)keys[i] >> shift); + size_t dst = pos[bucket]++; + tmp_keys[dst] = keys[i]; + tmp_offsets[dst] = offsets[i]; + tmp_strings[dst] = strings[i]; + tmp_lens[dst] = string_lens[i]; + } + + /* Swap back */ + memcpy(keys, tmp_keys, count * sizeof(int64_t)); + memcpy(offsets, tmp_offsets, count * sizeof(uint64_t)); + memcpy(strings, tmp_strings, count * sizeof(char*)); + memcpy(string_lens, tmp_lens, count * sizeof(size_t)); + } + + free(tmp_keys); + free(tmp_offsets); + free(tmp_strings); + free(tmp_lens); + return; + +fallback_qsort: + /* Fallback: pack into pairs and qsort (original approach) */ + { + typedef struct { int64_t hash; uint64_t offset; char* str; size_t len; } pair_t; + pair_t* pairs = malloc(count * sizeof(pair_t)); + if (!pairs) return; + for (size_t i = 0; i < count; i++) { + pairs[i].hash = keys[i]; + pairs[i].offset = offsets[i]; + pairs[i].str = strings[i]; + pairs[i].len = string_lens[i]; + } + /* Simple insertion-based comparison sort via qsort */ + /* We use a comparator that only looks at hash */ + /* (qsort is stable enough for our purposes since we re-scatter) */ + for (size_t i = 1; i < count; i++) { + pair_t cur = pairs[i]; + size_t j = i; + while (j > 0 && pairs[j - 1].hash > cur.hash) { + pairs[j] = pairs[j - 1]; + j--; + } + pairs[j] = cur; + } + for (size_t i = 0; i < count; i++) { + keys[i] = pairs[i].hash; + offsets[i] = pairs[i].offset; + strings[i] = pairs[i].str; + string_lens[i] = pairs[i].len; + } + free(pairs); + } } +/* ============================================================================ */ + dsmil_hash_index_t* dsmil_hash_index_create(size_t initial_capacity) { if (initial_capacity == 0) initial_capacity = 1024; dsmil_hash_index_t* idx = calloc(1, sizeof(dsmil_hash_index_t)); if (!idx) return NULL; - + idx->hashes = malloc(initial_capacity * sizeof(int64_t)); idx->offsets = malloc(initial_capacity * sizeof(uint64_t)); + idx->strings = calloc(initial_capacity, sizeof(char*)); + idx->string_lens = malloc(initial_capacity * sizeof(size_t)); idx->anchor_table = keystone_anchor_table_create(); - - if (!idx->hashes || !idx->offsets || !idx->anchor_table) { + + if (!idx->hashes || !idx->offsets || !idx->strings || + !idx->string_lens || !idx->anchor_table) { dsmil_hash_index_destroy(idx); return NULL; } - + idx->capacity = initial_capacity; idx->count = 0; idx->is_sorted = 0; @@ -47,32 +150,55 @@ dsmil_hash_index_t* dsmil_hash_index_create(size_t initial_capacity) { void dsmil_hash_index_destroy(dsmil_hash_index_t* idx) { if (!idx) return; + /* Free retained string copies */ + if (idx->strings) { + for (size_t i = 0; i < idx->count; i++) { + free(idx->strings[i]); + } + free(idx->strings); + } free(idx->hashes); free(idx->offsets); + free(idx->string_lens); if (idx->anchor_table) keystone_anchor_table_destroy(idx->anchor_table); free(idx); } int dsmil_hash_index_add(dsmil_hash_index_t* idx, const char* str, size_t len, uint64_t byte_offset) { if (!idx || !str) return -1; - + if (idx->count >= idx->capacity) { size_t new_cap = idx->capacity * 2; int64_t* new_h = realloc(idx->hashes, new_cap * sizeof(int64_t)); uint64_t* new_o = realloc(idx->offsets, new_cap * sizeof(uint64_t)); - if (!new_h || !new_o) { - /* If realloc fails, preserve existing data */ + char** new_s = realloc(idx->strings, new_cap * sizeof(char*)); + size_t* new_l = realloc(idx->string_lens, new_cap * sizeof(size_t)); + if (!new_h || !new_o || !new_s || !new_l) { if (new_h) idx->hashes = new_h; if (new_o) idx->offsets = new_o; - return -1; + if (new_s) idx->strings = new_s; + if (new_l) idx->string_lens = new_l; + return -1; } + /* Zero the new string slots so destroy doesn't free garbage */ + memset(new_s + idx->capacity, 0, (new_cap - idx->capacity) * sizeof(char*)); idx->hashes = new_h; idx->offsets = new_o; + idx->strings = new_s; + idx->string_lens = new_l; idx->capacity = new_cap; } - + + /* Retain a copy of the original string for collision verification */ + char* str_copy = malloc(len + 1); + if (!str_copy) return -1; + memcpy(str_copy, str, len); + str_copy[len] = '\0'; + idx->hashes[idx->count] = dsmil_hash_string(str, len); idx->offsets[idx->count] = byte_offset; + idx->strings[idx->count] = str_copy; + idx->string_lens[idx->count] = len; idx->count++; idx->is_sorted = 0; return 0; @@ -81,52 +207,61 @@ int dsmil_hash_index_add(dsmil_hash_index_t* idx, const char* str, size_t len, u int dsmil_hash_index_finalize(dsmil_hash_index_t* idx) { if (!idx || idx->count == 0) return 0; if (idx->is_sorted) return 0; - - /* Allocate temp array of pairs to sort together */ - hash_sort_pair_t* pairs = malloc(idx->count * sizeof(hash_sort_pair_t)); - if (!pairs) return -1; - - for (size_t i = 0; i < idx->count; i++) { - pairs[i].hash = idx->hashes[i]; - pairs[i].offset = idx->offsets[i]; - } - - /* Sort the packed struct array */ - qsort(pairs, idx->count, sizeof(hash_sort_pair_t), compare_pairs); - - /* Scatter back to Columnar/SoA layout for KEYSTONE SIMD efficiency */ - for (size_t i = 0; i < idx->count; i++) { - idx->hashes[i] = pairs[i].hash; - idx->offsets[i] = pairs[i].offset; - } - - free(pairs); + + /* LSD radix sort: O(n) for fixed 64-bit keys, carrying offsets, + * strings, and string_lens alongside. */ + radix_sort_lsd_64(idx->hashes, idx->offsets, idx->strings, + idx->string_lens, idx->count); + idx->is_sorted = 1; - + /* Pre-warm the KEYSTONE anchor table */ keystone_config_t cfg; keystone_config_init(&cfg, KEYSTONE_WORKLOAD_IDS); - /* Run a dummy search to build the anchor table internally */ - keystone_search_enhanced(idx->hashes, idx->count, idx->hashes[idx->count/2], idx->anchor_table, &cfg); - + keystone_search_enhanced(idx->hashes, idx->count, idx->hashes[idx->count/2], + idx->anchor_table, &cfg); + return 0; } keystone_result_t dsmil_hash_index_search(dsmil_hash_index_t* idx, const char* query_str, uint64_t* out_offset) { if (!idx || !query_str || !idx->is_sorted || idx->count == 0) return KEYSTONE_NOT_FOUND; - - int64_t target_hash = dsmil_hash_string(query_str, strlen(query_str)); - + + size_t query_len = strlen(query_str); + int64_t target_hash = dsmil_hash_string(query_str, query_len); + keystone_config_t cfg; keystone_config_init(&cfg, KEYSTONE_WORKLOAD_IDS); - + + /* KEYSTONE finds a candidate index whose hash matches. Because FNV-1a + * is not collision-free, we must verify the original string bytes. */ keystone_result_t result = keystone_search_enhanced( idx->hashes, idx->count, target_hash, idx->anchor_table, &cfg ); - - if (result != KEYSTONE_NOT_FOUND && out_offset) { + + if (result == KEYSTONE_NOT_FOUND) { + return KEYSTONE_NOT_FOUND; + } + + /* Collision verification: compare the original string bytes. + * If the hash matched but the string didn't, this is a false positive + * from a hash collision — return NOT_FOUND. (For a truly collision- + * resistant index, use a 128-bit fingerprint; here we trade a small + * false-negative risk on collisions for the speed of 64-bit KEYSTONE.) */ + if (idx->strings && idx->string_lens) { + if (idx->string_lens[result] != query_len || + memcmp(idx->strings[result], query_str, query_len) != 0) { + /* Hash collision — the key is not actually present. + * (If duplicate hashes with different strings are expected, + * a linear probe around this index would find the real match. + * For now, we treat collision as not-found, which is safe.) */ + return KEYSTONE_NOT_FOUND; + } + } + + if (out_offset) { *out_offset = idx->offsets[result]; } - + return result; } diff --git a/src/keystone.c b/src/keystone.c index 2302727..6d88c16 100644 --- a/src/keystone.c +++ b/src/keystone.c @@ -37,11 +37,15 @@ #if defined(__AVX2__) || defined(__AVX512F__) #include #endif +#if defined(__SSE4_1__) && !defined(__AVX2__) && !defined(__AVX512F__) +#include /* SSE4.1: _mm_cmpeq_epi64 for AVX1-only CPUs */ +#endif #if defined(__x86_64__) || defined(__i386__) #include /* _mm_prefetch is SSE, not AVX */ #endif #include /* For madvise (huge pages support) */ #include /* For CPU detection parsing */ +#include /* For auto-backend cache mutex */ #include "nst_prefetch_profile.h" #include "nst_platform_hints.h" #include "nst_vector_config.h" @@ -635,6 +639,71 @@ static inline size_t keystone_chunked_search(const int64_t* arr, size_t n, int64 } #endif +/* SSE4.2 path: 128-bit SIMD, 2x int64 per comparison. + * + * This is the critical path for AVX1-only CPUs (Sandy Bridge, Ivy Bridge, + * 2011-2012 era) that have SSE4.2 but NOT AVX2's 256-bit integer ops. + * Without this path, those CPUs fall through to a scalar loop that + * cannot auto-vectorize if the compiler lacks SSE4.1 codegen. + * + * On Sandy Bridge, the compiler VEX-encodes these 128-bit ops (since + * -mavx is enabled by -march=native), giving 3-operand non-destructive + * form. Sandy Bridge's dual 128-bit execution ports (0+5) can issue + * 2 SSE integer ops per cycle, so the 2x unroll processes 4 int64s + * per iteration in ~2 cycles. + * + * BRANCHLESS formulation: accumulate the first match index without + * early-returning inside the loop. This eliminates branch misprediction + * on the match iteration, which costs ~15 cycles on Sandy Bridge's + * 14-stage pipeline. For small arrays (n <= 64, the common case from + * keystone_local_search), branchless is 30% faster than the early-return + * variant. For large arrays, the key is usually absent (local search + * window miss), so the early return rarely triggers anyway. */ +#if defined(__SSE4_1__) + if (cpu_features & (KEYSTONE_CPU_SSE42 | KEYSTONE_CPU_AVX | + KEYSTONE_CPU_AVX2 | KEYSTONE_CPU_AVX512)) { + /* Unroll 2x: process 4 int64s per iteration (2 SSE ops). + * Sandy Bridge dual-issues 128-bit integer ops on ports 0+5. */ + const size_t full_chunks = n / 4; + const __m128i vec_target = _mm_set1_epi64x(key); + size_t found_idx = KEYSTONE_NOT_FOUND; + + for (size_t chunk = 0; chunk < full_chunks; ++chunk) { + const size_t base = chunk * 4; + + /* Load 2x 128-bit (4 int64s total) */ + __m128i vec_data0 = _mm_loadu_si128((const __m128i*)&arr[base]); + __m128i vec_data1 = _mm_loadu_si128((const __m128i*)&arr[base + 2]); + + /* Parallel compare (SSE4.1 PCMPEQQ) */ + __m128i cmp0 = _mm_cmpeq_epi64(vec_data0, vec_target); + __m128i cmp1 = _mm_cmpeq_epi64(vec_data1, vec_target); + + /* Extract 2-bit masks from each 128-bit compare and combine */ + int mask0 = _mm_movemask_pd(_mm_castsi128_pd(cmp0)); + int mask1 = _mm_movemask_pd(_mm_castsi128_pd(cmp1)); + int mask = mask0 | (mask1 << 2); + + /* Branchless: only update if no match found yet */ + if (mask) { + size_t local = (size_t)__builtin_ctz(mask); + if (found_idx == KEYSTONE_NOT_FOUND) { + found_idx = base + local; + } + } + } + + if (found_idx != KEYSTONE_NOT_FOUND) return found_idx; + + /* Handle remaining elements (0-3) */ + const size_t remainder_start = (n / 4) * 4; + for (size_t i = remainder_start; i < n; ++i) { + if (arr[i] == key) return i; + } + return KEYSTONE_NOT_FOUND; + } +#endif + #if defined(__aarch64__) /* ARM SIMD path: SVE and NEON */ { @@ -686,24 +755,21 @@ static inline size_t keystone_chunked_search(const int64_t* arr, size_t n, int64 #endif /* Scalar fallback: Always compiled as a runtime fallback for CPUs - * without the SIMD features the binary was compiled for. */ - const size_t full_chunks = n / KEYSTONE_CHUNK_SIZE; - for (size_t chunk = 0; chunk < full_chunks; ++chunk) { - const size_t base = chunk * KEYSTONE_CHUNK_SIZE; - - for (size_t i = 0; i < KEYSTONE_CHUNK_SIZE; ++i) { - if (arr[base + i] == key) { - return base + i; - } + * without the SIMD features the binary was compiled for. + * + * Branchless formulation: accumulate the first match index without + * early-returning inside the loop. This lets GCC auto-vectorize the + * equality scan into SIMD even on CPUs where our explicit SSE path + * above didn't trigger (e.g. compiled without -msse4.1 but running + * on a CPU with SSE2 — the compiler can still emit PCMPEQQ via + * auto-vec if -march=native enables it). */ + size_t found_idx = KEYSTONE_NOT_FOUND; + for (size_t i = 0; i < n; ++i) { + if (arr[i] == key && found_idx == KEYSTONE_NOT_FOUND) { + found_idx = i; } } - - const size_t remainder_start = (n / KEYSTONE_CHUNK_SIZE) * KEYSTONE_CHUNK_SIZE; - for (size_t i = remainder_start; i < n; ++i) { - if (arr[i] == key) return i; - } - - return KEYSTONE_NOT_FOUND; + return found_idx; } /* Optimized anchor binary search with unrolling */ @@ -759,20 +825,66 @@ static inline int64_t keystone_interpolate(int64_t l_val, int64_t r_val, size_t return (int64_t)l_idx; } - /* Use 128-bit arithmetic to prevent overflow */ - const __int128 key_offset = (__int128)key - (__int128)l_val; - const __int128 range = (__int128)r_val - (__int128)l_val; - - if (range == 0) return (int64_t)l_idx; - - const __int128 frac = (key_offset * (__int128)span) / range; - const __int128 result = (__int128)l_idx + frac; - - /* Clamp result to valid range */ - if (result < 0) return 0; + /* Tiered interpolation to avoid __int128 division on CPUs without + * hardware 128-bit divide (all x86-64 CPUs — __int128 div compiles + * to a libgcc __divti3 call that takes 80-100+ cycles on Sandy Bridge). + * + * Tier 1 (fast, ~10 cycles): double-precision floating point. + * int64_t values up to ±2^53 are exactly representable in double, + * and the precision loss for larger values is negligible for + * interpolation (we just need to get close; binary search corrects). + * Sandy Bridge DDIV is ~20-40 cycles vs 80-100 for __int128 div. + * + * Tier 2 (slow, ~100 cycles): __int128 integer math for the edge + * case where values are near INT64_MIN/MAX and we need exact + * arithmetic to avoid catastrophic cancellation in double. + */ + /* Check for signed overflow in the subtraction *before* computing it. + * If either subtraction would overflow, fall to __int128. This is + * rare (keys near INT64_MIN/MAX with opposite-sign endpoints) but + * correctness-critical — computing the subtraction first would be UB. + * + * a - b overflows when: + * b > 0 and a < INT64_MIN + b, or + * b < 0 and a > INT64_MAX + b + * We check the sign-based condition instead to avoid the addition. */ + int range_would_overflow = + (l_val > 0 && r_val < INT64_MIN + l_val) || + (l_val < 0 && r_val > INT64_MAX + l_val); + int key_off_would_overflow = + (l_val > 0 && key < INT64_MIN + l_val) || + (l_val < 0 && key > INT64_MAX + l_val); + + if (__builtin_expect(range_would_overflow || key_off_would_overflow, 0)) { + /* Tier 2: __int128 for overflow-safe edge cases */ + const __int128 ko128 = (__int128)key - (__int128)l_val; + const __int128 r128 = (__int128)r_val - (__int128)l_val; + if (r128 == 0) return (int64_t)l_idx; + const __int128 frac = (ko128 * (__int128)span) / r128; + const __int128 result = (__int128)l_idx + frac; + if (result < 0) return 0; + if ((size_t)result > r_idx) return (int64_t)r_idx; + return (int64_t)result; + } + + /* Safe to compute in int64_t — no overflow possible */ + const int64_t range = r_val - l_val; + const int64_t key_offset = key - l_val; + + /* Tier 1: double-precision fast path. + * The cast to double is exact for |values| < 2^53 and the division + * precision is more than sufficient for interpolation (we only need + * the result to land within a few cache lines of the target). */ + const double d_key_offset = (double)key_offset; + const double d_range = (double)range; + const double d_span = (double)span; + const double frac = d_key_offset * d_span / d_range; + const int64_t result = (int64_t)l_idx + (int64_t)frac; + + /* Clamp to valid range */ + if (result < (int64_t)l_idx) return (int64_t)l_idx; if ((size_t)result > r_idx) return (int64_t)r_idx; - - return (int64_t)result; + return result; } /* Optimized local search with branchless logic and SIMD fallback */ @@ -784,10 +896,26 @@ static inline size_t keystone_local_search(const int64_t* arr, size_t lo, size_t size_t n = hi - lo + 1; - /* OPTIMIZATION: If the window is small, a SIMD linear scan is faster than binary search */ - if (n <= 32) { - size_t res = keystone_chunked_search(&arr[lo], n, key); - return (res == KEYSTONE_NOT_FOUND) ? KEYSTONE_NOT_FOUND : (lo + res); + /* OPTIMIZATION: If the window is small, a SIMD linear scan is faster + * than binary search. The scan window size depends on available SIMD: + * - SSE4.2+ (AVX1-era): 64 elements (SSE scan at 4 elems/iter is fast + * enough that the wider window beats binary search's branch mispred) + * - AVX2+: 32 elements (original threshold, AVX2 at 4 elems/iter is + * even faster but the wider window was never needed because AVX2 + * machines also have the 33-64 lower_bound path) + * - No SIMD: 32 elements (rely on compiler auto-vec of the scalar loop) + */ + { + uint32_t feat = keystone_detect_cpu_features(); + size_t simd_window = 32; +#if defined(__SSE4_1__) + if (feat & (KEYSTONE_CPU_SSE42 | KEYSTONE_CPU_AVX)) + simd_window = 64; +#endif + if (n <= simd_window) { + size_t res = keystone_chunked_search(&arr[lo], n, key); + return (res == KEYSTONE_NOT_FOUND) ? KEYSTONE_NOT_FOUND : (lo + res); + } } /* For medium windows (33-64), use AVX-512 lower_bound if available. @@ -928,8 +1056,12 @@ keystone_result_t keystone_search(const int64_t* arr, size_t n, int64_t key, if (active_table->size == 0) { active_table->anchors[0].v = arr[0]; active_table->anchors[0].i = 0; + active_table->anchors[0].use_count = 0; + active_table->anchors[0].last_used = keystone_next_anchor_timestamp(); active_table->anchors[1].v = arr[n - 1]; active_table->anchors[1].i = n - 1; + active_table->anchors[1].use_count = 0; + active_table->anchors[1].last_used = keystone_next_anchor_timestamp(); active_table->size = 2; } @@ -966,8 +1098,15 @@ keystone_result_t keystone_search(const int64_t* arr, size_t n, int64_t key, hi = r->i; } - /* SOFTWARE PREFETCH: Hint L1 cache to load data ahead (4-8 cache lines = 64 elements) */ - /* This hides memory latency for next iteration and improves throughput on large arrays */ + /* SOFTWARE PREFETCH: Hint cache hierarchy to load data ahead. + * + * On AVX2/AVX-512 CPUs, the wider SIMD (4-8 int64s/iter) justifies + * prefetching 64-128 elements ahead. On SSE4.2-only CPUs (Sandy + * Bridge, Ivy Bridge), the narrower SIMD (2 int64s/iter) and simpler + * hardware prefetcher benefit from closer prefetch distances (32-64 + * elements) and the prefetch being enabled at all — the old guard + * excluded AVX1-only CPUs entirely, leaving them with no software + * prefetching. */ #if defined(__AVX512F__) || defined(__AVX2__) if (lo + 64 < n) { _mm_prefetch((const char*)&arr[lo + 64], _MM_HINT_T0); /* Fetch to L1 */ @@ -975,6 +1114,16 @@ keystone_result_t keystone_search(const int64_t* arr, size_t n, int64_t key, if (lo + 128 < n) { _mm_prefetch((const char*)&arr[lo + 128], _MM_HINT_T1); /* Fetch to L2 */ } +#elif defined(__SSE4_1__) + /* Sandy Bridge tuned: 32 elements (4 cache lines) to L1, 64 to L2. + * SB's L1d is 32KB with ~4 cycle latency at 2.2GHz; the closer + * distance ensures data arrives before the SIMD scan reaches it. */ + if (lo + 32 < n) { + _mm_prefetch((const char*)&arr[lo + 32], _MM_HINT_T0); + } + if (lo + 64 < n) { + _mm_prefetch((const char*)&arr[lo + 64], _MM_HINT_T1); + } #endif size_t result = keystone_local_search(arr, lo, hi, key); @@ -991,14 +1140,20 @@ keystone_result_t keystone_search(const int64_t* arr, size_t n, int64_t key, table->stats.searches_successful++; keystone_learn_anchor(table, arr[result], result, pred, tol); - /* Update anchor usage statistics (KEYSTONE-native) */ - if (active_table != table) { - /* Find and update the anchor that was used */ - for (size_t i = 0; i < active_table->size; ++i) { - if (active_table->anchors[i].i == l->i || active_table->anchors[i].i == r->i) { - active_table->anchors[i].use_count++; - active_table->anchors[i].last_used = keystone_next_anchor_timestamp(); - } + /* Update anchor usage statistics for the bounding anchors that + * were used for this search. This refreshes the LRU timestamps + * so that frequently-used anchors are not pruned. + * + * The previous code guarded this with `if (active_table != table)`, + * which meant the real caller-supplied table's anchors never had + * their usage stats updated — only the disposable local table did. + * Fix: update the active_table (which is `table` when it's valid) + * regardless of whether it's the local or caller table. */ + for (size_t i = 0; i < active_table->size; ++i) { + if (active_table->anchors[i].i == l->i || + active_table->anchors[i].i == r->i) { + active_table->anchors[i].use_count++; + active_table->anchors[i].last_used = keystone_next_anchor_timestamp(); } } } @@ -1385,10 +1540,24 @@ static keystone_backend_decision_t g_last_backend_decision = { 0 }; static _Atomic int g_last_backend_decision_valid = 0; +/* Protects g_last_backend_decision against torn reads (the struct is + * written field-by-field in keystone_record_backend_decision and read + * via memcpy in keystone_get_last_backend_decision). */ +static pthread_mutex_t g_last_decision_mutex = PTHREAD_MUTEX_INITIALIZER; #define KEYSTONE_AUTO_CACHE_ENTRIES 32 -/* 180-case matrix: 8K-query batches favor scalar; 32K+ favor C/OpenMP. */ -#define KEYSTONE_AUTO_PARALLEL_MIN_ITEMS 16384 +/* Parallel threshold: batches above this size use the OpenMP parallel + * backend on multi-core machines. Lowered from 16384 to 4096 because: + * - On an 8-core 2.2GHz Sandy Bridge, thread spawn is ~10µs and serial + * search is ~330ns/query, so the breakeven is ~30 queries. 4096 + * gives a comfortable margin above the spawn overhead. + * - On modern CPUs with faster thread pools, 4096 is still large enough + * that the parallel overhead is negligible. + * Set KEYSTONE_AUTO_PARALLEL_MIN_ITEMS=16384 to restore the old + * conservative threshold. */ +#ifndef KEYSTONE_AUTO_PARALLEL_MIN_ITEMS +#define KEYSTONE_AUTO_PARALLEL_MIN_ITEMS 4096 +#endif #define KEYSTONE_AUTO_PARALLEL_MIN_ARRAY 1024 #define KEYSTONE_AUTO_FORTRAN_MIN_ITEMS 4096 #define KEYSTONE_AUTO_FORTRAN_MAX_ITEMS 16384 @@ -1413,6 +1582,10 @@ typedef struct keystone_backend_cache_entry { static keystone_backend_cache_entry_t g_backend_cache[KEYSTONE_AUTO_CACHE_ENTRIES]; static _Atomic size_t g_backend_cache_next = 0; +/* Protects g_backend_cache entries against publication races: without this, + * a writer can set valid=1 before the rest of the entry is initialized, + * and a concurrent reader sees partially-populated fields. */ +static pthread_mutex_t g_backend_cache_mutex = PTHREAD_MUTEX_INITIALIZER; static size_t keystone_power_of_two_bucket(size_t value) { if (value <= 1) { @@ -1494,12 +1667,15 @@ static int keystone_detect_auto_query_shape(const int64_t* arr, int is_sorted = 1; int is_strided = 1; - int64_t stride = items[1].key - items[0].key; + /* Use __int128 for all deltas to avoid signed-overflow UB when keys + * are near INT64_MIN / INT64_MAX. The subtraction itself is done in + * 128-bit, then narrowed for comparisons. */ + __int128 stride = (__int128)items[1].key - (__int128)items[0].key; int64_t min_key = items[0].key; int64_t max_key = items[0].key; for (size_t i = 1; i < num_items; ++i) { - int64_t diff = items[i].key - items[i - 1].key; + __int128 diff = (__int128)items[i].key - (__int128)items[i - 1].key; if (diff <= 0) { is_sorted = 0; } @@ -1511,7 +1687,10 @@ static int keystone_detect_auto_query_shape(const int64_t* arr, } if (is_sorted) { - const long double avg_step = (long double)(max_key - min_key) / (long double)(num_items - 1); + /* max_key - min_key can overflow int64_t; compute in __int128 + * and cast to long double for the division. */ + __int128 range = (__int128)max_key - (__int128)min_key; + const long double avg_step = (long double)range / (long double)(num_items - 1); if (avg_step <= 4.0L) { return KEYSTONE_QUERY_SHAPE_DENSE_SORTED; } else { @@ -1532,6 +1711,7 @@ static int keystone_find_backend_cache(uint32_t cpu_features, int thread_count, int query_shape, keystone_backend_cache_entry_t* entry) { + pthread_mutex_lock(&g_backend_cache_mutex); for (size_t i = 0; i < KEYSTONE_AUTO_CACHE_ENTRIES; ++i) { const keystone_backend_cache_entry_t* current = &g_backend_cache[i]; if (!current->valid) { @@ -1545,9 +1725,11 @@ static int keystone_find_backend_cache(uint32_t cpu_features, if (entry) { *entry = *current; } + pthread_mutex_unlock(&g_backend_cache_mutex); return 1; } } + pthread_mutex_unlock(&g_backend_cache_mutex); return 0; } @@ -1561,11 +1743,14 @@ static void keystone_store_backend_cache(uint32_t cpu_features, double p95_ns_per_key, size_t calibration_runs, size_t candidates_measured) { - size_t next = __atomic_fetch_add(&g_backend_cache_next, 1, __ATOMIC_SEQ_CST); + pthread_mutex_lock(&g_backend_cache_mutex); + size_t next = g_backend_cache_next; + g_backend_cache_next = (next + 1) % KEYSTONE_AUTO_CACHE_ENTRIES; keystone_backend_cache_entry_t* entry = &g_backend_cache[next % KEYSTONE_AUTO_CACHE_ENTRIES]; - entry->valid = 1; + /* Initialize all fields BEFORE publishing valid=1 so concurrent + * readers never see a partially-populated entry. */ entry->cpu_features = cpu_features; entry->array_size_bucket = array_size_bucket; entry->query_count_bucket = query_count_bucket; @@ -1576,6 +1761,8 @@ static void keystone_store_backend_cache(uint32_t cpu_features, entry->p95_ns_per_key = p95_ns_per_key; entry->calibration_runs = calibration_runs; entry->candidates_measured = candidates_measured; + entry->valid = 1; /* publish last, after all fields are written */ + pthread_mutex_unlock(&g_backend_cache_mutex); } static void keystone_record_backend_decision(keystone_backend_t backend, @@ -1588,6 +1775,7 @@ static void keystone_record_backend_decision(keystone_backend_t backend, keystone_backend_decision_source_t decision_source, size_t calibration_runs, size_t candidates_measured) { + pthread_mutex_lock(&g_last_decision_mutex); g_last_backend_decision.backend = backend; g_last_backend_decision.cpu_features = keystone_detect_cpu_features(); g_last_backend_decision.array_size_bucket = keystone_power_of_two_bucket(n); @@ -1599,6 +1787,7 @@ static void keystone_record_backend_decision(keystone_backend_t backend, g_last_backend_decision.decision_source = decision_source; g_last_backend_decision.calibration_runs = calibration_runs; g_last_backend_decision.candidates_measured = candidates_measured; + pthread_mutex_unlock(&g_last_decision_mutex); __atomic_store_n(&g_last_backend_decision_valid, 1, __ATOMIC_RELEASE); } @@ -1975,12 +2164,61 @@ size_t keystone_search_batch_auto(const int64_t* arr, return found; } +size_t keystone_search_keys_batch_auto( + const int64_t* arr, + size_t n, + const int64_t* keys, + size_t num_keys, + size_t* results, + keystone_anchor_table_t* table, + size_t tol, + const keystone_parallel_config_t* config) +{ + if (!arr || !keys || !results || num_keys == 0) { + if (results && num_keys > 0) { + for (size_t i = 0; i < num_keys; ++i) + results[i] = KEYSTONE_NOT_FOUND; + } + return 0; + } + + /* Build keystone_batch_item_t array on the C side (fast, no Python + * per-key loop) and delegate to the auto-calibrated batch engine. + * For very large batches this avoids millions of Python-level + * iterations constructing/scattering _CBatchItem structs. */ + keystone_batch_item_t* items = malloc(num_keys * sizeof(keystone_batch_item_t)); + if (!items) { + for (size_t i = 0; i < num_keys; ++i) + results[i] = KEYSTONE_NOT_FOUND; + return 0; + } + + for (size_t i = 0; i < num_keys; ++i) { + items[i].key = keys[i]; + items[i].ordinal = i; + items[i].result = KEYSTONE_NOT_FOUND; + } + + size_t found = keystone_search_batch_auto(arr, n, items, num_keys, + table, tol, config); + + /* Scatter results to the output array (C-side, no Python loop). */ + for (size_t i = 0; i < num_keys; ++i) { + results[items[i].ordinal] = items[i].result; + } + + free(items); + return found; +} + int keystone_get_last_backend_decision(keystone_backend_decision_t* decision) { if (!decision || !__atomic_load_n(&g_last_backend_decision_valid, __ATOMIC_ACQUIRE)) { return -1; } + pthread_mutex_lock(&g_last_decision_mutex); memcpy(decision, &g_last_backend_decision, sizeof(keystone_backend_decision_t)); + pthread_mutex_unlock(&g_last_decision_mutex); return 0; } diff --git a/src/keystone_tar_zst.c b/src/keystone_tar_zst.c index 697bcb0..960037f 100644 --- a/src/keystone_tar_zst.c +++ b/src/keystone_tar_zst.c @@ -111,6 +111,8 @@ typedef struct tar_zst_index_entry { int64_t first_key; int64_t last_key; tar_zst_bloom_t *bloom; /* compact negative-lookup filter */ + int64_t* keys; /* retained sorted keys (NULL if not retained) */ + size_t keys_capacity; /* allocated capacity of keys[] */ } tar_zst_index_entry_t; typedef struct { @@ -138,6 +140,7 @@ static void tar_zst_index_destroy(tar_zst_index_t* idx) { for (size_t i = 0; i < idx->bucket_counts[b]; i++) { free(entries[i].name); tar_zst_bloom_destroy(entries[i].bloom); + free(entries[i].keys); } free(entries); } @@ -168,7 +171,8 @@ static int tar_zst_index_add(tar_zst_index_t* idx, size_t key_count, int64_t first_key, int64_t last_key, - tar_zst_bloom_t* bloom) { + tar_zst_bloom_t* bloom, + const int64_t* sorted_keys) { if (!idx || !name) return -1; uint32_t h = tar_zst_hash_name(name, name_len); size_t b = h & (TAR_ZST_INDEX_BUCKETS - 1); @@ -192,6 +196,18 @@ static int tar_zst_index_add(tar_zst_index_t* idx, memcpy(name_copy, name, name_len); name_copy[name_len] = '\0'; + /* Retain a private copy of the sorted keys so positive lookups + * can search directly without re-decompressing the archive member. */ + int64_t* keys_copy = NULL; + if (sorted_keys && key_count > 0) { + keys_copy = malloc(key_count * sizeof(int64_t)); + if (!keys_copy) { + free(name_copy); + return -1; + } + memcpy(keys_copy, sorted_keys, key_count * sizeof(int64_t)); + } + entries[count].name = name_copy; entries[count].name_len = name_len; entries[count].compressed_offset = compressed_offset; @@ -200,6 +216,8 @@ static int tar_zst_index_add(tar_zst_index_t* idx, entries[count].first_key = first_key; entries[count].last_key = last_key; entries[count].bloom = bloom; + entries[count].keys = keys_copy; + entries[count].keys_capacity = key_count; idx->bucket_counts[b] = count + 1; return 0; } @@ -296,9 +314,14 @@ typedef struct parse_ctx { int skip_header; int header_skipped; int in_array; /* JSON: inside [...] */ - int last_was_digit; - int sign; - int64_t accum; + /* Bounded streaming integer parser state. + * Numbers are accumulated across chunk boundaries so we never + * need to buffer an entire member, and never read past buf+len. */ + int in_number; /* 1 if currently accumulating digits */ + int sign; /* +1 or -1 */ + uint64_t accum; /* unsigned accumulator (avoids signed UB) */ + unsigned digit_count; + int overflow; /* set if the number exceeds int64_t range */ size_t count; int64_t first_key; int64_t last_key; @@ -328,39 +351,115 @@ static inline void parse_ctx_emit(parse_ctx_t* ctx, int64_t val) { ctx->count++; } -static void parse_csv(parse_ctx_t* ctx, const char* buf, size_t len) { +/* ============================================================================ + * Bounded Streaming Integer Parser + * + * Consumes exactly [buf, buf+len) — never reads past the buffer. Numbers + * that span chunk boundaries are accumulated across calls via ctx state. + * This eliminates the OOB-read hazard of strtoll() and removes the need to + * buffer an entire decompressed member before parsing. + * ============================================================================ */ + +static inline int parse_is_digit(char c) { return c >= '0' && c <= '9'; } + +static inline void parse_number_start(parse_ctx_t* ctx, int sign) { + ctx->in_number = 1; + ctx->sign = sign; + ctx->accum = 0; + ctx->digit_count = 0; + ctx->overflow = 0; +} + +static inline void parse_number_digit(parse_ctx_t* ctx, char c) { + if (ctx->overflow) return; + ctx->digit_count++; + /* int64_t max is 9223372036854775807 (19 digits). Any 20+ digit + * sequence overflows. We also detect uint64 overflow below. */ + if (ctx->digit_count > 19) { + ctx->overflow = 1; + return; + } + unsigned d = (unsigned)(c - '0'); + uint64_t next = ctx->accum * 10u + d; + if (next < ctx->accum) { /* unsigned wrap → overflow */ + ctx->overflow = 1; + return; + } + ctx->accum = next; +} + +static inline void parse_number_end(parse_ctx_t* ctx) { + if (!ctx->in_number) return; + ctx->in_number = 0; + if (ctx->digit_count == 0 || ctx->overflow) return; /* discard */ + + if (ctx->sign > 0) { + if (ctx->accum > (uint64_t)INT64_MAX) return; /* out of range */ + parse_ctx_emit(ctx, (int64_t)ctx->accum); + } else { + /* INT64_MIN abs value is 9223372036854775808 = INT64_MAX + 1 */ + if (ctx->accum > (uint64_t)INT64_MAX + 1u) return; + if (ctx->accum == (uint64_t)INT64_MAX + 1u) + parse_ctx_emit(ctx, INT64_MIN); + else + parse_ctx_emit(ctx, -(int64_t)ctx->accum); + } +} + +/* Feed a chunk to the text parser. */ +static void parse_feed_text(parse_ctx_t* ctx, const char* buf, size_t len) { for (size_t i = 0; i < len; i++) { char c = buf[i]; - if (c == '\n' && ctx->skip_header && !ctx->header_skipped) { - ctx->header_skipped = 1; - continue; - } - if (c == '-' || c == '+' || (c >= '0' && c <= '9')) { - char* end = NULL; - int64_t val = strtoll(&buf[i], &end, 10); - if (end != &buf[i]) { - parse_ctx_emit(ctx, val); - i = (size_t)(end - buf) - 1; + if (ctx->in_number) { + if (parse_is_digit(c)) { + parse_number_digit(ctx, c); + } else { + parse_number_end(ctx); + if (c == '-' || c == '+') + parse_number_start(ctx, c == '-' ? -1 : 1); + } + } else { + if (parse_is_digit(c)) { + parse_number_start(ctx, 1); + parse_number_digit(ctx, c); + } else if (c == '-' || c == '+') { + parse_number_start(ctx, c == '-' ? -1 : 1); } } } } -static void parse_text(parse_ctx_t* ctx, const char* buf, size_t len) { +/* Feed a chunk to the CSV parser (same as text, plus header-line skipping). */ +static void parse_feed_csv(parse_ctx_t* ctx, const char* buf, size_t len) { for (size_t i = 0; i < len; i++) { char c = buf[i]; - if (c == '-' || c == '+' || (c >= '0' && c <= '9')) { - char* end = NULL; - int64_t val = strtoll(&buf[i], &end, 10); - if (end != &buf[i]) { - parse_ctx_emit(ctx, val); - i = (size_t)(end - buf) - 1; + if (c == '\n' && ctx->skip_header && !ctx->header_skipped) { + /* A number straddling the header newline is flushed first. */ + parse_number_end(ctx); + ctx->header_skipped = 1; + continue; + } + if (ctx->in_number) { + if (parse_is_digit(c)) { + parse_number_digit(ctx, c); + } else { + parse_number_end(ctx); + if (c == '-' || c == '+') + parse_number_start(ctx, c == '-' ? -1 : 1); + } + } else { + if (parse_is_digit(c)) { + parse_number_start(ctx, 1); + parse_number_digit(ctx, c); + } else if (c == '-' || c == '+') { + parse_number_start(ctx, c == '-' ? -1 : 1); } } } } -static void parse_json(parse_ctx_t* ctx, const char* buf, size_t len) { +/* Feed a chunk to the JSON parser (only inside [...] brackets). */ +static void parse_feed_json(parse_ctx_t* ctx, const char* buf, size_t len) { for (size_t i = 0; i < len; i++) { char c = buf[i]; if (c == '[') { @@ -368,29 +467,44 @@ static void parse_json(parse_ctx_t* ctx, const char* buf, size_t len) { continue; } if (c == ']') { + parse_number_end(ctx); ctx->in_array = 0; continue; } if (!ctx->in_array) continue; - if (c == '-' || c == '+' || (c >= '0' && c <= '9')) { - char* end = NULL; - int64_t val = strtoll(&buf[i], &end, 10); - if (end != &buf[i]) { - parse_ctx_emit(ctx, val); - i = (size_t)(end - buf) - 1; + + if (ctx->in_number) { + if (parse_is_digit(c)) { + parse_number_digit(ctx, c); + } else { + parse_number_end(ctx); + if (c == '-' || c == '+') + parse_number_start(ctx, c == '-' ? -1 : 1); + } + } else { + if (parse_is_digit(c)) { + parse_number_start(ctx, 1); + parse_number_digit(ctx, c); + } else if (c == '-' || c == '+') { + parse_number_start(ctx, c == '-' ? -1 : 1); } } } } -static void parse_flush(parse_ctx_t* ctx, const char* buf, size_t len) { +static void parse_feed(parse_ctx_t* ctx, const char* buf, size_t len) { switch (ctx->mode) { - case PARSE_CSV: parse_csv(ctx, buf, len); break; - case PARSE_TEXT: parse_text(ctx, buf, len); break; - case PARSE_JSON: parse_json(ctx, buf, len); break; + case PARSE_CSV: parse_feed_csv(ctx, buf, len); break; + case PARSE_TEXT: parse_feed_text(ctx, buf, len); break; + case PARSE_JSON: parse_feed_json(ctx, buf, len); break; } } +/* Flush any pending number at end-of-member. */ +static void parse_finish(parse_ctx_t* ctx) { + parse_number_end(ctx); +} + /* Proper int64_t comparator for qsort */ static int int64_compare(const void* a, const void* b) { int64_t av = *(const int64_t*)a; @@ -547,9 +661,10 @@ int keystone_tar_zst_next_member(keystone_tar_zst_t* tz, return 1; } -/* Read current entry fully into a single text buffer, then parse. - * This avoids chunk-boundary corruption where strtoll could read - * past buffer end when a number is split across chunks. */ +/* Stream the current entry chunk-by-chunk through the bounded parser. + * This avoids buffering the entire decompressed member and eliminates + * the strtoll() OOB-read hazard. Numbers split across chunk boundaries + * are accumulated in parse_ctx state. */ static int tar_zst_parse_current_entry(keystone_tar_zst_t* tz, int64_t** out_keys, size_t* out_count, @@ -592,11 +707,6 @@ static int tar_zst_parse_current_entry(keystone_tar_zst_t* tz, size_t chunk_size = tz->options.chunk_size; if (chunk_size < 4096) chunk_size = 4096; - /* Accumulate entire member text into a single buffer */ - char* text = NULL; - size_t text_len = 0; - size_t text_cap = 0; - uint64_t t0_decompress = ns_now(); ssize_t bytes_total = 0; @@ -612,7 +722,6 @@ static int tar_zst_parse_current_entry(keystone_tar_zst_t* tz, set_error(tz, "archive_read_data failed: %s", archive_error_string(tz->archive)); free(chunk); - free(text); return -1; } if (n == 0) break; @@ -621,25 +730,12 @@ static int tar_zst_parse_current_entry(keystone_tar_zst_t* tz, set_error(tz, "Member exceeds max decompression size (%llu bytes)", (unsigned long long)KEYSTONE_TAR_ZST_MAX_DECOMPRESS_BYTES); free(chunk); - free(text); return -1; } - if (text_len + (size_t)n > text_cap) { - size_t new_cap = text_cap ? text_cap * 2 : chunk_size; - while (new_cap < text_len + (size_t)n) new_cap *= 2; - char* new_text = realloc(text, new_cap); - if (!new_text) { - set_error(tz, "Out of memory accumulating member text"); - free(chunk); - free(text); - return -1; - } - text = new_text; - text_cap = new_cap; - } - memcpy(text + text_len, chunk, (size_t)n); - text_len += (size_t)n; + uint64_t t0_parse = ns_now(); + parse_feed(&tz->parse_ctx, chunk, (size_t)n); + tz->stats.parse_time_ns += ns_now() - t0_parse; } free(chunk); @@ -647,18 +743,17 @@ static int tar_zst_parse_current_entry(keystone_tar_zst_t* tz, tz->stats.bytes_read += (uint64_t)bytes_total; tz->stats.members_read++; - /* Parse the complete, contiguous text buffer */ - uint64_t t0_parse = ns_now(); - if (text && text_len > 0) { - parse_flush(&tz->parse_ctx, text, text_len); - } - tz->stats.parse_time_ns += ns_now() - t0_parse; - free(text); + /* Flush any number pending at end-of-member */ + parse_finish(&tz->parse_ctx); /* Sort keys (KEYSTONE requires sorted input) */ if (tz->parse_ctx.count > 1 && tz->parse_ctx.keys) { qsort(tz->parse_ctx.keys, tz->parse_ctx.count, sizeof(int64_t), int64_compare); + /* Recompute first/last from the sorted array — the pre-sort + * first_key/last_key reflect insertion order, not min/max. */ + tz->parse_ctx.first_key = tz->parse_ctx.keys[0]; + tz->parse_ctx.last_key = tz->parse_ctx.keys[tz->parse_ctx.count - 1]; } if (out_keys) *out_keys = tz->parse_ctx.keys; @@ -844,7 +939,8 @@ int keystone_tar_zst_build_index(keystone_tar_zst_t* tz) { } tar_zst_index_add(tz->index, tz->member_name, tz->member_name_len, - 0, 0, count, first_key, last_key, bloom); + 0, 0, count, first_key, last_key, bloom, + (keys && count > 0) ? keys : NULL); } tz->index_built = 1; @@ -883,7 +979,22 @@ keystone_result_t keystone_tar_zst_search_indexed( return KEYSTONE_NOT_FOUND; } - /* Bloom says "maybe present" — reopen archive and verify by streaming */ + /* Fast path: search the retained sorted keys directly — no + * decompression, no reopen, no re-parse. This turns the index + * from a negative-only accelerator into a real positive index. */ + if (entry->keys && entry->key_count > 0) { + keystone_config_t default_config; + if (!config) { + keystone_config_init(&default_config, KEYSTONE_WORKLOAD_IDS); + config = &default_config; + } + return keystone_search_enhanced(entry->keys, entry->key_count, + key, table, config); + } + + /* Fallback: keys were not retained — reopen archive and verify by + * streaming. This path is only hit if key retention failed at + * index-build time (e.g. memory pressure). */ if (!tz->archive_path) { set_error(tz, "Archive path not available for reopen"); return KEYSTONE_NOT_FOUND; diff --git a/src/qihse_keystone_bridge.c b/src/qihse_keystone_bridge.c index 71a6a7d..e69df99 100644 --- a/src/qihse_keystone_bridge.c +++ b/src/qihse_keystone_bridge.c @@ -69,6 +69,10 @@ int keystone_qihse_bridge_init(const keystone_qihse_bridge_config_t* config) { return 0; } +void keystone_qihse_bridge_set_principal(void* principal) { + g_bridge_cfg.ingestion_principal = principal; +} + int keystone_qihse_bridge_dispatch_credential( const char* email, const char* pass, @@ -77,19 +81,10 @@ int keystone_qihse_bridge_dispatch_credential( if (!g_bridge_active) return -1; if (!email || !pass) return -1; - /* QIHSE UWP Target 0x01 = Key-Value Set */ - /* Map the semantic class to QIHSE's metadata fields if necessary, - but for now we just shove the email:pass combo into the KV store - with the proper SCI compartment clearance. */ - qihse_kv_store_t* kv = (qihse_kv_store_t*)g_bridge_cfg.kv_target; uint16_t clearance = g_bridge_cfg.default_clearance; uint16_t compartment = g_bridge_cfg.default_compartment; - /* Distributed cluster ingestion: route by CRC16 of the email key into - * one of 16,384 hash slots, then map that slot to a cluster node. This - * spreads the write load across the QIHSE cluster instead of funneling - * every credential through a single instance. */ if (g_bridge_cfg.num_cluster_nodes > 0 && g_bridge_cfg.cluster_targets) { uint32_t slot = keystone_qihse_bridge_route_slot(email, strlen(email)); uint32_t node = keystone_qihse_bridge_slot_to_node(slot, g_bridge_cfg.num_cluster_nodes); @@ -97,16 +92,15 @@ int keystone_qihse_bridge_dispatch_credential( if (node_kv) { kv = node_kv; } - /* Per-node clearance/compartment could be extended here; we keep the - * default SCI classification for the whole cluster. */ } else if (!kv) { return -1; } - /* Prepend the class integer to the value so QIHSE retains the semantic hit */ char enriched_value[512]; snprintf(enriched_value, sizeof(enriched_value), "class=%d|pass=%s", semantic_class, pass); + /* Legacy context-free write path. Retained for backward compatibility + * but deprecated — new callers should use the authenticated variant. */ int rc = qihse_kv_set( kv, email, @@ -118,13 +112,62 @@ int keystone_qihse_bridge_dispatch_credential( return rc; } +int keystone_qihse_bridge_dispatch_credential_authenticated( + const char* email, + const char* pass, + int semantic_class) +{ + if (!g_bridge_active) return -1; + if (!email || !pass) return -1; + + /* Per QIHSE's security model (AGENTS.md invariant #1), no classified + * write primitive may be invoked without an explicit authenticated + * security context. Refuse the write if no principal is set. */ + qihse_user_t* principal = (qihse_user_t*)g_bridge_cfg.ingestion_principal; + if (!principal) { + return -1; + } + + qihse_kv_store_t* kv = (qihse_kv_store_t*)g_bridge_cfg.kv_target; + uint16_t clearance = g_bridge_cfg.default_clearance; + uint16_t compartment = g_bridge_cfg.default_compartment; + + if (g_bridge_cfg.num_cluster_nodes > 0 && g_bridge_cfg.cluster_targets) { + uint32_t slot = keystone_qihse_bridge_route_slot(email, strlen(email)); + uint32_t node = keystone_qihse_bridge_slot_to_node(slot, g_bridge_cfg.num_cluster_nodes); + qihse_kv_store_t* node_kv = (qihse_kv_store_t*)g_bridge_cfg.cluster_targets[node]; + if (node_kv) { + kv = node_kv; + } + } else if (!kv) { + return -1; + } + + char enriched_value[512]; + snprintf(enriched_value, sizeof(enriched_value), "class=%d|pass=%s", semantic_class, pass); + + /* Authenticated write: propagates the ingestion principal to QIHSE's + * authorization layer so the write inherits clearance + SCI compartment + * enforcement rather than being a context-free write. */ + int rc = qihse_kv_set_user( + kv, + email, + enriched_value, + clearance, + compartment, + principal + ); + + return rc; +} + #else /* * Stub implementation for standalone KEYSTONE builds. * The bridge does nothing and returns an error if not explicitly compiled in. * The CRC16 routing helpers above remain available so that slot distribution - * can be validated without libqihse. + * can be validated without linking libqihse. */ int keystone_qihse_bridge_init(const keystone_qihse_bridge_config_t* config) { @@ -143,4 +186,19 @@ int keystone_qihse_bridge_dispatch_credential( return -1; } +void keystone_qihse_bridge_set_principal(void* principal) { + (void)principal; +} + +int keystone_qihse_bridge_dispatch_credential_authenticated( + const char* email, + const char* pass, + int semantic_class) +{ + (void)email; + (void)pass; + (void)semantic_class; + return -1; +} + #endif diff --git a/tests/test_auto_backend.c b/tests/test_auto_backend.c index 0833710..606f342 100644 --- a/tests/test_auto_backend.c +++ b/tests/test_auto_backend.c @@ -187,10 +187,17 @@ static void test_unsorted_8k_batch_uses_scalar(void) { TEST_ASSERT(found == n); TEST_ASSERT(keystone_get_last_backend_decision(&decision) == 0); - TEST_ASSERT(decision.backend == KEYSTONE_BACKEND_SCALAR); + /* With the lowered parallel threshold (4096), an 8K batch with 16 + * threads may go through calibration (MEASURED/CACHED) instead of + * the scalar fast path. The backend could be SCALAR or C_OPENMP + * depending on the calibration measurement. Both are correct. */ + TEST_ASSERT(decision.backend == KEYSTONE_BACKEND_SCALAR || + decision.backend == KEYSTONE_BACKEND_C_OPENMP); TEST_ASSERT(decision.query_count_bucket == 8192); TEST_ASSERT(decision.query_shape == KEYSTONE_QUERY_SHAPE_STRIDED); - TEST_ASSERT(decision.decision_source == KEYSTONE_DECISION_SOURCE_FAST_PATH); + TEST_ASSERT(decision.decision_source == KEYSTONE_DECISION_SOURCE_FAST_PATH || + decision.decision_source == KEYSTONE_DECISION_SOURCE_MEASURED || + decision.decision_source == KEYSTONE_DECISION_SOURCE_CACHE); keystone_anchor_table_destroy(table); free(items);