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984cca41ef
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P0 Optimization: Shared Pool fast path with O(1) metadata lookup
Performance Results:
- Throughput: 2.66M ops/s → 3.8M ops/s (+43% improvement)
- sp_meta_find_or_create: O(N) linear scan → O(1) direct pointer
- Stage 2 metadata scan: 100% → 10-20% (80-90% reduction via hints)
Core Optimizations:
1. O(1) Metadata Lookup (superslab_types.h)
- Added `shared_meta` pointer field to SuperSlab struct
- Eliminates O(N) linear search through ss_metadata[] array
- First access: O(N) scan + cache | Subsequent: O(1) direct return
2. sp_meta_find_or_create Fast Path (hakmem_shared_pool.c)
- Check cached ss->shared_meta first before linear scan
- Cache pointer after successful linear scan for future lookups
- Reduces 7.8% CPU hotspot to near-zero for hot paths
3. Stage 2 Class Hints Fast Path (hakmem_shared_pool_acquire.c)
- Try class_hints[class_idx] FIRST before full metadata scan
- Uses O(1) ss->shared_meta lookup for hint validation
- __builtin_expect() for branch prediction optimization
- 80-90% of acquire calls now skip full metadata scan
4. Proper Initialization (ss_allocation_box.c)
- Initialize shared_meta = NULL in superslab_allocate()
- Ensures correct NULL-check semantics for new SuperSlabs
Additional Improvements:
- Updated ptr_trace and debug ring for release build efficiency
- Enhanced ENV variable documentation and analysis
- Added learner_env_box.h for configuration management
- Various Box optimizations for reduced overhead
Thread Safety:
- All atomic operations use correct memory ordering
- shared_meta cached under mutex protection
- Lock-free Stage 2 uses proper CAS with acquire/release semantics
Testing:
- Benchmark: 1M iterations, 3.8M ops/s stable
- Build: Clean compile RELEASE=0 and RELEASE=1
- No crashes, memory leaks, or correctness issues
Next Optimization Candidates:
- P1: Per-SuperSlab free slot bitmap for O(1) slot claiming
- P2: Reduce Stage 2 critical section size
- P3: Page pre-faulting (MAP_POPULATE)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-12-04 16:21:54 +09:00 |
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b1b2ab11c7
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Update CONFIGURATION.md with ENV Cleanup Phase 1-3 results
Added new section "Debug Variables (Gated in Release Builds)" documenting:
- 13 debug variables now compiled out in HAKMEM_BUILD_RELEASE=1
- 4 production config variables preserved (intentional)
- Performance impact: +1.0% (30.2M → 30.5M ops/s)
Updated sections:
- Header: Last Updated 2025-11-28
- Recent Changes: Added Phase 1-3 entry
- FAQ: Added Q&A about gated debug variables
- See Also: Added link to ENV_CLEANUP_TASK.md
Variables documented:
- Core debug: TINY_ALLOC_DEBUG, TINY_PROFILE, WATCH_ADDR
- Trace/timing: PTR_TRACE_*, TIMING
- Freelist: TINY_SLL_DIAG, FREELIST_MASK, SS_FREE_DEBUG
- SuperSlab: SUPER_LOOKUP_DEBUG, SUPER_REG_DEBUG, SS_LRU_DEBUG, SS_PREWARM_DEBUG
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-28 04:22:37 +09:00 |
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f4978b1529
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ENV Cleanup Phase 5: Additional DEBUG guards + doc cleanup
Code changes:
- core/slab_handle.h: Add RELEASE guard for HAKMEM_TINY_FREELIST_MASK
- core/tiny_superslab_free.inc.h: Add guards for HAKMEM_TINY_ROUTE_FREE, HAKMEM_TINY_FREELIST_MASK
Documentation cleanup:
- docs/specs/CONFIGURATION.md: Remove 21 doc-only ENV variables
- docs/specs/ENV_VARS.md: Remove doc-only variables
Testing:
- Build: PASS (305KB binary, unchanged)
- Sanity: PASS (17.22M ops/s average, 3 runs)
- Larson: PASS (52.12M ops/s, 0 crashes)
Impact:
- 2 additional DEBUG ENV variables guarded (no overhead in RELEASE)
- Documentation accuracy improved
- Binary size maintained
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-27 03:55:17 +09:00 |
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a9ddb52ad4
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ENV cleanup: Remove BG/HotMag vars & guard fprintf (Larson 52.3M ops/s)
Phase 1 完了：環境変数整理 + fprintf デバッグガード
ENV変数削除（BG/HotMag系）:
- core/hakmem_tiny_init.inc: HotMag ENV 削除 (~131 lines)
- core/hakmem_tiny_bg_spill.c: BG spill ENV 削除
- core/tiny_refill.h: BG remote 固定値化
- core/hakmem_tiny_slow.inc: BG refs 削除
fprintf Debug Guards (#if !HAKMEM_BUILD_RELEASE):
- core/hakmem_shared_pool.c: Lock stats (~18 fprintf)
- core/page_arena.c: Init/Shutdown/Stats (~27 fprintf)
- core/hakmem.c: SIGSEGV init message
ドキュメント整理:
- 328 markdown files 削除（旧レポート・重複docs）
性能確認:
- Larson: 52.35M ops/s (前回52.8M、安定動作✅)
- ENV整理による機能影響なし
- Debug出力は一部残存（次phase で対応）
🤖 Generated with Claude Code
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-26 14:45:26 +09:00 |
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