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04186341c1
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Phase 4-Step2: Add Hot/Cold Path Box (+7.3% performance)
Implemented Hot/Cold Path separation using Box pattern for Tiny allocations:
Performance Improvement (without PGO):
- Baseline (Phase 26-A): 53.3 M ops/s
- Hot/Cold Box (Phase 4-Step2): 57.2 M ops/s
- Gain: +7.3% (+3.9 M ops/s)
Implementation:
1. core/box/tiny_front_hot_box.h - Ultra-fast hot path (1 branch)
- Removed range check (caller guarantees valid class_idx)
- Inline cache hit path with branch prediction hints
- Debug metrics with zero overhead in Release builds
2. core/box/tiny_front_cold_box.h - Slow cold path (noinline, cold)
- Refill logic (batch allocation from SuperSlab)
- Drain logic (batch free to SuperSlab)
- Error reporting and diagnostics
3. core/front/malloc_tiny_fast.h - Updated to use Hot/Cold Boxes
- Hot path: tiny_hot_alloc_fast() (1 branch: cache empty check)
- Cold path: tiny_cold_refill_and_alloc() (noinline, cold attribute)
- Clear separation improves i-cache locality
Branch Analysis:
- Baseline: 4-5 branches in hot path (range check + cache check + refill logic mixed)
- Hot/Cold Box: 1 branch in hot path (cache empty check only)
- Reduction: 3-4 branches eliminated from hot path
Design Principles (Box Pattern):
✅ Single Responsibility: Hot path = cache hit only, Cold path = refill/errors
✅ Clear Contract: Hot returns NULL on miss, Cold handles miss
✅ Observable: Debug metrics (TINY_HOT_METRICS_*) gated by NDEBUG
✅ Safe: Branch prediction hints (TINY_HOT_LIKELY/UNLIKELY)
✅ Testable: Isolated hot/cold paths, easy A/B testing
PGO Status:
- Temporarily disabled (build issues with __gcov_merge_time_profile)
- Will re-enable PGO in future commit after resolving gcc/lto issues
- Current benchmarks are without PGO (fair A/B comparison)
Other Changes:
- .gitignore: Added *.d files (dependency files, auto-generated)
- Makefile: PGO targets temporarily disabled (show informational message)
- build_pgo.sh: Temporarily disabled (show "PGO paused" message)
Next: Phase 4-Step3 (Front Config Box, target +5-8%)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-29 11:58:37 +09:00 |
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674965080f
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Build: Add out/ directory to .gitignore
Fix Claude Code performance warning:
- Repository snapshot was tracking 385+ untracked files in out/ directory
- out/ contains build artifacts (binaries, intermediate objects)
- Adding out/ to .gitignore resolves the warning
Impact: Improves Claude Code repository scanning performance
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-22 06:28:53 +09:00 |
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131cdb7b88
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Doc: Add benchmark reports, atomic freelist docs, and .gitignore update
Phase 1 Commit: Comprehensive documentation and build system cleanup
Added Documentation:
- BENCHMARK_SUMMARY_20251122.md: Current performance baseline
- COMPREHENSIVE_BENCHMARK_REPORT_20251122.md: Detailed analysis
- LARSON_SLOWDOWN_INVESTIGATION_REPORT.md: Larson benchmark deep dive
- ATOMIC_FREELIST_*.md (5 files): Complete atomic freelist documentation
- Implementation strategy, quick start, site-by-site guide
- Index and summary for easy navigation
Added Scripts:
- run_comprehensive_benchmark.sh: Automated benchmark runner
- scripts/analyze_freelist_sites.sh: Freelist analysis tool
- scripts/verify_atomic_freelist_conversion.sh: Conversion verification
Build System:
- Updated .gitignore: Added *.d (build dependency files)
- Cleaned up tracked .d files (will be ignored going forward)
Performance Status (2025-11-22):
- Random Mixed 256B: 59.6M ops/s (VERIFIED WORKING)
- Benchmark command: ./out/release/bench_random_mixed_hakmem 10000000 256 42
- Known issue: workset=8192 causes SEGV (to be fixed separately)
Notes:
- bench_random_mixed.c already tracked, working state confirmed
- Ultra SLIM implementation backed up to /tmp/ (Phase 2 restore pending)
- Documentation covers atomic freelist conversion and benchmarking methodology
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-22 06:11:55 +09:00 |
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52386401b3
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Debug Counters Implementation - Clean History
Major Features:
- Debug counter infrastructure for Refill Stage tracking
- Free Pipeline counters (ss_local, ss_remote, tls_sll)
- Diagnostic counters for early return analysis
- Unified larson.sh benchmark runner with profiles
- Phase 6-3 regression analysis documentation
Bug Fixes:
- Fix SuperSlab disabled by default (HAKMEM_TINY_USE_SUPERSLAB)
- Fix profile variable naming consistency
- Add .gitignore patterns for large files
Performance:
- Phase 6-3: 4.79 M ops/s (has OOM risk)
- With SuperSlab: 3.13 M ops/s (+19% improvement)
This is a clean repository without large log files.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-05 12:31:14 +09:00 |
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