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b2e861db12
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Phase 67a: Layout tax forensics foundation (SSOT + measurement box)
Changes:
- scripts/box/layout_tax_forensics_box.sh: New measurement harness
* Baseline vs treatment 10-run throughput comparison
* Automated perf stat collection (cycles, IPC, branches, misses, TLB)
* Binary metadata (size, section info)
* Output to results/layout_tax_forensics/
- docs/analysis/PHASE67A_LAYOUT_TAX_FORENSICS_SSOT.md: Diagnostic reference
* Decision tree: GO/NEUTRAL/NO-GO classification
* Symptom→root-cause mapping (IPC/branch-miss/dTLB/cache-miss)
* Phase 64 case study analysis (IPC 2.05→1.98)
* Operational guidelines for Phase 67b+ optimizations
- CURRENT_TASK.md: Phase 67a marked complete, operational
Outcome:
- Layout tax diagnosis now reproducible in single measurement pass
- Enables fast GO/NO-GO decision for future code removal/reordering attempts
- Foundation for M2 (55% target) structural exploration without regression risk
🤖 Generated with Claude Code
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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2025-12-17 21:09:42 +09:00 |
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84f5034e45
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Phase 68: PGO training set diversification (seed/WS expansion)
Changes:
- scripts/box/pgo_fast_profile_config.sh: Expanded WS patterns (3→5) and seeds (1→3)
for reduced overfitting and better production workload representativeness
- PERFORMANCE_TARGETS_SCORECARD.md: Phase 68 baseline promoted (61.614M = 50.93%)
- CURRENT_TASK.md: Phase 68 marked complete, Phase 67a (layout tax forensics) set Active
Results:
- 10-run verification: +1.19% vs Phase 66 baseline (GO, >+1.0% threshold)
- M1 milestone: 50.93% of mimalloc (target 50%, exceeded by +0.93pp)
- Stability: 10-run mean/median with <2.1% CV
🤖 Generated with Claude Code
Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
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2025-12-17 21:08:17 +09:00 |
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b51b600e8d
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Phase 4-Step1: Add PGO workflow automation (+6.25% performance)
Implemented automated Profile-Guided Optimization workflow using Box pattern:
Performance Improvement:
- Baseline: 57.0 M ops/s
- PGO-optimized: 60.6 M ops/s
- Gain: +6.25% (within expected +5-10% range)
Implementation:
1. scripts/box/pgo_tiny_profile_config.sh - 5 representative workloads
2. scripts/box/pgo_tiny_profile_box.sh - Automated profile collection
3. Makefile PGO targets:
- pgo-tiny-profile: Build instrumented binaries
- pgo-tiny-collect: Collect .gcda profile data
- pgo-tiny-build: Build optimized binaries
- pgo-tiny-full: Complete workflow (profile → collect → build → test)
4. Makefile help target: Added PGO instructions for discoverability
Design:
- Box化: Single responsibility, clear contracts
- Deterministic: Fixed seeds (42) for reproducibility
- Safe: Validation, error detection, timeout protection (30s/workload)
- Observable: Progress reporting, .gcda verification (33 files generated)
Workload Coverage:
- Random mixed: 3 working set sizes (128/256/512 slots)
- Tiny hot: 2 size classes (16B/64B)
- Total: 5 workloads covering hot/cold paths
Documentation:
- PHASE4_STEP1_COMPLETE.md - Completion report
- CURRENT_TASK.md - Phase 4 roadmap (Step 1 complete ✓)
- docs/design/PHASE4_TINY_FRONT_BOX_DESIGN.md - Complete Phase 4 design
Next: Phase 4-Step2 (Hot/Cold Path Box, target +10-15%)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-29 11:28:38 +09:00 |
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