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506e724c3b
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Phase 30-31: Standard procedure + g_tiny_free_trace atomic prune
Phase 30: Standard Procedure Establishment
- Created 4-step standardized methodology (Step 0-3)
- Step 0: Execution Verification (NEW - Phase 29 lesson)
- Step 1: CORRECTNESS/TELEMETRY Classification (Phase 28 lesson)
- Step 2: Compile-Out Implementation (Phase 24-27 pattern)
- Step 3: A/B Test (build-level comparison)
- Executed audit_atomics.sh: 412 atomics analyzed
- Identified Phase 31 candidate: g_tiny_free_trace (HOT path, TOP PRIORITY)
Phase 31: g_tiny_free_trace Compile-Out (HOT Path TELEMETRY)
- Target: core/hakmem_tiny_free.inc:326 (trace-rate-limit atomic)
- Added HAKMEM_TINY_FREE_TRACE_COMPILED (default: 0)
- Classification: Pure TELEMETRY (trace output only, no flow control)
- A/B Result: NEUTRAL (baseline -0.35% mean, +0.19% median)
- Verdict: NEUTRAL → Adopted for code cleanliness (Phase 26 precedent)
- Rationale: HOT path TELEMETRY removal improves code quality
A/B Test Details:
- Baseline (COMPILED=0): 53.638M ops/s mean, 53.799M median
- Compiled-in (COMPILED=1): 53.828M ops/s mean, 53.697M median
- Conflicting signals within ±0.5% noise margin
- Phase 25 comparison: g_free_ss_enter (+1.07% GO) vs g_tiny_free_trace (NEUTRAL)
- Hypothesis: Rate-limited atomic (128 calls) optimized by compiler
Cumulative Progress (Phase 24-31):
- Phase 24 (class stats): +0.93% GO
- Phase 25 (free stats): +1.07% GO
- Phase 26 (diagnostics): -0.33% NEUTRAL
- Phase 27 (unified cache): +0.74% GO
- Phase 28 (bg spill): NO-OP (all CORRECTNESS)
- Phase 29 (pool v2): NO-OP (ENV-gated)
- Phase 30 (procedure): PROCEDURE
- Phase 31 (free trace): -0.35% NEUTRAL
- Total: 18 atomics removed, +2.74% net improvement
Documentation Created:
- PHASE30_STANDARD_PROCEDURE.md: Complete 4-step methodology
- ATOMIC_AUDIT_FULL.txt: 412 atomics comprehensive audit
- PHASE31_CANDIDATES_HOT/WARM.txt: Priority-sorted candidates
- PHASE31_RECOMMENDED_CANDIDATES.md: TOP 3 with Step 0 verification
- PHASE31_TINY_FREE_TRACE_ATOMIC_PRUNE_RESULTS.md: Complete A/B results
- ATOMIC_PRUNE_CUMULATIVE_SUMMARY.md: Updated (Phase 30-31)
- CURRENT_TASK.md: Phase 32 candidate identified (g_hak_tiny_free_calls)
Key Lessons:
- Lesson 7 (Phase 30): Step 0 execution verification prevents wasted effort
- Lesson 8 (Phase 31): NEUTRAL + code cleanliness = valid adoption
- HOT path ≠ guaranteed performance win (rate-limited atomics may be optimized)
Next Phase: Phase 32 candidate (g_hak_tiny_free_calls)
- Location: core/hakmem_tiny_free.inc:335 (9 lines below Phase 31 target)
- Expected: +0.3~0.7% or NEUTRAL
Generated with Claude Code
https://claude.com/claude-code
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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2025-12-16 07:31:15 +09:00 |
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