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Moe Charm (CI) 89a9212700 Phase 83-1 + Allocator Comparison: Switch dispatch fixed (NO-GO +0.32%), PROFILE correction, SCORECARD update

Key changes:
- Phase 83-1: Switch dispatch fixed mode (tiny_inline_slots_switch_dispatch_fixed_box) - NO-GO (marginal +0.32%, branch reduction negligible)
  Reason: lazy-init pattern already optimal, Phase 78-1 pattern shows diminishing returns

- Allocator comparison baseline update (10-run SSOT, WS=400, ITERS=20M):
  tcmalloc: 115.26M (92.33% of mimalloc)
  jemalloc: 97.39M (77.96% of mimalloc)
  system: 85.20M (68.24% of mimalloc)
  mimalloc: 124.82M (baseline)

- hakmem PROFILE correction: scripts/run_mixed_10_cleanenv.sh + run_allocator_quick_matrix.sh
  PROFILE explicitly set to MIXED_TINYV3_C7_SAFE for hakmem measurements
  Result: baseline stabilized to 55.53M (44.46% of mimalloc)
  Previous unstable measurement (35.57M) was due to profile leak

- Documentation:
  * PERFORMANCE_TARGETS_SCORECARD.md: Reference allocators + M1/M2 milestone status
  * PHASE83_1_SWITCH_DISPATCH_FIXED_RESULTS.md: Phase 83-1 analysis (NO-GO)
  * ALLOCATOR_COMPARISON_QUICK_RUNBOOK.md: Quick comparison procedure
  * ALLOCATOR_COMPARISON_SSOT.md: Detailed SSOT methodology

- M2 milestone status: 44.46% (target 55%, gap -10.54pp) - structural improvements needed

🤖 Generated with Claude Code
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

2025-12-18 18:50:00 +09:00

1.8 KiB

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Phase 78-1: Inline Slots Fixed Mode (C3/C4/C5/C6) — Results

Goal

Remove per-operation ENV gate overhead for C3/C4/C5/C6 inline slots by caching the enable decisions at a single boundary (bench_profile refresh), while keeping Box Theory properties:

Single boundary
Reversible via ENV
Fail-fast (no mid-run toggling assumptions)
Minimal observability (perf + throughput)

Change Summary

New box: core/box/tiny_inline_slots_fixed_mode_box.{h,c}
- ENV: HAKMEM_TINY_INLINE_SLOTS_FIXED=0/1 (default 0)
- When enabled, caches:
  - HAKMEM_TINY_C3_INLINE_SLOTS
  - HAKMEM_TINY_C4_INLINE_SLOTS
  - HAKMEM_TINY_C5_INLINE_SLOTS
  - HAKMEM_TINY_C6_INLINE_SLOTS
- Hot path uses tiny_c{3,4,5,6}_inline_slots_enabled_fast().
Integration boundary:
- core/bench_profile.h: calls tiny_inline_slots_fixed_mode_refresh_from_env() after preset putenv defaults.
Hot path call sites migrated:
- core/box/tiny_front_hot_box.h
- core/box/tiny_legacy_fallback_box.h
- core/front/tiny_c{3,4,5,6}_inline_slots.h

A/B Method

Same binary A/B (layout-safe): scripts/run_mixed_10_cleanenv.sh
Workload: Mixed SSOT, ITERS=20000000, WS=400, RUNS=10
Toggle:
- Baseline: HAKMEM_TINY_INLINE_SLOTS_FIXED=0
- Treatment: HAKMEM_TINY_INLINE_SLOTS_FIXED=1

Results (10-run)

Computed via AWK summary:

Baseline (FIXED=0): mean 54.54M ops/s, CV 0.51%
Treatment (FIXED=1): mean 55.80M ops/s, CV 0.57%
Delta: +2.31% ✅

Decision: GO (exceeds +1.0% threshold).

Promotion

For Mixed preset/cleanenv SSOT alignment:

core/bench_profile.h: HAKMEM_TINY_INLINE_SLOTS_FIXED=1 default
scripts/run_mixed_10_cleanenv.sh: HAKMEM_TINY_INLINE_SLOTS_FIXED=1 default

Rollback:

export HAKMEM_TINY_INLINE_SLOTS_FIXED=0

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