ef8e2ab9b5
Phase 59b: Speed-first Mode Baseline Rebase - Rebase on MIXED_TINYV3_C7_SAFE profile (Speed-first, no prewarm suppression) - hakmem: 58.478 M ops/s (CV 2.52%) - mimalloc: 120.979 M ops/s (CV 0.90%) - Ratio: 48.34% of mimalloc (down from 49.13% Balanced mode in Phase 59) - Reason for difference: Profile selection (Speed-first vs Balanced) and mimalloc environment variance - Status: COMPLETE (measurement-only, zero code changes) Phase 61: C7 ULTRA Header-Light Optimization Attempt - Objective: Skip header write on C7 ULTRA alloc hit (write only on refill) - Implementation: ENV gate HAKMEM_TINY_C7_ULTRA_HEADER_LIGHT (default OFF) - Result: +0.31% (NEUTRAL, below +1.0% GO threshold) - Baseline: 59.543 M ops/s (CV 1.53%) - Treatment: 59.729 M ops/s (CV 2.66%) - Root cause analysis: - tiny_region_id_write_header only 2.32% of time (lower than Phase 42 estimate 4.56%) - Header-light mode adds branch to hot path, negating write savings - Mixed workload dilutes C7-specific optimization effectiveness - Variance increased due to branch prediction variability - Decision: Kept as research box with ENV gate (default OFF) - Lesson: Workload-specific optimizations need careful verification with full workloads Updated Documentation: - PHASE59B_SPEED_FIRST_REBASE_RESULTS.md: Full measurement results and analysis - PHASE61_C7_ULTRA_HEADER_LIGHT_RESULTS.md: A/B test results and root cause analysis - PHASE61_C7_ULTRA_HEADER_LIGHT_IMPLEMENTATION.md: Implementation details and design - CURRENT_TASK.md: Updated status and next phase planning (Phase 62) - PERFORMANCE_TARGETS_SCORECARD.md: Updated baseline and M1 milestone status M1 (50%) Milestone Status: - Current: 48.34% (Speed-first profile) - Gap: -1.66% (within measurement noise) - Profile recommendation: Speed-first as canonical default for throughput focus 🤖 Generated with Claude Code Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
Docs Overview
このフォルダは hakmem の設計・計測・運用メモを体系化して管理する場所です。
- INDEX.md: 目次（各ドキュメントへのリンク）
- benchmarks/: ベンチマーク手順とスイープ結果の保存先
- specs/: 現在の仕様（SACS‑3/HW/ENV）を集約
- roadmap/: これからの実装計画・優先度・タスク
運用ルール（提案）
- 1つの変更/計測のまとまりにつき1ファイル（or 1フォルダ）
- 再現コマンド・環境変数・ハード構成は必ず記載
- 大きな連続出力はファイルへ保存し、本文からは抜粋/要約を記載