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>

docs/analysis/PERFORMANCE_TARGETS_SCORECARD.md

@@ -53,17 +53,60 @@ Note:
 
 | allocator | mean (M ops/s) | median (M ops/s) | ratio vs mimalloc (mean) | CV |
 |----------|-----------------|------------------|--------------------------|-----|
-| **mimalloc (separate)** | **120.979** | 120.967 | **100%** | 0.90% |
-| jemalloc (LD_PRELOAD) | 96.06 | 97.00 | 79.73% | 2.93% |
-| system (separate) | 85.10 | 85.24 | 70.65% | 1.01% |
+| **mimalloc (separate)** | **124.82** | 124.71 | **100%** | 1.10% |
+| **tcmalloc (LD_PRELOAD)** | **115.26** | 115.51 | **92.33%** | 1.22% |
+| **jemalloc (LD_PRELOAD)** | **97.39** | 97.88 | **77.96%** | 1.29% |
+| **system (separate)** | **85.20** | 85.40 | **68.24%** | 1.98% |
 | libc (same binary) | 76.26 | 76.66 | 63.30% | (old) |
 
 Notes:
 - **Phase 59b rebase**: mimalloc updated (120.466M → 120.979M, +0.43% variation)
-- `system/mimalloc/jemalloc` は別バイナリ計測のため **layout（text size/I-cache）差分を含む reference**
+- **2025-12-18 Update (corrected)**: tcmalloc/jemalloc/system 計測完了 (10-run Random Mixed, WS=400, ITERS=20M, SEED=1)
+  - tcmalloc: 115.26M ops/s (92.33% of mimalloc) ✓
+  - jemalloc: 97.39M ops/s (77.96% of mimalloc)
+  - system: 85.20M ops/s (68.24% of mimalloc)
+  - mimalloc: 124.82M ops/s (baseline)
+  - 計測スクリプト: `scripts/run_allocator_quick_matrix.sh` (hakmem via run_mixed_10_cleanenv.sh)
+  - **修正**: hakmem 計測が HAKMEM_PROFILE を明示するように修正 → SSOT レンジ復帰
+- `system/mimalloc/jemalloc/tcmalloc` は別バイナリ計測のため **layout（text size/I-cache）差分を含む reference**
+- `tcmalloc (LD_PRELOAD)` は gperftools から install （`/usr/lib/x86_64-linux-gnu/libtcmalloc_minimal.so`）
 - `libc (same binary)` は `HAKMEM_FORCE_LIBC_ALLOC=1` により、同一レイアウト上での比較の目安（Phase 48 前計測）
 - **mimalloc 比較は FAST build を使用すること**（Standard の gate overhead は hakmem 固有の税）
-- **jemalloc 初回計測**: 79.73% of mimalloc（Phase 59 baseline, system より 9% 速い strong competitor）
+- 比較手順（SSOT）: `docs/analysis/ALLOCATOR_COMPARISON_SSOT.md`
+- **同一バイナリ比較（layout差を最小化）**: `scripts/run_allocator_preload_matrix.sh`（`bench_random_mixed_system` 固定 + `LD_PRELOAD` 差し替え）
+  - 注意: hakmem の SSOT（`bench_random_mixed_hakmem*`）とは経路が異なる（drop-in wrapper reference）
+
+## Allocator Comparison（bench_allocators_compare.sh, small-scale reference）
+
+注意:
+- これは `bench_allocators_*` の `--scenario mixed`（8B..1MB の簡易混合）による **small-scale reference**。
+- Mixed 16–1024B SSOT（`scripts/run_mixed_10_cleanenv.sh`）とは **別物**なので、FAST baseline/マイルストーンとは混同しない。
+
+実行（例）:
+```bash
+make bench
+JEMALLOC_SO=/path/to/libjemalloc.so.2 \
+TCMALLOC_SO=/path/to/libtcmalloc.so \
+scripts/bench_allocators_compare.sh --scenario mixed --iterations 50
+```
+
+結果（2025-12-18, mixed, iterations=50）:
+
+| allocator | ops/sec (M) | vs mimalloc (Phase 69 ref) | vs system | soft_pf | RSS (MB) |
+|----------|--------------|----------------------------|-----------|---------|----------|
+| tcmalloc (LD_PRELOAD) | 34.56 | 28.6% | 11.2x | 3,842 | 21.5 |
+| jemalloc (LD_PRELOAD) | 24.33 | 20.1% | 7.9x | 143 | 3.8 |
+| hakmem (linked) | 16.85 | 13.9% | 5.4x | 4,701 | 46.5 |
+| system (linked) | 3.09 | 2.6% | 1.0x | 68,590 | 19.6 |
+
+補足:
+- `soft_pf`/`RSS` は `getrusage()` 由来（Linux の `ru_maxrss` は KB）。
+
+## Allocator Comparison（Random Mixed, 10-run, WS=400, reference）
+
+注意:
+- 別バイナリ比較は layout tax が混ざる。
+- **同一バイナリ比較（LD_PRELOAD）を優先**したい場合は `scripts/run_allocator_preload_matrix.sh` を使う。
 
 ## 1) Speed（相対目標）
 
@@ -71,14 +114,16 @@ Notes:
 
 推奨マイルストーン（Mixed 16–1024B, FAST build）：
 
-| Milestone | Target | Current (FAST v3 + PGO Phase 69) | Status |
+| Milestone | Target | Current (2025-12-18, corrected) | Status |
 |-----------|--------|-----------------------------------|--------|
-| M1 | mimalloc の **50%** | 51.77% | 🟢 **EXCEEDED** (Phase 69, Warm Pool Size=16, ENV-only) |
-| M2 | mimalloc の **55%** | - | 🔴 未達（残り +3.23pp、Phase 69+ 継続中）|
+| M1 | mimalloc の **50%** | 44.46% | 🟡 **未達** (PROFILE 修正後の計測) |
+| M2 | mimalloc の **55%** | 44.46% | 🔴 **未達** (Gap: -10.54pp)|
 | M3 | mimalloc の **60%** | - | 🔴 未達（構造改造必要）|
 | M4 | mimalloc の **65–70%** | - | 🔴 未達（構造改造必要）|
 
-**現状:** FAST v3 + PGO (Phase 69) = 62.63M ops/s = mimalloc の 51.77%（Warm Pool Size=16, ENV-only, 10-run 検証済み）
+**現状:** hakmem (FAST PGO) (2025-12-18) = 55.53M ops/s = mimalloc の 44.46%（Random Mixed, WS=400, ITERS=20M, 10-run）
+
+⚠️ **重要**: Phase 69 baseline (62.63M = 51.77%) は古い計測条件の可能性。PROFILE 明示修正後の新 baseline は 44.46%（M1 未達）。
 
 **Phase 68 PGO 昇格（Phase 66 → Phase 68 upgrade）:**
 - Phase 66 baseline: 60.89M ops/s = 50.32% (+3.0% mean, 3-run stable)