2025-12-14 08:11:20 +09:00
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#!/usr/bin/env bash
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set -euo pipefail
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# 10-run Mixed benchmark with explicit clean ENV for frozen/research knobs.
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# Purpose: avoid "bench_setenv_default() does not override exported ENV" drift.
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profile=${HAKMEM_PROFILE:-MIXED_TINYV3_C7_SAFE}
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iters=${ITERS:-20000000}
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ws=${WS:-400}
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runs=${RUNS:-10}
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# Force known research knobs OFF to avoid accidental carry-over.
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export HAKMEM_TINY_HEADER_WRITE_ONCE=${HAKMEM_TINY_HEADER_WRITE_ONCE:-0}
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2025-12-15 00:32:25 +09:00
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export HAKMEM_TINY_C7_PRESERVE_HEADER=${HAKMEM_TINY_C7_PRESERVE_HEADER:-0}
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export HAKMEM_TINY_TCACHE=${HAKMEM_TINY_TCACHE:-0}
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export HAKMEM_TINY_TCACHE_CAP=${HAKMEM_TINY_TCACHE_CAP:-64}
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2025-12-14 08:11:20 +09:00
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export HAKMEM_MALLOC_TINY_DIRECT=${HAKMEM_MALLOC_TINY_DIRECT:-0}
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Phase 16 v1 NEUTRAL, Phase 17 Case B confirmed, Phase 18 design added
## Phase 16 v1: Front FastLane Alloc LEGACY Direct — NEUTRAL (+0.62%)
Target: Reduce alloc-side fixed costs by adding LEGACY direct path to
FastLane entry, mirroring Phase 9/10 free-side winning pattern.
Result: +0.62% on Mixed (below +1.0% GO threshold) → NEUTRAL, freeze as
research box (default OFF).
Critical issue: Initial impl crashed (segfault) for C4-C7. Root cause:
unified_cache_refill() incompatibility. Safety fix: Limited to C0-C3
only (matching existing dualhot pattern).
Files:
- core/box/front_fastlane_alloc_legacy_direct_env_box.{h,c} (new)
- core/box/front_fastlane_box.h (LEGACY direct path, lines 93-119)
- core/bench_profile.h (env refresh sync)
- Makefile (new obj)
- docs/analysis/PHASE16_*.md (design/results/instructions)
ENV: HAKMEM_FRONT_FASTLANE_ALLOC_LEGACY_DIRECT=0 (default OFF, opt-in)
Verdict: Research box frozen. Phase 14-16 plateau confirms dispatch/
routing optimization ROI is exhausted post-Phase-6 FastLane collapse.
---
## Phase 17: FORCE_LIBC Gap Validation — Case B Confirmed
Purpose: Validate "system malloc faster" observation using same-binary
A/B testing to isolate allocator logic差 vs binary layout penalty.
Method:
- Same-binary toggle: HAKMEM_FORCE_LIBC_ALLOC=0/1 (bench_random_mixed_hakmem)
- System binary: bench_random_mixed_system (21K separate binary)
- Perf stat: Hardware counter analysis (I-cache, cycles, instructions)
Result: **Case B confirmed** — Allocator差 negligible, layout penalty dominates.
Gap breakdown (Mixed, 20M iters, ws=400):
- hakmem (FORCE_LIBC=0): 48.12M ops/s
- libc (FORCE_LIBC=1, same binary): 48.31M ops/s → +0.39% (noise level)
- system binary (21K): 83.85M ops/s → +73.57% vs libc, +74.26% vs hakmem
Perf stat (200M iters):
- I-cache misses: 153K (hakmem) → 68K (system) = -55% (smoking gun)
- Cycles: 17.9B → 10.2B = -43%
- Instructions: 41.3B → 21.5B = -48%
- Binary size: 653K → 21K (30x difference)
Root cause: Binary size (30x) causes I-cache thrashing. Code bloat >>
algorithmic efficiency.
Conclusion: Phase 12's "system malloc 1.6x faster" was real, but
misattributed. Gap is layout/I-cache, NOT allocator algorithm.
Files:
- docs/analysis/PHASE17_*.md (results/instructions)
- scripts/run_mixed_10_cleanenv.sh (Phase 9/10 defaults aligned)
Next: Phase 18 Hot Text Isolation (layout optimization, not algorithm opt)
---
## Phase 18: Hot Text Isolation — Design Added
Purpose: Reduce I-cache misses + instruction footprint via layout control
(binary optimization, not allocator algorithm changes).
Strategy (v1 → v2 progression):
v1 (TU split + hot/cold attrs + optional gc-sections):
- Target: +2% throughput (GO threshold, realistic for layout tweaks)
- Secondary: I-cache -10%, instructions -5% (direction confirmation)
- Risk: Low (reversible via build knob)
- Expected: +0-2% (NEUTRAL likely, but validates approach)
v2 (BENCH_MINIMAL compile-out):
- Target: +10-20% throughput (本命)
- Method: Conditional compilation removes stats/ENV/debug from hot path
- Expected: Instruction count -30-40% → significant I-cache improvement
Files:
- docs/analysis/PHASE18_*.md (design/instructions)
- CURRENT_TASK.md (Phase 17 complete, Phase 18 v1/v2 plan)
Build gate: HOT_TEXT_ISOLATION=0/1 (Makefile knob)
Next: Implement Phase 18 v1 (TU split first, BENCH_MINIMAL if v1 NEUTRAL)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
2025-12-15 05:25:47 +09:00
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export HAKMEM_FRONT_FASTLANE_ALLOC_LEGACY_DIRECT=${HAKMEM_FRONT_FASTLANE_ALLOC_LEGACY_DIRECT:-0}
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export HAKMEM_FORCE_LIBC_ALLOC=${HAKMEM_FORCE_LIBC_ALLOC:-0}
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2025-12-14 08:11:20 +09:00
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export HAKMEM_ENV_SNAPSHOT_SHAPE=${HAKMEM_ENV_SNAPSHOT_SHAPE:-0}
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Phase 16 v1 NEUTRAL, Phase 17 Case B confirmed, Phase 18 design added
## Phase 16 v1: Front FastLane Alloc LEGACY Direct — NEUTRAL (+0.62%)
Target: Reduce alloc-side fixed costs by adding LEGACY direct path to
FastLane entry, mirroring Phase 9/10 free-side winning pattern.
Result: +0.62% on Mixed (below +1.0% GO threshold) → NEUTRAL, freeze as
research box (default OFF).
Critical issue: Initial impl crashed (segfault) for C4-C7. Root cause:
unified_cache_refill() incompatibility. Safety fix: Limited to C0-C3
only (matching existing dualhot pattern).
Files:
- core/box/front_fastlane_alloc_legacy_direct_env_box.{h,c} (new)
- core/box/front_fastlane_box.h (LEGACY direct path, lines 93-119)
- core/bench_profile.h (env refresh sync)
- Makefile (new obj)
- docs/analysis/PHASE16_*.md (design/results/instructions)
ENV: HAKMEM_FRONT_FASTLANE_ALLOC_LEGACY_DIRECT=0 (default OFF, opt-in)
Verdict: Research box frozen. Phase 14-16 plateau confirms dispatch/
routing optimization ROI is exhausted post-Phase-6 FastLane collapse.
---
## Phase 17: FORCE_LIBC Gap Validation — Case B Confirmed
Purpose: Validate "system malloc faster" observation using same-binary
A/B testing to isolate allocator logic差 vs binary layout penalty.
Method:
- Same-binary toggle: HAKMEM_FORCE_LIBC_ALLOC=0/1 (bench_random_mixed_hakmem)
- System binary: bench_random_mixed_system (21K separate binary)
- Perf stat: Hardware counter analysis (I-cache, cycles, instructions)
Result: **Case B confirmed** — Allocator差 negligible, layout penalty dominates.
Gap breakdown (Mixed, 20M iters, ws=400):
- hakmem (FORCE_LIBC=0): 48.12M ops/s
- libc (FORCE_LIBC=1, same binary): 48.31M ops/s → +0.39% (noise level)
- system binary (21K): 83.85M ops/s → +73.57% vs libc, +74.26% vs hakmem
Perf stat (200M iters):
- I-cache misses: 153K (hakmem) → 68K (system) = -55% (smoking gun)
- Cycles: 17.9B → 10.2B = -43%
- Instructions: 41.3B → 21.5B = -48%
- Binary size: 653K → 21K (30x difference)
Root cause: Binary size (30x) causes I-cache thrashing. Code bloat >>
algorithmic efficiency.
Conclusion: Phase 12's "system malloc 1.6x faster" was real, but
misattributed. Gap is layout/I-cache, NOT allocator algorithm.
Files:
- docs/analysis/PHASE17_*.md (results/instructions)
- scripts/run_mixed_10_cleanenv.sh (Phase 9/10 defaults aligned)
Next: Phase 18 Hot Text Isolation (layout optimization, not algorithm opt)
---
## Phase 18: Hot Text Isolation — Design Added
Purpose: Reduce I-cache misses + instruction footprint via layout control
(binary optimization, not allocator algorithm changes).
Strategy (v1 → v2 progression):
v1 (TU split + hot/cold attrs + optional gc-sections):
- Target: +2% throughput (GO threshold, realistic for layout tweaks)
- Secondary: I-cache -10%, instructions -5% (direction confirmation)
- Risk: Low (reversible via build knob)
- Expected: +0-2% (NEUTRAL likely, but validates approach)
v2 (BENCH_MINIMAL compile-out):
- Target: +10-20% throughput (本命)
- Method: Conditional compilation removes stats/ENV/debug from hot path
- Expected: Instruction count -30-40% → significant I-cache improvement
Files:
- docs/analysis/PHASE18_*.md (design/instructions)
- CURRENT_TASK.md (Phase 17 complete, Phase 18 v1/v2 plan)
Build gate: HOT_TEXT_ISOLATION=0/1 (Makefile knob)
Next: Implement Phase 18 v1 (TU split first, BENCH_MINIMAL if v1 NEUTRAL)
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
2025-12-15 05:25:47 +09:00
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# NOTE: Phase 9/10 are promoted (bench_profile defaults to 1). Keep cleanenv aligned by default.
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export HAKMEM_FREE_TINY_FAST_MONO_DUALHOT=${HAKMEM_FREE_TINY_FAST_MONO_DUALHOT:-1}
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export HAKMEM_FREE_TINY_FAST_MONO_LEGACY_DIRECT=${HAKMEM_FREE_TINY_FAST_MONO_LEGACY_DIRECT:-1}
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2025-12-14 08:11:20 +09:00
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for i in $(seq 1 "${runs}"); do
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echo "=== Run ${i}/${runs} ==="
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HAKMEM_PROFILE="${profile}" ./bench_random_mixed_hakmem "${iters}" "${ws}" 1 2>&1 | rg "Throughput" || true
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done
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