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2013514f7b58fb4dc56dcca99f6823f58f4b3131
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23 Commits

Author SHA1 Message Date
Moe Charm (CI)
2013514f7b Working state before pushing to cyu remote 2025-12-19 03:45:01 +09:00
Moe Charm (CI)
e9b97e9d8e Phase 74-1/74-2: UnifiedCache LOCALIZE optimization (P1 frozen, NEUTRAL -0.87%) 
Phase 74-1 (ENV-gated LOCALIZE):
- Result: +0.50% (NEUTRAL)
- Runtime branch overhead caused instructions/branches to increase
- Diagnosed: Branch tax dominates intended optimization

Phase 74-2 (compile-time LOCALIZE):
- Result: -0.87% (NEUTRAL, P1 frozen)
- Removed runtime branch → instructions -0.6%, branches -2.3% ✓
- But cache-misses +86% (register pressure/spill) → net loss
- Conclusion: LOCALIZE本体 works, but fragile to cache effects

Key finding:
- Dependency chain reduction (LOCALIZE) has low ROI due to cache-miss sensitivity
- P1 (LOCALIZE) frozen at default OFF
- Next: Phase 74-3 (P0: FASTAPI) - move branches outside hot loop

Files:
- core/hakmem_build_flags.h: HAKMEM_TINY_UC_LOCALIZE_COMPILED flag
- core/box/tiny_unified_cache_hitpath_env_box.h: ENV gate (frozen)
- core/front/tiny_unified_cache.h: compile-time #if blocks
- docs/analysis/PHASE74_*: Design, instructions, results
- CURRENT_TASK.md: P1 frozen, P0 next instructions

Also includes:
- Phase 69 refill tuning results (archived docs)
- PERFORMANCE_TARGETS_SCORECARD.md: Phase 69 baseline update
- PHASE70_REFILL_OBSERVABILITY_PREREQS_SSOT.md: Route banner docs

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
 2025-12-18 07:47:44 +09:00
Moe Charm (CI)
84f5034e45 Phase 68: PGO training set diversification (seed/WS expansion) 
Changes:
- scripts/box/pgo_fast_profile_config.sh: Expanded WS patterns (3→5) and seeds (1→3)
  for reduced overfitting and better production workload representativeness
- PERFORMANCE_TARGETS_SCORECARD.md: Phase 68 baseline promoted (61.614M = 50.93%)
- CURRENT_TASK.md: Phase 68 marked complete, Phase 67a (layout tax forensics) set Active

Results:
- 10-run verification: +1.19% vs Phase 66 baseline (GO, >+1.0% threshold)
- M1 milestone: 50.93% of mimalloc (target 50%, exceeded by +0.93pp)
- Stability: 10-run mean/median with <2.1% CV

🤖 Generated with Claude Code

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-17 21:08:17 +09:00
Moe Charm (CI)
b7085c47e1 Phase 35-39: FAST build optimization complete (+7.13% cumulative) 
Phase 35-A: BENCH_MINIMAL gate function elimination (GO +4.39%)
- tiny_front_v3_enabled() → constant true
- tiny_metadata_cache_enabled() → constant 0
- learner_v7_enabled() → constant false
- small_learner_v2_enabled() → constant false

Phase 36: Policy snapshot init-once (GO +0.71%)
- small_policy_v7_snapshot() version check skip in BENCH_MINIMAL
- TLS cache for policy snapshot

Phase 37: Standard TLS cache (NO-GO -0.07%)
- TLS cache for Standard build attempted
- Runtime gate overhead negates benefit

Phase 38: FAST/OBSERVE/Standard workflow established
- make perf_fast, make perf_observe targets
- Scorecard and documentation updates

Phase 39: Hot path gate constantization (GO +1.98%)
- front_gate_unified_enabled() → constant 1
- alloc_dualhot_enabled() → constant 0
- g_bench_fast_front, g_v3_enabled blocks → compile-out
- free_dispatch_stats_enabled() → constant false

Results:
- FAST v3: 56.04M ops/s (47.4% of mimalloc)
- Standard: 53.50M ops/s (45.3% of mimalloc)
- M1 target (50%): 5.5% remaining

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
 2025-12-16 15:01:56 +09:00
Moe Charm (CI)
506e724c3b 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
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
 2025-12-16 07:31:15 +09:00
Moe Charm (CI)
f99ef77ad7 Phase 29: Pool Hotbox v2 Stats Prune - NO-OP (infrastructure ready) 
Target: g_pool_hotbox_v2_stats atomics (12 total) in Pool v2
Result: 0.00% impact (code path inactive by default, ENV-gated)
Verdict: NO-OP - Maintain compile-out for future-proofing

Audit Results:
- Classification: 12/12 TELEMETRY (100% observational)
- Counters: alloc_calls, alloc_fast, alloc_refill, alloc_refill_fail,
  alloc_fallback_v1, free_calls, free_fast, free_fallback_v1,
  page_of_fail_* (4 failure counters)
- Verification: All stats/logging only, zero flow control usage
- Phase 28 lesson applied: Traced all usages, confirmed no CORRECTNESS

Key Finding: Pool v2 OFF by default
- Requires HAKMEM_POOL_V2_ENABLED=1 to activate
- Benchmark never executes Pool v2 code paths
- Compile-out has zero performance impact (code never runs)

Implementation (future-ready):
- Added HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED (default: 0)
- Wrapped 13 atomic write sites in core/hakmem_pool.c
- Pattern: #if HAKMEM_POOL_HOTBOX_V2_STATS_COMPILED ... #endif
- Expected impact if Pool v2 enabled: +0.3~0.8% (HOT+WARM atomics)

A/B Test Results:
- Baseline (COMPILED=0): 52.98 M ops/s (±0.43M, 0.81% stdev)
- Research (COMPILED=1): 53.31 M ops/s (±0.80M, 1.50% stdev)
- Delta: -0.62% (noise, not real effect - code path not active)

Critical Lesson Learned (NEW):
Phase 29 revealed ENV-gated features can appear on hot paths but never
execute. Updated audit checklist:
1. Classify atomics (CORRECTNESS vs TELEMETRY)
2. Verify no flow control usage
3. NEW: Verify code path is ACTIVE in benchmark (check ENV gates)
4. Implement compile-out
5. A/B test

Verification methods added to documentation:
- rg "getenv.*FEATURE" to check ENV gates
- perf record/report to verify execution
- Debug printf for quick validation

Cumulative Progress (Phase 24-29):
- 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 (inactive code path)
- Total: 17 atomics removed, +2.74% improvement

Documentation:
- PHASE29_POOL_HOTBOX_V2_AUDIT.md: Complete audit with TELEMETRY classification
- PHASE29_POOL_HOTBOX_V2_STATS_RESULTS.md: Results + new lesson learned
- ATOMIC_PRUNE_CUMULATIVE_SUMMARY.md: Updated with Phase 29 + new checklist
- PHASE29_COMPLETE.md: Completion summary with recommendations

Decision: Keep compile-out despite NO-OP
- Code cleanliness (binary size reduction)
- Future-proofing (ready when Pool v2 enabled)
- Consistency with Phase 24-28 pattern

Generated with Claude Code
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
 2025-12-16 06:33:41 +09:00
Moe Charm (CI)
8052e8b320 Phase 24-26: Hot path atomic telemetry prune (+2.00% cumulative) 
Summary:
- Phase 24 (alloc stats): +0.93% GO
- Phase 25 (free stats): +1.07% GO
- Phase 26 (diagnostics): -0.33% NEUTRAL (code cleanliness)
- Total: 11 atomics compiled-out, +2.00% improvement

Phase 24: OBSERVE tax prune (tiny_class_stats_box.h)
- Added HAKMEM_TINY_CLASS_STATS_COMPILED (default: 0)
- Wrapped 5 stats functions: uc_miss, warm_hit, shared_lock, tls_carve_*
- Result: +0.93% (baseline 56.675M vs compiled-in 56.151M ops/s)

Phase 25: Tiny free stats prune (tiny_superslab_free.inc.h)
- Added HAKMEM_TINY_FREE_STATS_COMPILED (default: 0)
- Wrapped g_free_ss_enter atomic in free hot path
- Result: +1.07% (baseline 57.017M vs compiled-in 56.415M ops/s)

Phase 26: Hot path diagnostic atomics prune
- Added 5 compile gates for low-frequency error counters:
  - HAKMEM_TINY_C7_FREE_COUNT_COMPILED
  - HAKMEM_TINY_HDR_MISMATCH_LOG_COMPILED
  - HAKMEM_TINY_HDR_META_MISMATCH_COMPILED
  - HAKMEM_TINY_METRIC_BAD_CLASS_COMPILED
  - HAKMEM_TINY_HDR_META_FAST_COMPILED
- Result: -0.33% NEUTRAL (within noise, kept for cleanliness)

Alignment with mimalloc principles:
- "No atomics on hot path" - telemetry moved to compile-time opt-in
- Fixed per-op tax elimination
- Production builds: maximum performance (atomics compiled-out)
- Research builds: full diagnostics (COMPILED=1)

Generated with Claude Code
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Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
 2025-12-16 05:35:11 +09:00
Moe Charm (CI)
df37baa505 Phase 1A3: tiny_region_id_write_header always_inline research box (NO-GO) 
Add HAKMEM_TINY_HEADER_WRITE_ALWAYS_INLINE build flag (default 0) to enable
always_inline on tiny_region_id_write_header().

A/B Results (HAKMEM_TINY_HEADER_WRITE_ALWAYS_INLINE=0 vs 1):
- Mixed (10-run): 49.53M → 47.55M ops/s (-4.00% regression)
- C6-heavy (5-run): 23.49M → 24.93M ops/s (+6.00% improvement)

Decision: NO-GO - Mixed regression (-4%) exceeds threshold (-1%)
Status: Frozen as research box (default OFF)

Root Cause: I-cache pressure from forced inline expansion
- Mixed workload: higher code diversity → I-cache evictions
- C6-heavy workload: focused pattern → benefits from inlining

Patches:
1. core/hakmem_build_flags.h: Add HAKMEM_TINY_HEADER_WRITE_ALWAYS_INLINE (default 0)
2. core/tiny_region_id.h: Add conditional __attribute__((always_inline)) gate

Build: make -j EXTRA_CFLAGS=-DHAKMEM_TINY_HEADER_WRITE_ALWAYS_INLINE=1 [target]

Recommendation: Keep compiler's natural inline heuristic (already optimal for Mixed)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>
 2025-12-13 15:31:08 +09:00
Moe Charm (CI)
1cdc932fca Performance Optimization: Release Build Hygiene (Priority 1-4) 
Implement 4 targeted optimizations for release builds:

1. **Remove freelist validation from release builds** (Priority 1)
   - Guard registry lookup on every freelist node with #if !HAKMEM_BUILD_RELEASE
   - Expected gain: +15-20% throughput (eliminates 30-40% of refill cycles)
   - File: core/front/tiny_unified_cache.c:501-529

2. **Optimize PageFault telemetry** (Priority 2)
   - Already properly gated with HAKMEM_DEBUG_COUNTERS
   - No change needed (verified correct implementation)

3. **Make warm pool stats compile-time gated** (Priority 3)
   - Guard all stats recording with #if HAKMEM_DEBUG_COUNTERS
   - File: core/box/warm_pool_stats_box.h:25-51

4. **Reduce warm pool prefill lock overhead** (Priority 4)
   - Reduced WARM_POOL_PREFILL_BUDGET from 3 to 2 SuperSlabs
   - Balances prefill lock overhead with pool depletion frequency
   - File: core/box/warm_pool_prefill_box.h:28

5. **Disable debug counters by default in release builds** (Supporting)
   - Modified HAKMEM_DEBUG_COUNTERS to auto-detect based on NDEBUG
   - File: core/hakmem_build_flags.h:33-40

Benchmark Results (1M allocations, ws=256):
- Before: 4.02-4.2M ops/s (with diagnostic overhead)
- After: 4.04-4.2M ops/s (release build optimized)
- Warm pool hit rate: Maintained at 55.6%
- No performance regressions detected

Expected Impact After Compilation:
- With -DHAKMEM_BUILD_RELEASE=1 and -DNDEBUG:
  - Freelist validation: compiled out completely
  - Debug counters: compiled out completely
  - Telemetry: compiled out completely
  - Stats recording: compiled out (single (void) statement remains)
  - Expected +15-25% improvement in release builds

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-12-05 06:16:12 +09:00
Moe Charm (CI)
94f9ea5104 Implement Phase 1: TLS SuperSlab Hint Box for Headerless performance 
Design: Cache recently-used SuperSlab references in TLS to accelerate
ptr→SuperSlab resolution in Headerless mode free() path.

## Implementation

### New Box: core/box/tls_ss_hint_box.h
- Header-only Box (4-slot FIFO cache per thread)
- Functions: tls_ss_hint_init(), tls_ss_hint_update(), tls_ss_hint_lookup(), tls_ss_hint_clear()
- Memory overhead: 112 bytes per thread (negligible)
- Statistics API for debug builds (hit/miss counters)

### Integration Points

1. **Free path** (core/hakmem_tiny_free.inc):
   - Lines 477-481: Fast path hint lookup before hak_super_lookup()
   - Lines 550-555: Second lookup location (fallback path)
   - Expected savings: 10-50 cycles → 2-5 cycles on cache hit

2. **Allocation path** (core/tiny_superslab_alloc.inc.h):
   - Lines 115-122: Linear allocation return path
   - Lines 179-186: Freelist allocation return path
   - Cache update on successful allocation

3. **TLS variable** (core/hakmem_tiny_tls_state_box.inc):
   - `__thread TlsSsHintCache g_tls_ss_hint = {0};`

### Build System

- **Build flag** (core/hakmem_build_flags.h):
  - HAKMEM_TINY_SS_TLS_HINT (default: 0, disabled)
  - Validation: requires HAKMEM_TINY_HEADERLESS=1

- **Makefile**:
  - Removed old ss_tls_hint_box.o (conflicting implementation)
  - Header-only design eliminates compiled object files

### Testing

- **Unit tests** (tests/test_tls_ss_hint.c):
  - 6 test functions covering init, lookup, FIFO rotation, duplicates, clear, stats
  - All tests PASSING

- **Build validation**:
  - ✅ Compiles with hint disabled (default)
  - ✅ Compiles with hint enabled (HAKMEM_TINY_SS_TLS_HINT=1)

### Documentation

- **Benchmark report** (docs/PHASE1_TLS_HINT_BENCHMARK.md):
  - Implementation summary
  - Build validation results
  - Benchmark methodology (to be executed)
  - Performance analysis framework

## Expected Performance

- **Hit rate**: 85-95% (single-threaded), 70-85% (multi-threaded)
- **Cycle savings**: 80-95% on cache hit (10-50 cycles → 2-5 cycles)
- **Target improvement**: 15-20% throughput increase vs Headerless baseline
- **Memory overhead**: 112 bytes per thread

## Box Theory

**Mission**: Cache hot SuperSlabs to avoid global registry lookup

**Boundary**: ptr → SuperSlab* or NULL (miss)

**Invariant**: hint.base ≤ ptr < hint.end → hit is valid

**Fallback**: Always safe to miss (triggers hak_super_lookup)

**Thread Safety**: TLS storage, no synchronization required

**Risk**: Low (read-only cache, fail-safe fallback, magic validation)

## Next Steps

1. Run full benchmark suite (sh8bench, cfrac, larson)
2. Measure actual hit rate with stats enabled
3. If performance target met (15-20% improvement), enable by default
4. Consider increasing cache slots if hit rate < 80%

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-12-03 18:06:24 +09:00
Moe Charm (CI)
c2716f5c01 Implement Phase 2: Headerless Allocator Support (Partial) 
- Feature: Added HAKMEM_TINY_HEADERLESS toggle (A/B testing)
- Feature: Implemented Headerless layout logic (Offset=0)
- Refactor: Centralized layout definitions in tiny_layout_box.h
- Refactor: Abstracted pointer arithmetic in free path via ptr_conversion_box.h
- Verification: sh8bench passes in Headerless mode (No TLS_SLL_HDR_RESET)
- Known Issue: Regression in Phase 1 mode due to blind pointer conversion logic
 2025-12-03 12:11:27 +09:00
Moe Charm (CI)
0558a9391d Fix: Enable SuperSlab backend by default to resolve OOM. 
Previously,  was not defined at compile-time,
disabling the SuperSlab backend's fallback to the legacy path and causing OOMs.
This commit sets  to 1 in
and ensures its inclusion in .
 2025-11-30 15:08:45 +09:00
Moe Charm (CI)
6f8742582b Phase 5-Step3: Mid/Large Config Box (future workload optimization) 
Add compile-time configuration for Mid/Large allocation paths using Box pattern.

Implementation:
- Created core/box/mid_large_config_box.h
- Dual-mode config: PGO (compile-time) vs Normal (runtime)
- Replace HAK_ENABLED_* checks with MID_LARGE_* macros
- Dead code elimination when HAKMEM_MID_LARGE_PGO=1

Target Checks Eliminated (PGO mode):
- MID_LARGE_BIGCACHE_ENABLED (BigCache for 2MB+ allocations)
- MID_LARGE_ELO_ENABLED (ELO learning/threshold)
- MID_LARGE_ACE_ENABLED (ACE allocator gate)
- MID_LARGE_EVOLUTION_ENABLED (Evolution sampling)

Files:
- core/box/mid_large_config_box.h (NEW) - Config Box pattern
- core/hakmem_build_flags.h - Add HAKMEM_MID_LARGE_PGO flag
- core/box/hak_alloc_api.inc.h - Replace 2 checks (ELO, BigCache)
- core/box/hak_free_api.inc.h - Replace 2 checks (BigCache)

Performance Impact:
- Current workloads (16B-8KB): No effect (checks not in hot path)
- Future workloads (2MB+): Expected +2-4% via dead code elimination

Box Pattern: ✅ Single responsibility, clear contract, testable

Note: Config Box infrastructure ready for future large allocation benchmarks.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-11-29 14:39:07 +09:00
Moe Charm (CI)
e0aa51dba1 Phase 4-Step3: Add Front Config Box (+2.7-4.9% dead code elimination) 
Implement compile-time configuration system for dead code elimination in Tiny
allocation hot paths. The Config Box provides dual-mode configuration:
- Normal mode: Runtime ENV checks (backward compatible, flexible)
- PGO mode: Compile-time constants (dead code elimination, performance)

PERFORMANCE:
- Baseline (runtime config): 50.32 M ops/s (avg of 5 runs)
- Config Box (PGO mode): 52.77 M ops/s (avg of 5 runs)
- Improvement: +2.45 M ops/s (+4.87% with outlier, +2.72% without)
- Target: +5-8% (partially achieved)

IMPLEMENTATION:

1. core/box/tiny_front_config_box.h (NEW):
   - Defines TINY_FRONT_*_ENABLED macros for all config checks
   - PGO mode (#if HAKMEM_TINY_FRONT_PGO): Macros expand to constants (0/1)
   - Normal mode (#else): Macros expand to function calls
   - Functions remain in their original locations (no code duplication)

2. core/hakmem_build_flags.h:
   - Added HAKMEM_TINY_FRONT_PGO build flag (default: 0, off)
   - Documentation: Usage with make EXTRA_CFLAGS="-DHAKMEM_TINY_FRONT_PGO=1"

3. core/box/hak_wrappers.inc.h:
   - Replaced front_gate_unified_enabled() with TINY_FRONT_UNIFIED_GATE_ENABLED
   - 2 call sites updated (malloc and free fast paths)
   - Added config box include

EXPECTED DEAD CODE ELIMINATION (PGO mode):
  if (TINY_FRONT_UNIFIED_GATE_ENABLED) { ... }
  → if (1) { ... }  // Constant, always true
  → Compiler optimizes away the branch, keeps body

SCOPE:
  Currently only front_gate_unified_enabled() is replaced (2 call sites).
  To achieve full +5-8% target, expand to other config checks:
  - ultra_slim_mode_enabled()
  - tiny_heap_v2_enabled()
  - sfc_cascade_enabled()
  - tiny_fastcache_enabled()
  - tiny_metrics_enabled()
  - tiny_diag_enabled()

BUILD USAGE:
  Normal mode (runtime config, default):
    make bench_random_mixed_hakmem

  PGO mode (compile-time config, dead code elimination):
    make EXTRA_CFLAGS="-DHAKMEM_TINY_FRONT_PGO=1" bench_random_mixed_hakmem

BOX PATTERN COMPLIANCE:
✅ Single Responsibility: Configuration management ONLY
✅ Clear Contract: Dual-mode (PGO = constants, Normal = runtime)
✅ Observable: Config report function (debug builds)
✅ Safe: Backward compatible (default is normal mode)
✅ Testable: Easy A/B comparison (PGO vs normal builds)

WHY +2.7-4.9% (below +5-8% target)?
- Limited scope: Only 2 call sites for 1 config function replaced
- Lazy init overhead: front_gate_unified_enabled() cached after first call
- Need to expand to more config checks for full benefit

NEXT STEPS:
- Expand config macro usage to other functions (optional)
- OR proceed with PGO re-enablement (Final polish)

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-11-29 12:18:37 +09:00
Moe Charm (CI)
90c7f148fc Larson Fix: Increase batch refill from 64 to 128 blocks to reduce lock contention 
Root Cause (identified via perf profiling):
- shared_pool_acquire_slab() consumed 85% CPU (lock contention)
- 19,372 locks/sec (1 lock per ~10 allocations)
- Only ~64 blocks carved per SuperSlab refill → frequent lock acquisitions

Fix Applied:
1. Increased HAKMEM_TINY_REFILL_DEFAULT from 64 → 128 blocks
2. Added larson targets to Pool TLS auto-enable in build.sh
3. Increased refill max ceiling from 256 → 512 (allows future tuning)

Expected Impact:
- Lock frequency: 19K → ~1.6K locks/sec (12x reduction)
- Target performance: 0.74M → ~3-5M ops/sec (4-7x improvement)

Known Issues:
- Multi-threaded Larson (>1 thread) has pre-existing crash bug (NOT caused by this change)
- Verified: Original code also crashes with >1 thread
- Single-threaded Larson works fine: ~480-792K ops/sec
- Root cause: "Node pool exhausted for class 7" → requires separate investigation

Files Modified:
- core/hakmem_build_flags.h: HAKMEM_TINY_REFILL_DEFAULT 64→128
- build.sh: Enable Pool TLS for larson targets

Related:
- Task agent report: LARSON_CATASTROPHIC_SLOWDOWN_ROOT_CAUSE.md
- Priority 1 fix from 4-step optimization plan

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-11-14 22:09:14 +09:00
Moe Charm (CI)
696aa7c0b9 CRITICAL FIX: Restore mincore() safety checks in classify_ptr() and free wrapper 
Root Cause:
- Phase 9 gutted hak_is_memory_readable() to always return 1 (unsafe!)
- classify_ptr() Step 3 and free wrapper AllocHeader dispatch both relied on this
- Result: SEGV when freeing external pointers (e.g. 0x5555... executable area)
- Crash: hdr->magic dereference at unmapped memory (page boundary crossing)

Fix (2-file, minimal patch):
1. core/box/front_gate_classifier.c (Line 211-230):
   - REMOVED unsafe AllocHeader probe from classify_ptr()
   - Return PTR_KIND_UNKNOWN immediately after registry lookups fail
   - Let free wrapper handle unknown pointers safely

2. core/box/hak_free_api.inc.h (Line 194-211):
   - RESTORED real mincore() check before AllocHeader dereference
   - Check BOTH pages if header crosses page boundary (40-byte header)
   - Only dereference hdr->magic if memory is verified mapped

Verification:
- ws=4096 benchmark: 10/10 runs passed (was: 100% crash)
- Exit code: 0 (was: 139/SIGSEGV)
- Crash location: eliminated (was: classify_ptr+298, hdr->magic read)

Performance Impact:
- Minimal (only affects unknown pointers, rare case)
- mincore() syscall only when ptr NOT in Pool/SuperSlab registries

Files Changed:
- core/box/front_gate_classifier.c (+20 simplified, -30 unsafe)
- core/box/hak_free_api.inc.h (+16 mincore check)
 2025-11-14 06:09:02 +09:00
Moe Charm (CI)
030132f911 Phase 10: TLS/SFC aggressive cache tuning (syscall reduction failed) 
Goal: Reduce backend transitions by increasing frontend hit rate
Result: +2% best case, syscalls unchanged (root cause: SuperSlab churn)

Implementation:

1. Cache capacity expansion (2-8x per-class)
   - Hot classes (C0-C3): 4x increase (512 slots)
   - Medium classes (C4-C6): 2-3x increase
   - Class 7 (1KB): 2x increase (128 slots)
   - Fast cache: 2x default capacity

2. Refill batch size increase (4-8x)
   - Global default: 16 → 64 (4x)
   - Hot classes: 128 (8x) via HAKMEM_TINY_REFILL_COUNT_HOT
   - Mid classes: 96 (6x) via HAKMEM_TINY_REFILL_COUNT_MID
   - Class 7: 64 → 128 (2x)
   - SFC refill: 64 → 128 (2x)

3. Adaptive sizing aggressive parameters
   - Grow threshold: 80% → 70% (expand earlier)
   - Shrink threshold: 20% → 10% (shrink less)
   - Growth rate: 2x → 1.5x (smoother growth)
   - Max capacity: 2048 → 4096 (2x ceiling)
   - Adapt frequency: Every 10 → 5 refills (more responsive)

Performance Results (100K iterations):

Before (Phase 9):
- Performance: 9.71M ops/s
- Syscalls: 1,729 (mmap:877, munmap:852)

After (Phase 10):
- Default settings: 8.77M ops/s (-9.7%) ⚠️
- Optimal ENV: 9.89M ops/s (+2%) ✅
- Syscalls: 1,729 (unchanged) ❌

Optimal ENV configuration:
export HAKMEM_TINY_REFILL_COUNT_HOT=256
export HAKMEM_TINY_REFILL_COUNT_MID=192

Root Cause Analysis:

Bottleneck is NOT TLS/SFC hit rate, but SuperSlab allocation churn:
- 877 SuperSlabs allocated (877MB via mmap)
- Phase 9 LRU cache not utilized (no frees during benchmark)
- All SuperSlabs retained until program exit
- System malloc: 9 syscalls vs HAKMEM: 1,729 syscalls (192x gap)

Conclusion:

TLS/SFC tuning cannot solve SuperSlab allocation policy problem.
Next step: Phase 11 SuperSlab Prewarm strategy to eliminate
mmap/munmap during benchmark execution.

ChatGPT review: Strategy validated, Option A (Prewarm) recommended.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-11-13 14:25:54 +09:00
Moe Charm (CI)
862e8ea7db Infrastructure and build updates 
- Update build configuration and flags
- Add missing header files and dependencies
- Update TLS list implementation with proper scoping
- Fix various compilation warnings and issues
- Update debug ring and tiny allocation infrastructure
- Update benchmark results documentation

Co-authored-by: factory-droid[bot] <138933559+factory-droid[bot]@users.noreply.github.com>
 2025-11-11 21:49:05 +09:00
HakmemBot
5b31629650 tiny: fix TLS list next_off scope; default TLS_LIST=1; add sentinel guards; header-aware TLS ops; release quiet for benches 2025-11-11 10:00:36 +09:00
Moe Charm (CI)
0da9f8cba3 Phase 7 + Pool TLS 1.5b stabilization:\n- Add build hygiene (dep tracking, flag consistency, print-flags)\n- Add build.sh + verify_build.sh (unified recipe, freshness check)\n- Quiet verbose logs behind HAKMEM_DEBUG_VERBOSE\n- A/B free safety via HAKMEM_TINY_SAFE_FREE (mincore strict vs boundary)\n- Tweak Tiny header path to reduce noise; Pool TLS free guard optimized\n- Fix mimalloc link retention (--no-as-needed + force symbol)\n- Add docs/BUILD_PHASE7_POOL_TLS.md (cheatsheet) 2025-11-09 11:50:18 +09:00
Moe Charm (CI)
7975e243ee Phase 7 Task 3: Pre-warm TLS cache (+180-280% improvement!) 
MAJOR SUCCESS: HAKMEM now achieves 85-92% of System malloc on tiny
allocations (128-512B) and BEATS System at 146% on 1024B allocations!

Performance Results:
- Random Mixed 128B: 21M → 59M ops/s (+181%) 🚀
- Random Mixed 256B: 19M → 70M ops/s (+268%) 🚀
- Random Mixed 512B: 21M → 68M ops/s (+224%) 🚀
- Random Mixed 1024B: 21M → 65M ops/s (+210%, 146% of System!) 🏆
- Larson 1T: 2.68M ops/s (stable, no regression)

Implementation:
1. Task 3a: Remove profiling overhead in release builds
   - Wrapped RDTSC calls in #if !HAKMEM_BUILD_RELEASE
   - Compiler can eliminate profiling code completely
   - Effect: +2% (2.68M → 2.73M Larson)

2. Task 3b: Simplify refill logic
   - Use constants from hakmem_build_flags.h
   - TLS cache already optimal
   - Effect: No regression

3. Task 3c: Pre-warm TLS cache (GAME CHANGER!)
   - Pre-allocate 16 blocks per class at init
   - Eliminates cold-start penalty
   - Effect: +180-280% improvement 🚀

Root Cause:
The bottleneck was cold-start, not the hot path! First allocation in
each class triggered a SuperSlab refill (100+ cycles). Pre-warming
eliminated this penalty, revealing Phase 7's true potential.

Files Modified:
- core/hakmem_tiny.c: Pre-warm function implementation
- core/box/hak_core_init.inc.h: Pre-warm initialization call
- core/tiny_alloc_fast.inc.h: Profiling overhead removal
- core/hakmem_phase7_config.h: Task 3 constants (NEW)
- core/hakmem_build_flags.h: Phase 7 feature flags
- Makefile: PREWARM_TLS flag, phase7 targets
- CLAUDE.md: Phase 7 success summary
- PHASE7_TASK3_RESULTS.md: Comprehensive results report (NEW)

Build:
make HEADER_CLASSIDX=1 AGGRESSIVE_INLINE=1 PREWARM_TLS=1 phase7-bench

🎉 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-11-08 12:54:52 +09:00
Moe Charm (CI)
1da8754d45 CRITICAL FIX: TLS 未初期化による 4T SEGV を完全解消 
**問題:**
- Larson 4T で 100% SEGV (1T は 2.09M ops/s で完走)
- System/mimalloc は 4T で 33.52M ops/s 正常動作
- SS OFF + Remote OFF でも 4T で SEGV

**根本原因: (Task agent ultrathink 調査結果)**
```
CRASH: mov (%r15),%r13
R15 = 0x6261  ← ASCII "ba" (ゴミ値、未初期化TLS)
```

Worker スレッドの TLS 変数が未初期化:
- `__thread void* g_tls_sll_head[TINY_NUM_CLASSES];`  ← 初期化なし
- pthread_create() で生成されたスレッドでゼロ初期化されない
- NULL チェックが通過 (0x6261 != NULL) → dereference → SEGV

**修正内容:**
全 TLS 配列に明示的初期化子 `= {0}` を追加:

1. **core/hakmem_tiny.c:**
   - `g_tls_sll_head[TINY_NUM_CLASSES] = {0}`
   - `g_tls_sll_count[TINY_NUM_CLASSES] = {0}`
   - `g_tls_live_ss[TINY_NUM_CLASSES] = {0}`
   - `g_tls_bcur[TINY_NUM_CLASSES] = {0}`
   - `g_tls_bend[TINY_NUM_CLASSES] = {0}`

2. **core/tiny_fastcache.c:**
   - `g_tiny_fast_cache[TINY_FAST_CLASS_COUNT] = {0}`
   - `g_tiny_fast_count[TINY_FAST_CLASS_COUNT] = {0}`
   - `g_tiny_fast_free_head[TINY_FAST_CLASS_COUNT] = {0}`
   - `g_tiny_fast_free_count[TINY_FAST_CLASS_COUNT] = {0}`

3. **core/hakmem_tiny_magazine.c:**
   - `g_tls_mags[TINY_NUM_CLASSES] = {0}`

4. **core/tiny_sticky.c:**
   - `g_tls_sticky_ss[TINY_NUM_CLASSES][TINY_STICKY_RING] = {0}`
   - `g_tls_sticky_idx[TINY_NUM_CLASSES][TINY_STICKY_RING] = {0}`
   - `g_tls_sticky_pos[TINY_NUM_CLASSES] = {0}`

**効果:**
```
Before: 1T: 2.09M ✅  |  4T: SEGV 💀
After:  1T: 2.41M ✅  |  4T: 4.19M ✅  (+15% 1T, SEGV解消)
```

**テスト:**
```bash
# 1 thread: 完走
./larson_hakmem 2 8 128 1024 1 12345 1
→ Throughput = 2,407,597 ops/s ✅

# 4 threads: 完走（以前は SEGV）
./larson_hakmem 2 8 128 1024 1 12345 4
→ Throughput = 4,192,155 ops/s ✅
```

**調査協力:** Task agent (ultrathink mode) による完璧な根本原因特定

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>
 2025-11-07 01:27:04 +09:00
Moe Charm (CI)
52386401b3 Debug Counters Implementation - Clean History 
Major Features:
- Debug counter infrastructure for Refill Stage tracking
- Free Pipeline counters (ss_local, ss_remote, tls_sll)
- Diagnostic counters for early return analysis
- Unified larson.sh benchmark runner with profiles
- Phase 6-3 regression analysis documentation

Bug Fixes:
- Fix SuperSlab disabled by default (HAKMEM_TINY_USE_SUPERSLAB)
- Fix profile variable naming consistency
- Add .gitignore patterns for large files

Performance:
- Phase 6-3: 4.79 M ops/s (has OOM risk)
- With SuperSlab: 3.13 M ops/s (+19% improvement)

This is a clean repository without large log files.

🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
 2025-11-05 12:31:14 +09:00