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707056b765
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feat: Phase 7 + Phase 2 - Massive performance & stability improvements
Performance Achievements:
- Tiny allocations: +180-280% (21M → 59-70M ops/s random mixed)
- Single-thread: +24% (2.71M → 3.36M ops/s Larson)
- 4T stability: 0% → 95% (19/20 success rate)
- Overall: 91.3% of System malloc average (target was 40-55%) ✓
Phase 7 (Tasks 1-3): Core Optimizations
- Task 1: Header validation removal (Region-ID direct lookup)
- Task 2: Aggressive inline (TLS cache access optimization)
- Task 3: Pre-warm TLS cache (eliminate cold-start penalty)
Result: +180-280% improvement, 85-146% of System malloc
Critical Bug Fixes:
- Fix 64B allocation crash (size-to-class +1 for header)
- Fix 4T wrapper recursion bugs (BUG #7, #8, #10, #11)
- Remove malloc fallback (30% → 50% stability)
Phase 2a: SuperSlab Dynamic Expansion (CRITICAL)
- Implement mimalloc-style chunk linking
- Unlimited slab expansion (no more OOM at 32 slabs)
- Fix chunk initialization bug (bitmap=0x00000001 after expansion)
Files: core/hakmem_tiny_superslab.c/h, core/superslab/superslab_types.h
Result: 50% → 95% stability (19/20 4T success)
Phase 2b: TLS Cache Adaptive Sizing
- Dynamic capacity: 16-2048 slots based on usage
- High-water mark tracking + exponential growth/shrink
- Expected: +3-10% performance, -30-50% memory
Files: core/tiny_adaptive_sizing.c/h (new)
Phase 2c: BigCache Dynamic Hash Table
- Migrate from fixed 256×8 array to dynamic hash table
- Auto-resize: 256 → 512 → 1024 → 65,536 buckets
- Improved hash function (FNV-1a) + collision chaining
Files: core/hakmem_bigcache.c/h
Expected: +10-20% cache hit rate
Design Flaws Analysis:
- Identified 6 components with fixed-capacity bottlenecks
- SuperSlab (CRITICAL), TLS Cache (HIGH), BigCache/L2.5 (MEDIUM)
- Report: DESIGN_FLAWS_ANALYSIS.md (11 chapters)
Documentation:
- 13 comprehensive reports (PHASE*.md, DESIGN_FLAWS*.md)
- Implementation guides, test results, production readiness
- Bug fix reports, root cause analysis
Build System:
- Makefile: phase7 targets, PREWARM_TLS flag
- Auto dependency generation (-MMD -MP) for .inc files
Known Issues:
- 4T stability: 19/20 (95%) - investigating 1 failure for 100%
- L2.5 Pool dynamic sharding: design only (needs 2-3 days integration)
🤖 Generated with Claude Code (https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-08 17:08:00 +09:00 |
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6b1382959c
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Phase 7-1 PoC: Region-ID Direct Lookup (+39%~+436% improvement!)
Implemented ultra-fast header-based free path that eliminates SuperSlab
lookup bottleneck (100+ cycles → 5-10 cycles).
## Key Changes
1. **Smart Headers** (core/tiny_region_id.h):
- 1-byte header before each allocation stores class_idx
- Memory layout: [Header: 1B] [User data: N-1B]
- Overhead: <2% average (0% for Slab[0] using wasted padding)
2. **Ultra-Fast Allocation** (core/tiny_alloc_fast.inc.h):
- Write header at base: *base = class_idx
- Return user pointer: base + 1
3. **Ultra-Fast Free** (core/tiny_free_fast_v2.inc.h):
- Read class_idx from header (ptr-1): 2-3 cycles
- Push base (ptr-1) to TLS freelist: 3-5 cycles
- Total: 5-10 cycles (vs 500+ cycles current!)
4. **Free Path Integration** (core/box/hak_free_api.inc.h):
- Removed SuperSlab lookup from fast path
- Direct header validation (no lookup needed!)
5. **Size Class Adjustment** (core/hakmem_tiny.h):
- Max tiny size: 1023B (was 1024B)
- 1024B requests → Mid allocator fallback
## Performance Results
| Size | Baseline | Phase 7 | Improvement |
|------|----------|---------|-------------|
| 128B | 1.22M | 6.54M | **+436%** 🚀 |
| 512B | 1.22M | 1.70M | **+39%** |
| 1023B | 1.22M | 1.92M | **+57%** |
## Build & Test
Enable Phase 7:
make HEADER_CLASSIDX=1 bench_random_mixed_hakmem
Run benchmark:
HAKMEM_TINY_USE_SUPERSLAB=1 ./bench_random_mixed_hakmem 10000 128 1234567
## Known Issues
- 1024B requests fallback to Mid allocator (by design)
- Target 40-60M ops/s not yet reached (current: 1.7-6.5M)
- Further optimization needed (TLS capacity tuning, refill optimization)
## Credits
Design: ChatGPT Pro Ultrathink, Claude Code
Implementation: Claude Code with Task Agent Ultrathink support
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>
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2025-11-08 03:18:17 +09:00 |
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52386401b3
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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>
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2025-11-05 12:31:14 +09:00 |
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