Update CURRENT_TASK.md: Phase 6 complete, next phase selection
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Moe Charm (CI)
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# Current Task: Choose Next Phase
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**Date**: 2025-11-29
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**Status**: Phase 5 ✅ COMPLETE → Next phase selection
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**Achievement**: +28.9x improvement for Mid MT allocations (1KB-8KB)
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**Status**: Phase 6 ✅ COMPLETE → Next phase selection
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**Achievement**: Lock-free Mid MT (+2.65% improvement, code quality++)
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---
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## Phase 5 Complete! ✅
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## Phase 6 Complete! ✅
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**Result**: Mid/Large Allocation Optimization **COMPLETE**
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**Performance**: 1.49M → 41.0M ops/s (+28.9x for Mid MT, 1.53x faster than system malloc)
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**Duration**: 1 day (focused execution)
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**Result**: Lock-free Mid MT Allocator **COMPLETE**
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**Performance**: 41.0M → 42.09M ops/s (+2.65% for Mid MT)
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**Duration**: 1 day (quick improvement)
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**Completed Steps**:
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- ✅ Step 1: Mid MT Verification (range bug identified)
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- ✅ Step 2: Mid Free Route Box (+28.9x improvement)
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- ✅ Step 3: Mid/Large Config Box (future workload infrastructure)
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- ⏸️ Step 4: Mid Registry Pre-alloc (deferred, MT workload needed)
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- ✅ Step 5: Documentation (PHASE5_COMPLETION_REPORT.md)
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- ✅ Phase 6-A: Code readability (debug guard around SuperSlab lookup)
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- ✅ Phase 6-B: Header-based Mid MT free (lock-free, -127 lines)
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**See**: `PHASE5_COMPLETION_REPORT.md` for full details
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**See**: `PHASE6A_DISCREPANCY_INVESTIGATION.md` and `PHASE6B_DISCREPANCY_INVESTIGATION.md`
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---
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@ -39,7 +36,7 @@
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**Cons**:
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- May be system noise (not real regression)
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- Workload is Tiny-only (unaffected by Phase 5 changes)
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- Workload is Tiny-only (unaffected by Phase 5/6 changes)
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- Could be time spent on noise instead of real gains
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---
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@ -117,7 +114,7 @@
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**Risk**: High (no MT benchmark exists yet)
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**Pros**:
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- Unlock Phase 5-Step4 (Mid registry pre-allocation)
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- Unlock Phase 5-Step4 (Mid registry pre-allocation, now obsolete with Phase 6-B)
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- Real-world workloads are often MT
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- Could show significant MT scalability gains
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@ -129,7 +126,7 @@
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**Required Work**:
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1. Create MT benchmark (4+ threads, mixed sizes)
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2. Profile MT contention points
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3. Implement registry pre-allocation
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3. Implement remote free (currently memory leak)
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4. Add lock-free structures where needed
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5. Validate MT correctness (TSAN, stress testing)
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@ -196,21 +193,22 @@ Phase 4-Step3 (full): ~55-58 M ops/s (+5-8% expected)
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```
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Phase 3 (mincore removal): 56.8 M ops/s
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Phase 4 (Hot/Cold Box): 57.2 M ops/s (+0.7%)
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Phase 5 (current): 52.3 M ops/s (-8.6% regression)
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Phase 5/6 (current): 52.3 M ops/s (-8.6% regression)
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```
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**Note**: Regression unrelated to Phase 5 (Tiny-only workload, doesn't touch Mid MT)
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**Note**: Regression unrelated to Phase 5/6 (Tiny-only workload, doesn't touch Mid MT)
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### bench_mid_mt_gap (1KB-8KB, Mid MT workload)
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```
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Before Phase 5 (broken): 1.49 M ops/s (mmap fallback)
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After Phase 5 (fixed): 41.0 M ops/s (+28.9x)
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vs System malloc: 26.8 M ops/s (1.53x faster)
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After Phase 6-B (lock-free): 42.09 M ops/s (+2.65%)
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vs System malloc: 26.8 M ops/s (1.57x faster)
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```
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**Achievement**: ✅ Major success!
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**Achievement**: ✅ Major success! Lock-free, simpler code
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### Overall Status
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- ✅ **Tiny allocations** (16B-1KB): 52-57 M ops/s (good, some regression)
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- ✅ **Mid MT allocations** (1KB-8KB): 41 M ops/s (excellent, 1.53x vs system)
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- ✅ **Mid MT allocations** (1KB-8KB): 42 M ops/s (excellent, 1.57x vs system, lock-free)
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- ⏸️ **Large allocations** (32KB-2MB): Not benchmarked yet
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- ⏸️ **MT workloads**: No MT benchmarks yet
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@ -225,11 +223,11 @@ vs System malloc: 26.8 M ops/s (1.53x faster)
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- **Option D**: Production readiness & benchmarking
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- **Option E**: Multi-threaded optimization
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**Or**: Take a break, Phase 5 is a big win! 🎉
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**Or**: Take a break, Phase 5+6 are big wins! 🎉
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---
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Updated: 2025-11-29
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Phase: 5 COMPLETE → 6 PENDING
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Previous: Phase 4 (Tiny Front Optimization, +7.3%)
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Achievement: +28.9x Mid MT improvement (1.49M → 41.0M ops/s)
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Phase: 6 COMPLETE → 7 PENDING
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Previous: Phase 5 (Mid/Large Optimization, +28.9x), Phase 6 (Lock-free Mid MT, +2.65%)
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Achievement: Lock-free Mid MT allocator (42.09M ops/s, -127 lines code)
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