From 1468efadd79692641b99a51dbb512e87759bf690 Mon Sep 17 00:00:00 2001 From: "Moe Charm (CI)" Date: Sat, 29 Nov 2025 15:53:05 +0900 Subject: [PATCH] Update CURRENT_TASK.md: Phase 6 complete, next phase selection --- CURRENT_TASK.md | 46 ++++++++++++++++++++++------------------------ 1 file changed, 22 insertions(+), 24 deletions(-) diff --git a/CURRENT_TASK.md b/CURRENT_TASK.md index 7f66fc62..182db521 100644 --- a/CURRENT_TASK.md +++ b/CURRENT_TASK.md @@ -1,25 +1,22 @@ # Current Task: Choose Next Phase **Date**: 2025-11-29 -**Status**: Phase 5 ✅ COMPLETE → Next phase selection -**Achievement**: +28.9x improvement for Mid MT allocations (1KB-8KB) +**Status**: Phase 6 ✅ COMPLETE → Next phase selection +**Achievement**: Lock-free Mid MT (+2.65% improvement, code quality++) --- -## Phase 5 Complete! ✅ +## Phase 6 Complete! ✅ -**Result**: Mid/Large Allocation Optimization **COMPLETE** -**Performance**: 1.49M → 41.0M ops/s (+28.9x for Mid MT, 1.53x faster than system malloc) -**Duration**: 1 day (focused execution) +**Result**: Lock-free Mid MT Allocator **COMPLETE** +**Performance**: 41.0M → 42.09M ops/s (+2.65% for Mid MT) +**Duration**: 1 day (quick improvement) **Completed Steps**: -- ✅ Step 1: Mid MT Verification (range bug identified) -- ✅ Step 2: Mid Free Route Box (+28.9x improvement) -- ✅ Step 3: Mid/Large Config Box (future workload infrastructure) -- ⏸️ Step 4: Mid Registry Pre-alloc (deferred, MT workload needed) -- ✅ Step 5: Documentation (PHASE5_COMPLETION_REPORT.md) +- ✅ Phase 6-A: Code readability (debug guard around SuperSlab lookup) +- ✅ Phase 6-B: Header-based Mid MT free (lock-free, -127 lines) -**See**: `PHASE5_COMPLETION_REPORT.md` for full details +**See**: `PHASE6A_DISCREPANCY_INVESTIGATION.md` and `PHASE6B_DISCREPANCY_INVESTIGATION.md` --- @@ -39,7 +36,7 @@ **Cons**: - May be system noise (not real regression) -- Workload is Tiny-only (unaffected by Phase 5 changes) +- Workload is Tiny-only (unaffected by Phase 5/6 changes) - Could be time spent on noise instead of real gains --- @@ -117,7 +114,7 @@ **Risk**: High (no MT benchmark exists yet) **Pros**: -- Unlock Phase 5-Step4 (Mid registry pre-allocation) +- Unlock Phase 5-Step4 (Mid registry pre-allocation, now obsolete with Phase 6-B) - Real-world workloads are often MT - Could show significant MT scalability gains @@ -129,7 +126,7 @@ **Required Work**: 1. Create MT benchmark (4+ threads, mixed sizes) 2. Profile MT contention points -3. Implement registry pre-allocation +3. Implement remote free (currently memory leak) 4. Add lock-free structures where needed 5. Validate MT correctness (TSAN, stress testing) @@ -196,21 +193,22 @@ Phase 4-Step3 (full): ~55-58 M ops/s (+5-8% expected) ``` Phase 3 (mincore removal): 56.8 M ops/s Phase 4 (Hot/Cold Box): 57.2 M ops/s (+0.7%) -Phase 5 (current): 52.3 M ops/s (-8.6% regression) +Phase 5/6 (current): 52.3 M ops/s (-8.6% regression) ``` -**Note**: Regression unrelated to Phase 5 (Tiny-only workload, doesn't touch Mid MT) +**Note**: Regression unrelated to Phase 5/6 (Tiny-only workload, doesn't touch Mid MT) ### bench_mid_mt_gap (1KB-8KB, Mid MT workload) ``` Before Phase 5 (broken): 1.49 M ops/s (mmap fallback) After Phase 5 (fixed): 41.0 M ops/s (+28.9x) -vs System malloc: 26.8 M ops/s (1.53x faster) +After Phase 6-B (lock-free): 42.09 M ops/s (+2.65%) +vs System malloc: 26.8 M ops/s (1.57x faster) ``` -**Achievement**: ✅ Major success! +**Achievement**: ✅ Major success! Lock-free, simpler code ### Overall Status - ✅ **Tiny allocations** (16B-1KB): 52-57 M ops/s (good, some regression) -- ✅ **Mid MT allocations** (1KB-8KB): 41 M ops/s (excellent, 1.53x vs system) +- ✅ **Mid MT allocations** (1KB-8KB): 42 M ops/s (excellent, 1.57x vs system, lock-free) - ⏸️ **Large allocations** (32KB-2MB): Not benchmarked yet - ⏸️ **MT workloads**: No MT benchmarks yet @@ -225,11 +223,11 @@ vs System malloc: 26.8 M ops/s (1.53x faster) - **Option D**: Production readiness & benchmarking - **Option E**: Multi-threaded optimization -**Or**: Take a break, Phase 5 is a big win! 🎉 +**Or**: Take a break, Phase 5+6 are big wins! 🎉 --- Updated: 2025-11-29 -Phase: 5 COMPLETE → 6 PENDING -Previous: Phase 4 (Tiny Front Optimization, +7.3%) -Achievement: +28.9x Mid MT improvement (1.49M → 41.0M ops/s) +Phase: 6 COMPLETE → 7 PENDING +Previous: Phase 5 (Mid/Large Optimization, +28.9x), Phase 6 (Lock-free Mid MT, +2.65%) +Achievement: Lock-free Mid MT allocator (42.09M ops/s, -127 lines code)