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Claude 09e1d89e8d Phase 6-4: Larson benchmark optimizations - LUT size-to-class 
Two optimizations to improve Larson benchmark performance:

1. **Option A: Fast Path Priority** (core/hakmem.c)
   - Move HAKMEM_TINY_FAST_PATH check before all guard checks
   - Reduce malloc() fast path from 8+ branches to 3 branches
   - Results: +42% ST, -20% MT (mixed results)

2. **LUT Optimization** (core/tiny_fastcache.h)
   - Replace 11-branch linear search with O(1) lookup table
   - Use size_to_class_lut[size >> 3] for fast mapping
   - Results: +24% MT, -24% ST (MT-optimized tradeoff)

Benchmark results (Larson 2s 8-128B 1024 chunks):
- Original:     ST 0.498M ops/s, MT 1.502M ops/s
- LUT version:  ST 0.377M ops/s, MT 1.856M ops/s

Analysis:
- ST regression: Branch predictor learns linear search pattern
- MT improvement: LUT avoids branch misprediction on context switch
- Recommendation: Keep LUT for multi-threaded workloads

Related: LARSON_PERFORMANCE_ANALYSIS_2025_11_05.md
2025-11-05 04:58:03 +00:00
..
hakmem_ace_controller.c
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hakmem_ace_controller.h
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hakmem_ace_metrics.c
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hakmem_ace_metrics.h
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hakmem_ace_stats.c
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hakmem_ace_stats.h
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hakmem_ace_ucb1.c
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hakmem_ace_ucb1.h
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hakmem_ace.c
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hakmem_ace.h
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hakmem_batch.c
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hakmem_batch.h
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hakmem_bigcache.c
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hakmem_bigcache.h
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hakmem_build_flags.h
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hakmem_config.c
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hakmem_config.h
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hakmem_debug.c
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hakmem_debug.h
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hakmem_elo.c
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hakmem_elo.h
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hakmem_evo.c
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hakmem_evo.h
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hakmem_features.h
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hakmem_internal.h
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hakmem_l25_pool.c
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hakmem_l25_pool.h
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hakmem_learn_log.c
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hakmem_learn_log.h
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hakmem_learner.c
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hakmem_learner.h
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hakmem_libc.c
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hakmem_mid_mt.c
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hakmem_mid_mt.h
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hakmem_p2.c
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hakmem_p2.h
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hakmem_policy.c
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hakmem_policy.h
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hakmem_pool.c
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hakmem_pool.h
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hakmem_prof.c
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hakmem_prof.h
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hakmem_site_rules.c
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hakmem_site_rules.h
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hakmem_size_hist.c
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hakmem_size_hist.h
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hakmem_sizeclass_dist.c
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hakmem_sizeclass_dist.h
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hakmem_super_registry.c
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hakmem_super_registry.h
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hakmem_sys.c
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hakmem_sys.h
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hakmem_syscall.c
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hakmem_syscall.h
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hakmem_tiny_alloc_new.inc
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hakmem_tiny_alloc_v3.inc
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hakmem_tiny_alloc.inc
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hakmem_tiny_assist.inc.h
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hakmem_tiny_background.inc
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hakmem_tiny_batch_refill.h
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hakmem_tiny_bg_bin.inc.h
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hakmem_tiny_bg_spill.c
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hakmem_tiny_bg_spill.h
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hakmem_tiny_bump.inc.h
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hakmem_tiny_config.c
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hakmem_tiny_config.h
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hakmem_tiny_drain_ema.inc.h
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hakmem_tiny_fastcache.inc.h
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hakmem_tiny_free.inc
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hakmem_tiny_hot_pop_v4.inc.h
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hakmem_tiny_hot_pop.inc.h
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hakmem_tiny_hotmag.inc.h
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hakmem_tiny_init.inc
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hakmem_tiny_intel.inc
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hakmem_tiny_lifecycle.inc
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hakmem_tiny_magazine.c
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hakmem_tiny_magazine.h
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hakmem_tiny_metadata.inc
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hakmem_tiny_mini_mag.h
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hakmem_tiny_query_api.h
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hakmem_tiny_query.c
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hakmem_tiny_refill_p0.inc.h
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hakmem_tiny_refill.inc.h
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hakmem_tiny_registry_api.h
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hakmem_tiny_registry.c
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hakmem_tiny_remote_target.c
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hakmem_tiny_remote_target.h
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hakmem_tiny_remote.inc
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hakmem_tiny_rss_api.h
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hakmem_tiny_rss.c
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hakmem_tiny_simple.c
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hakmem_tiny_simple.h
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hakmem_tiny_slab_mgmt.inc
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hakmem_tiny_slow.inc
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hakmem_tiny_smallmag.inc.h
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hakmem_tiny_ss_target.c
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hakmem_tiny_ss_target.h
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hakmem_tiny_stats_api.h
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hakmem_tiny_stats.c
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hakmem_tiny_stats.h
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hakmem_tiny_superslab.c
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hakmem_tiny_superslab.h
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hakmem_tiny_tls_list.h
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hakmem_tiny_tls_ops.h
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hakmem_tiny_ultra_front.inc.h
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hakmem_tiny_ultra_simple.inc
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hakmem_tiny.c
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hakmem_tiny.h
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hakmem_trace.h
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hakmem_ucb1.c
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hakmem_whale.c
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hakmem_whale.h
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hakmem.c
Phase 6-4: Larson benchmark optimizations - LUT size-to-class
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hakmem.h
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mid_tcache.h
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slab_handle.h
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tiny_alloc_fast.inc.h
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tiny_atomic.h
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tiny_debug_ring.c
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tiny_debug_ring.h
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tiny_debug.h
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tiny_fastcache.c
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tiny_fastcache.h
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tiny_free_fast.inc.h
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tiny_mailbox.c
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tiny_mailbox.h
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tiny_mmap_gate.h
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tiny_publish.c
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tiny_publish.h
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tiny_refill_opt.h
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tiny_refill.h
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tiny_remote.c
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tiny_remote.h
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tiny_sticky.c
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tiny_sticky.h
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tiny_tls_guard.h
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tiny_tls.h
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