66 lines
2.4 KiB
C
66 lines
2.4 KiB
C
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// hakmem_elo.h - ELO Rating Strategy Selection (Box Theory)
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//
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// Priority 1 optimization from ChatGPT Pro feedback:
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// ELO-based strategy selection for multi-objective optimization
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//
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// Why ELO beats UCB1:
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// - UCB1 assumes independent arms
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// - ELO handles transitivity (if A>B and B>C, then A>C)
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// - Better for multi-objective scoring (CPU + memory + page faults)
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//
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// Expected Gain: +10-20% on VM scenario (close gap with mimalloc)
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#pragma once
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#include <stddef.h>
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#include <stdint.h>
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// Configuration
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#define ELO_K_FACTOR 32.0 // ELO K-factor (higher = faster learning)
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#define ELO_INITIAL_RATING 1500.0 // Starting ELO rating
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#define ELO_MAX_STRATEGIES 12 // Max candidate strategies
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#define ELO_EPSILON 0.1 // Epsilon-greedy exploration (10%)
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#define ELO_MIN_SAMPLES 50 // Min samples before ELO update
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#define ELO_SURVIVAL_COUNT 6 // Top-M strategies survive
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// Strategy Candidate
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typedef struct {
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int strategy_id; // Unique strategy ID
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double elo_rating; // Current ELO rating (starts at 1500)
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uint64_t wins; // Number of wins
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uint64_t losses; // Number of losses
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uint64_t draws; // Number of draws
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uint64_t samples; // Total samples collected
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size_t threshold_bytes; // mmap threshold for this strategy
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int active; // 1 if strategy is active
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} EloStrategyCandidate;
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// Allocation Statistics (for comparison)
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typedef struct {
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uint64_t cpu_ns; // CPU time (nanoseconds)
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uint64_t page_faults; // Number of page faults
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uint64_t bytes_live; // Live memory bytes
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uint64_t alloc_count; // Number of allocations
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} EloAllocStats;
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// ELO System API (Box Interface)
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void hak_elo_init(void);
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void hak_elo_shutdown(void);
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// Strategy selection (epsilon-greedy)
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int hak_elo_select_strategy(void);
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size_t hak_elo_get_threshold(int strategy_id);
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// Record allocation result
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void hak_elo_record_alloc(int strategy_id, size_t size, uint64_t duration_ns);
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// Trigger ELO evolution (pairwise comparison)
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void hak_elo_trigger_evolution(void);
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// Statistics
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void hak_elo_print_stats(void);
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void hak_elo_print_leaderboard(void);
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// Internal helpers (exposed for testing)
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double hak_elo_compute_score(const EloAllocStats* stats);
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void hak_elo_update_ratings(EloStrategyCandidate* a, EloStrategyCandidate* b, double score_diff);
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