Module entropy_cache_global 

Global entropy cache for multi-symbol processors

Issue #145: Multi-Symbol Entropy Cache Sharing Provides a thread-safe, shared entropy cache across all processors.

Architecture

Instead of each processor maintaining its own 128-entry cache:

• Before: 20 separate caches (5 symbols × 4 thresholds × 128 entries each)
• After: 1 global cache (512-1024 entries) shared across all processors

Benefits

• Memory reduction: 20 × 128 → 1 × 1024 = 20-30% savings on multi-symbol workloads
• Hit ratio improvement: 34.5% → 50%+ (larger cache size + price-based key is symbol-independent)
• Thread-safe: Arc<RwLock<>> for safe concurrent access
• Backward compatible: Local cache still available as default

Usage

use rangebar_core::entropy_cache_global::{get_global_entropy_cache, EntropyCache};

// Option 1: Use global cache (recommended for multi-symbol)
let cache = get_global_entropy_cache();
let mut cache_guard = cache.write();
compute_entropy_adaptive_cached(prices, &mut cache_guard);

// Option 2: Use local cache (default, backward compatible)
let cache = Arc::new(RwLock::new(EntropyCache::new()));

Constants

GLOBAL_ENTROPY_CACHE_CAPACITY

Maximum capacity for the global entropy cache (tunable via this constant)

Statics

GLOBAL_ENTROPY_CACHE

Global entropy cache shared across all processors

Functions

create_local_entropy_cache

Create a local entropy cache (backward compatibility)

get_global_entropy_cache

Get a reference to the global entropy cache

warm_up_entropy_cache

Warm up the global entropy cache with deterministic price patterns