CPU Cache Optimization

Purpose

Guide agents through cache-aware programming: diagnosing cache misses with perf, data layout transformations (AoS→SoA), false sharing detection and fixes, prefetching, and cache-friendly algorithm design.

Triggers

• "My program has high cache miss rates — how do I fix it?"
• "What is false sharing and how do I detect it?"
• "Should I use AoS or SoA data layout?"
• "How do I measure cache performance with perf?"
• "How do I use __builtin_prefetch?"
• "My multithreaded program is slower than single-threaded due to cache"

Workflow

1. Measure cache performance