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cpu-cache-opt

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Use when diagnosing cache misses with perf, fixing false sharing, choosing AoS or SoA layout, or adding software prefetch. Not for cache theory: use memory-hierarchy-and-caches.

.devin/skills/cpu-cache-opt/SKILL.md

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# CPU cache optimization

Cache performance is a layout property before it is a code property. Measure with hardware counters, move the data so the working set fits, and re-measure. Every change must show up in the counters, or it reverts.

## Contract

| Field | Bound contract |
|---|---|
| Trigger | The task diagnoses cache misses, detects or fixes false sharing, restructures data layout, evaluates AoS versus SoA, or decides on software prefetch. |
| Authority | Read-only. The skill runs performance tools that read the program and prints guidance; source and build changes land through the normal coding path. No remote mutation. |
| Side effect | None beyond tool output files that the profiling tools write to their own scratch locations. |
| Done | A measured before and after for the proposed layout change exists, with the cache counters quoted, or the diagnosis names the miss class and the evidence for it. |

## Inputs