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hz-simpleperf-debug

Profiles Meta VR and Horizon OS application CPU performance using simpleperf — workload classification, CPU hotspot recording, kernel overhead measurement. Use when diagnosing whether an app is CPU-bound, memory-bound, or I/O-bound on Meta VR devices. Build paths: all Meta VR app stacks; use hz-quest-verify-first if the build path is unclear.

skills/hz-simpleperf-debug/SKILL.md

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Sep 24, 2026
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Apache-2.0

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# Simpleperf Debug Skill

## When to Use

Use this skill when you need hardware-level CPU performance insights on Meta VR devices:

- Classifying whether an app is CPU-bound, memory-bound, or I/O-bound
- Finding CPU hotspot functions consuming the most cycles
- Measuring kernel vs userspace CPU overhead per thread
- Identifying cache-thrashing or branch-prediction issues
- Supplementing Perfetto trace analysis with hardware PMU counter data

This skill complements `hz-perfetto-debug`. Perfetto shows *what* your app is doing over time. Simpleperf shows *where* the CPU is spending hardware cycles — cache misses, branch mispredictions, and instruction throughput that Perfetto can't see.