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Lecture 13 — Module 11: Performance, caching, and CI

Course: Yocto guide | Phase 2 — Embedded Linux, Yocto

Previous: Lecture 12 | Next: Lecture 14 — Capstone

1. Shared state (sstate) in one sentence

sstate caches task outputs so clean builds skip work that has not changed, when configured correctly.

2. CI design goals

Use deterministic branches for release streams, not moving-main surprises. Separate download and sstate directories on shared storage with locking discipline. Pin layers with SRCREV or manifest tools appropriate to your process.

3. Lab 11 — Measure a rebuild

Time a no-op rebuild with warm cache vs after wiping tmp but keeping downloads. Record the delta.

Done when: you can explain what you would never delete in CI vs what is safe to scrub.

Previous: Lecture 12 | Next: Lecture 14 — Capstone