Bisection: It's Not Just for Git
summary
Team runs 8–12 hour QEMU builds and performs weekly checks, so a regression finder must minimize runs. The project builds a lightweight bisection tool that applies multi-axis bisection across package, kernel and test-suite axes, integrates with Jenkins, and reports a single first-bad combination. It uses probabilistic comparison (divperf), two-out-of-three sampling to reduce flakiness, stores a bisect lock for reproducibility, and ships as bisecter (github.com/ldoktor/bisecter); it works in CI but is early beta.
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chapters (6)
- 0:00Introduction to bisection and Git bisect
- 7:24Performance testing case
- 15:55Git bisect limitations
- 18:47Multi-axis bisection
- 27:43Key takeaways
- 28:48Q&A
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