k4bench.provenance

k4bench.provenance

Key4hep stack provenance — the upstream commit each package was built from.

A benchmark measures a stack, not just a detector: when a metric steps, the cause is almost always a commit that landed in one of the ~60 packages the nightly builds from git. Recording those commits at benchmark time is what later lets a regression be traced back to the pull requests that could have caused it.

Capture has to happen while the benchmark runs. LCG rotates its weekday views, so a stack that is not recorded when it ran is soon unrecoverable — this package is called from nightly_benchmark.sh rather than reconstructed after the fact.

• :mod:k4bench.provenance.stack — read an LCG view's manifest off CVMFS.