The module build directories are rewritten every job on a machine that
is also the mac-local runner for both app repos, so indexing them lands
in the merge path for everything. `mds_stores` and `mdworker_shared` sit
at the top of CPU while no build process is near it, and the load
average goes into the hundreds.
Measured on the iPhone repo, same from-scratch build twice: it peaks at
load 12.5 with its output excluded and over a hundred without, and the
indexing work stops accumulating rather than trailing the build by
minutes.
The markers are written by the job rather than committed, because the
directories they belong in are created by the build and removed between
runs. The stable caches outside the repo were excluded on the host
itself: DerivedData, the Android SDK, the runner's builds directory and
the Gradle home, 11 GB between them.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
