bryancall opened a new pull request, #474:
URL: https://github.com/apache/trafficserver-ci/pull/474
Branch build children fetch every branch from the CI mirror
(`+refs/heads/*`) at depth 1000. Measured on the controller, one of those
fetches is a 165 MB pack and uses about 570 MB of git memory on the server. A
branch build starts about 30 children at once on an 8 GB controller, so it runs
out of memory. Jenkins was killed three times during one master branch build on
Oct 14.
This changes the branch pipelines to fetch only
`refs/heads/${GITHUB_BRANCH}`, with `honorRefspec: true` so the initial clone
uses the same refspec, the way the PR pipelines already do. For master that is
a 37 MB pack and about 306 MB on the server, and it serves in about 4 s instead
of 15 s. Children still check out the SHA that `branch_build` resolved, which
is on that branch within the existing depth of 1000. One trade-off: a manually
requested `SHA1` now has to be on the branch being built, where before a commit
from any branch worked.
Tested by running the same fetch Jenkins will run against the mirror
(`--depth=1000` with the master-only refspec): a 37 MB pack with only
`origin/master`, and the SHA from rat #1422 checked out cleanly. Not yet
exercised in a Jenkins run.
Part of
[apache/trafficserver#13839](https://github.com/apache/trafficserver/issues/13839).
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