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Improve performance of `arc branch` in Git with many branches

Authored by epriestley on Apr 16 2016, 4:43 PM.
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This is mostly just a personal quality-of-life fix. I run this command fairly often and having it return a little faster is nice.

This replaces a git show for each individual branch with a big git for-each-ref which we were already running anyway. This is quite a bit faster.

This command also occasionally hangs or segfaults for me while executing the huge pile of subprocesses. This is unreliable to reproduce, probably some bug in some PHP extension I have, and likely hard to narrow down, and this approach is better in every way anyway.

Test Plan
  • Ran arc branch in Git, observed faster output (in my phabricator/, about 2000ms -> 1200ms).
  • Ran arc feature in Mercurial.

Diff Detail

rARC Arcanist
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Tests Not Applicable

Event Timeline

epriestley retitled this revision from to Improve performance of `arc branch` in Git with many branches.
epriestley updated this object.
epriestley edited the test plan for this revision. (Show Details)
epriestley added a reviewer: chad.
chad edited edge metadata.
This revision is now accepted and ready to land.Apr 16 2016, 5:01 PM
This revision was automatically updated to reflect the committed changes.