tree 6f39123b56d9d19f0c5c0882f9a32852563aac5d
parent 7e15eb551c79528302680296ec1cd13261d9c7a9
author Kevin Lubick <kjlubick@google.com> 1628003863 -0400
committer Kevin Lubick <kjlubick@google.com> 1628004091 +0000

[gold] Add high contention mode for calculating diffs

I don't know if we only want one of these two modes, so
I'm making it opt-in for now. The chrome instance needs it
but all other instances were doing fine with the other way.

The chrome instance has a lot of CLs, and thus a lot of
rows in the SecondaryBranchDiffCalculationWork table, which
caused finding new work to take 10+ seconds, mostly because
there were a lot of retries as that table was being modified
from periodictasks, as well as other diffcalculators.

Bug: skia:12221
Change-Id: I6d15c1c1b4206accd7fe0f7d9af7698ffcc83d7b
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/436007
Reviewed-by: Kevin Lubick <kjlubick@google.com>