https://bz.mercurial-scm.org/show_bug.cgi?id=5947
Bug ID: 5947
Summary: ui.tweakdefaults undermines fsmonitor via
command.status.terse=u
Product: Mercurial
Version: default branch
Hardware: All
OS: All
Status: UNCONFIRMED
Keywords: perfregression
Severity: bug
Priority: urgent
Component: Mercurial
Assignee: bugzi...@mercurial-scm.org
Reporter: gregory.sz...@gmail.com
CC: mercurial-devel@mercurial-scm.org
https://www.mercurial-scm.org/repo/hg/rev/6acf41bb8d40 added
commands.status.terse=u to tweakdefaults.
On large repositories (like Firefox), this has significant performance
implications and completely negates any speedups from fsmonitor:
HGRCPATH= hg --time status
time: real 1.340 secs (user 0.960+0.000 sys 0.380+0.000)
HGRCPATH= hg --time --config commands.status.terse=u status
time: real 2.420 secs (user 2.070+0.000 sys 0.360+0.000)
HGRCPATH= hg --time --config extensions.fsmonitor= status
time: real 0.080 secs (user 0.050+0.010 sys 0.040+0.000)
HGRCPATH= ~/src/hg/hg --time --config extensions.fsmonitor= --config
commands.status.terse=u status
time: real 2.470 secs (user 2.080+0.000 sys 0.390+0.000)
(This is on Linux on my i7-6700K with current @.)
I'm marking this as a perf regression because ui.tweakdefaults behaved
reasonably in 3.6. While I really like the terse status feature, we've been
steering people towards ui.tweakdefaults=true at Mozilla and the loss of
fsmonitor will definitely be felt. I'd strongly prefer we fix the performance
regression or not enable commands.status.terse=u before we ship 3.7.
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