Mercurial > hg
view tests/test-execute-bit.t @ 35599:af25237be091
perf: add threading capability to perfbdiff
Since we are releasing the GIL during diffing, it is interesting to see how a
thread pool would perform on diffing. We add a new `--threads` argument to
commands. Synchronizing the thread pool is a bit complex because we want to be
able to reuse it from one run to another.
On my computer (i7 with 4 cores + hyperthreading), I get the following data for
about 12000 revisions:
threads wall comb wall gain comb overhead
none 31.596715 31.59 0.00% 0.00%
1 31.621228 31.62 -0.08% 0.09%
2 16.406202 32.8 48.08% 3.83%
3 11.598334 34.76 63.29% 10.03%
4 9.205421 36.77 70.87% 16.40%
5 8.517604 42.51 73.04% 34.57%
6 7.94645 47.58 74.85% 50.62%
7 7.434972 51.92 76.47% 64.36%
8 7.070638 55.34 77.62% 75.18%
Compared to the feature disabled (threads=0), the overhead is negligible with
the threading code (threads=1), and the gain is already 48% with two threads.
author | Boris Feld <boris.feld@octobus.net> |
---|---|
date | Sun, 17 Dec 2017 04:31:27 +0100 |
parents | 7a9cbb315d84 |
children | b7fde9237c92 |
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#require execbit $ hg init $ echo a > a $ hg ci -Am'not executable' adding a $ chmod +x a $ hg ci -m'executable' $ hg id 79abf14474dc tip Make sure we notice the change of mode if the cached size == -1: $ hg rm a $ hg revert -r 0 a $ hg debugstate n 0 -1 unset a $ hg status M a $ hg up 0 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ hg id d69afc33ff8a $ test -x a && echo executable -- bad || echo not executable -- good not executable -- good