view tests/test-debian-packages.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.

#require test-repo slow debhelper debdeps

  $ . "$TESTDIR/helpers-testrepo.sh"
  $ testrepohgenv

Ensure debuild doesn't run the testsuite, as that could get silly.
  $ DEB_BUILD_OPTIONS=nocheck
  $ export DEB_BUILD_OPTIONS
  $ OUTPUTDIR=`pwd`
  $ export OUTPUTDIR

  $ cd "$TESTDIR"/..
  $ make deb > $OUTPUTDIR/build.log 2>&1
  $ cd $OUTPUTDIR
  $ ls *.deb | grep -v 'dbg'
  mercurial-common_*.deb (glob)
  mercurial_*.deb (glob)
main deb should have .so but no .py
  $ dpkg --contents mercurial_*.deb | egrep '(localrepo|parsers)'
  * ./usr/lib/python2.7/dist-packages/mercurial/cext/parsers*.so (glob)
mercurial-common should have py but no .so or pyc
  $ dpkg --contents mercurial-common_*.deb | egrep '(localrepo|parsers.*so)'
  * ./usr/lib/python2.7/dist-packages/mercurial/localrepo.py (glob)
zsh completions should be in the common package
  $ dpkg --contents mercurial-common_*.deb | egrep 'zsh.*[^/]$'
  * ./usr/share/zsh/vendor-completions/_hg (glob)
chg should be installed alongside hg, in the 'mercurial' package
  $ dpkg --contents mercurial_*.deb | egrep 'chg$'
  * ./usr/bin/chg (glob)
chg should come with a man page
  $ dpkg --contents mercurial_*.deb | egrep 'man.*chg'
  * ./usr/share/man/man1/chg.1.gz (glob)