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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 a492610a2fc1
children
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a492610a2fc1 contributing: add new file with a pointer to the wiki
Augie Fackler <augie@google.com>
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1 Our full contribution guidelines are in our wiki, please see:
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Augie Fackler <augie@google.com>
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2
a492610a2fc1 contributing: add new file with a pointer to the wiki
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3 https://www.mercurial-scm.org/wiki/ContributingChanges
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4
a492610a2fc1 contributing: add new file with a pointer to the wiki
Augie Fackler <augie@google.com>
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5 If you just want a checklist to follow, you can go straight to
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6
a492610a2fc1 contributing: add new file with a pointer to the wiki
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7 https://www.mercurial-scm.org/wiki/ContributingChanges#Submission_checklist
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Augie Fackler <augie@google.com>
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8
a492610a2fc1 contributing: add new file with a pointer to the wiki
Augie Fackler <augie@google.com>
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9 If you can't run the entire testsuite for some reason (it can be
a492610a2fc1 contributing: add new file with a pointer to the wiki
Augie Fackler <augie@google.com>
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10 difficult on Windows), please at least run `contrib/check-code.py` on
a492610a2fc1 contributing: add new file with a pointer to the wiki
Augie Fackler <augie@google.com>
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11 any files you've modified and run `python contrib/check-commit` on any
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Augie Fackler <augie@google.com>
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12 commits you've made (for example, `python contrib/check-commit
a492610a2fc1 contributing: add new file with a pointer to the wiki
Augie Fackler <augie@google.com>
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13 273ce12ad8f1` will report some style violations on a very old commit).