Mercurial > hg
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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 | 18c6b271579b |
children | 4e4fae1dda5c |
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#!/usr/bin/env python # # runrst - register custom roles and run correct writer # # Copyright 2010 Matt Mackall <mpm@selenic.com> and others # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. """usage: %s WRITER args... where WRITER is the name of a Docutils writer such as 'html' or 'manpage' """ import sys try: from docutils.parsers.rst import roles from docutils.core import publish_cmdline from docutils import nodes, utils except ImportError: sys.stderr.write("abort: couldn't generate documentation: docutils " "module is missing\n") sys.stderr.write("please install python-docutils or see " "http://docutils.sourceforge.net/\n") sys.exit(-1) def role_hg(name, rawtext, text, lineno, inliner, options={}, content=[]): text = "hg " + utils.unescape(text) linktext = nodes.literal(rawtext, text) parts = text.split() cmd, args = parts[1], parts[2:] refuri = "hg.1.html#%s" % cmd if cmd == 'help' and args: if args[0] == 'config': # :hg:`help config` refuri = "hgrc.5.html" elif args[0].startswith('config.'): # :hg:`help config.SECTION...` refuri = "hgrc.5.html#%s" % args[0].split('.', 2)[1] elif len(args) >= 2 and args[0] == '-c': # :hg:`help -c COMMAND ...` is equivalent to :hg:`COMMAND` # (mainly for :hg:`help -c config`) refuri = "hg.1.html#%s" % args[1] else: refuri = "hg.1.html#%s" % args[0] node = nodes.reference(rawtext, '', linktext, refuri=refuri) return [node], [] roles.register_local_role("hg", role_hg) if __name__ == "__main__": if len(sys.argv) < 2: sys.stderr.write(__doc__ % sys.argv[0]) sys.exit(1) writer = sys.argv[1] del sys.argv[1] publish_cmdline(writer_name=writer)