Mercurial > hg
view hgext/automv.py @ 31397:8f5ed8fa39f8
perf: perform a garbage collection before each iteration
Currently, no explicit garbage collection is performed when running
the microbenchmarks in `hg perf`. I think this is wrong because
garbage collection can have a significant impact on execution times.
And, if gc is triggered via the default heuristics, it will
fire effectively randomly during subsequent benchmark iterations
due to variable amount of garbage left over from previous runs.
Running a gc before invoking the measured function will help ensure
state is more consistent across all iterations.
author | Gregory Szorc <gregory.szorc@gmail.com> |
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date | Mon, 13 Mar 2017 18:16:42 -0700 |
parents | a0939666b836 |
children | e4aefdb58ebe |
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# automv.py # # Copyright 2013-2016 Facebook, Inc. # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. """Check for unrecorded moves at commit time (EXPERIMENTAL) This extension checks at commit/amend time if any of the committed files comes from an unrecorded mv. The threshold at which a file is considered a move can be set with the ``automv.similarity`` config option. This option takes a percentage between 0 (disabled) and 100 (files must be identical), the default is 95. """ # Using 95 as a default similarity is based on an analysis of the mercurial # repositories of the cpython, mozilla-central & mercurial repositories, as # well as 2 very large facebook repositories. At 95 50% of all potential # missed moves would be caught, as well as correspond with 87% of all # explicitly marked moves. Together, 80% of moved files are 95% similar or # more. # # See http://markmail.org/thread/5pxnljesvufvom57 for context. from __future__ import absolute_import from mercurial.i18n import _ from mercurial import ( commands, copies, error, extensions, scmutil, similar ) def extsetup(ui): entry = extensions.wrapcommand( commands.table, 'commit', mvcheck) entry[1].append( ('', 'no-automv', None, _('disable automatic file move detection'))) def mvcheck(orig, ui, repo, *pats, **opts): """Hook to check for moves at commit time""" renames = None disabled = opts.pop('no_automv', False) if not disabled: threshold = ui.configint('automv', 'similarity', 95) if not 0 <= threshold <= 100: raise error.Abort(_('automv.similarity must be between 0 and 100')) if threshold > 0: match = scmutil.match(repo[None], pats, opts) added, removed = _interestingfiles(repo, match) renames = _findrenames(repo, match, added, removed, threshold / 100.0) with repo.wlock(): if renames is not None: scmutil._markchanges(repo, (), (), renames) return orig(ui, repo, *pats, **opts) def _interestingfiles(repo, matcher): """Find what files were added or removed in this commit. Returns a tuple of two lists: (added, removed). Only files not *already* marked as moved are included in the added list. """ stat = repo.status(match=matcher) added = stat[1] removed = stat[2] copy = copies._forwardcopies(repo['.'], repo[None], matcher) # remove the copy files for which we already have copy info added = [f for f in added if f not in copy] return added, removed def _findrenames(repo, matcher, added, removed, similarity): """Find what files in added are really moved files. Any file named in removed that is at least similarity% similar to a file in added is seen as a rename. """ renames = {} if similarity > 0: for src, dst, score in similar.findrenames( repo, added, removed, similarity): if repo.ui.verbose: repo.ui.status( _('detected move of %s as %s (%d%% similar)\n') % ( matcher.rel(src), matcher.rel(dst), score * 100)) renames[dst] = src if renames: repo.ui.status(_('detected move of %d files\n') % len(renames)) return renames