Mercurial > hg
view hgext/purge.py @ 44363:f7459da77f23
nodemap: introduce an option to use mmap to read the nodemap mapping
The performance and memory benefit is much greater if we don't have to copy all
the data in memory for each information. So we introduce an option (on by
default) to read the data using mmap.
This changeset is the last one definition the API for index support nodemap
data. (they have to be able to use the mmaping).
Below are some benchmark comparing the best we currently have in 5.3 with the
final step of this series (using the persistent nodemap implementation in
Rust). The benchmark run `hg perfindex` with various revset and the following
variants:
Before:
* do not use the persistent nodemap
* use the CPython implementation of the index for nodemap
* use mmapping of the changelog index
After:
* use the MixedIndex Rust code, with the NodeTree object for nodemap access
(still in review)
* use the persistent nodemap data from disk
* access the persistent nodemap data through mmap
* use mmapping of the changelog index
The persistent nodemap greatly speed up most operation on very large
repositories. Some of the previously very fast lookup end up a bit slower because
the persistent nodemap has to be setup. However the absolute slowdown is very
small and won't matters in the big picture.
Here are some numbers (in seconds) for the reference copy of mozilla-try:
Revset Before After abs-change speedup
-10000: 0.004622 0.005532 0.000910 × 0.83
-10: 0.000050 0.000132 0.000082 × 0.37
tip 0.000052 0.000085 0.000033 × 0.61
0 + (-10000:) 0.028222 0.005337 -0.022885 × 5.29
0 0.023521 0.000084 -0.023437 × 280.01
(-10000:) + 0 0.235539 0.005308 -0.230231 × 44.37
(-10:) + :9 0.232883 0.000180 -0.232703 ×1293.79
(-10000:) + (:99) 0.238735 0.005358 -0.233377 × 44.55
:99 + (-10000:) 0.317942 0.005593 -0.312349 × 56.84
:9 + (-10:) 0.313372 0.000179 -0.313193 ×1750.68
:9 0.316450 0.000143 -0.316307 ×2212.93
On smaller repositories, the cost of nodemap related operation is not as big, so
the win is much more modest. Yet it helps shaving a handful of millisecond here
and there.
Here are some numbers (in seconds) for the reference copy of mercurial:
Revset Before After abs-change speedup
-10: 0.000065 0.000097 0.000032 × 0.67
tip 0.000063 0.000078 0.000015 × 0.80
0 0.000561 0.000079 -0.000482 × 7.10
-10000: 0.004609 0.003648 -0.000961 × 1.26
0 + (-10000:) 0.005023 0.003715 -0.001307 × 1.35
(-10:) + :9 0.002187 0.000108 -0.002079 ×20.25
(-10000:) + 0 0.006252 0.003716 -0.002536 × 1.68
(-10000:) + (:99) 0.006367 0.003707 -0.002660 × 1.71
:9 + (-10:) 0.003846 0.000110 -0.003736 ×34.96
:9 0.003854 0.000099 -0.003755 ×38.92
:99 + (-10000:) 0.007644 0.003778 -0.003866 × 2.02
Differential Revision: https://phab.mercurial-scm.org/D7894
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Tue, 11 Feb 2020 11:18:52 +0100 |
parents | 9f8eddd2723f |
children | 81859d38e009 |
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# Copyright (C) 2006 - Marco Barisione <marco@barisione.org> # # This is a small extension for Mercurial (https://mercurial-scm.org/) # that removes files not known to mercurial # # This program was inspired by the "cvspurge" script contained in CVS # utilities (http://www.red-bean.com/cvsutils/). # # For help on the usage of "hg purge" use: # hg help purge # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation; either version 2 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program; if not, see <http://www.gnu.org/licenses/>. '''command to delete untracked files from the working directory''' from __future__ import absolute_import from mercurial.i18n import _ from mercurial import ( cmdutil, merge as mergemod, pycompat, registrar, scmutil, ) cmdtable = {} command = registrar.command(cmdtable) # Note for extension authors: ONLY specify testedwith = 'ships-with-hg-core' for # extensions which SHIP WITH MERCURIAL. Non-mainline extensions should # be specifying the version(s) of Mercurial they are tested with, or # leave the attribute unspecified. testedwith = b'ships-with-hg-core' @command( b'purge|clean', [ (b'a', b'abort-on-err', None, _(b'abort if an error occurs')), (b'', b'all', None, _(b'purge ignored files too')), (b'i', b'ignored', None, _(b'purge only ignored files')), (b'', b'dirs', None, _(b'purge empty directories')), (b'', b'files', None, _(b'purge files')), (b'p', b'print', None, _(b'print filenames instead of deleting them')), ( b'0', b'print0', None, _( b'end filenames with NUL, for use with xargs' b' (implies -p/--print)' ), ), ] + cmdutil.walkopts, _(b'hg purge [OPTION]... [DIR]...'), helpcategory=command.CATEGORY_MAINTENANCE, ) def purge(ui, repo, *dirs, **opts): '''removes files not tracked by Mercurial Delete files not known to Mercurial. This is useful to test local and uncommitted changes in an otherwise-clean source tree. This means that purge will delete the following by default: - Unknown files: files marked with "?" by :hg:`status` - Empty directories: in fact Mercurial ignores directories unless they contain files under source control management But it will leave untouched: - Modified and unmodified tracked files - Ignored files (unless -i or --all is specified) - New files added to the repository (with :hg:`add`) The --files and --dirs options can be used to direct purge to delete only files, only directories, or both. If neither option is given, both will be deleted. If directories are given on the command line, only files in these directories are considered. Be careful with purge, as you could irreversibly delete some files you forgot to add to the repository. If you only want to print the list of files that this program would delete, use the --print option. ''' opts = pycompat.byteskwargs(opts) cmdutil.check_at_most_one_arg(opts, b'all', b'ignored') act = not opts.get(b'print') eol = b'\n' if opts.get(b'print0'): eol = b'\0' act = False # --print0 implies --print if opts.get(b'all', False): ignored = True unknown = True else: ignored = opts.get(b'ignored', False) unknown = not ignored removefiles = opts.get(b'files') removedirs = opts.get(b'dirs') if not removefiles and not removedirs: removefiles = True removedirs = True match = scmutil.match(repo[None], dirs, opts) paths = mergemod.purge( repo, match, unknown=unknown, ignored=ignored, removeemptydirs=removedirs, removefiles=removefiles, abortonerror=opts.get(b'abort_on_err'), noop=not act, ) for path in paths: if not act: ui.write(b'%s%s' % (path, eol))