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view hgext/graphlog.py @ 42743:8c9a6adec67a
rust-discovery: using the children cache in add_missing
The DAG range computation often needs to get back to very old
revisions, and turns out to be disproportionately long, given
that the end goal is to remove the descendents of the given
missing revisons from the undecided set.
The fast iteration capabilities available in the Rust case make
it possible to avoid the DAG range entirely, at the cost of
precomputing the children cache, and to simply iterate on
children of the given missing revisions.
This is a case where staying on the same side of the interface
between the two languages has clear benefits.
On discoveries with initial undecided sets
small enough to bypass sampling entirely, the total cost of
computing the children cache and the subsequent iteration
becomes better than the Python + C counterpart, which relies on
reachableroots2.
For example, on a repo with more than one million revisions with
an initial undecided set of 11 elements, we get these figures:
Rust version with simple iteration
addcommons: 57.287us
first undecided computation: 184.278334ms
first children cache computation: 131.056us
addmissings iteration: 42.766us
first addinfo total: 185.24 ms
Python + C version
first addcommons: 0.29 ms
addcommons 0.21 ms
first undecided computation 191.35 ms
addmissings 45.75 ms
first addinfo total: 237.77 ms
On discoveries with large undecided sets, the initial price paid
makes the first addinfo slower than the Python + C version,
but that's more than compensated by the gain in sampling and
subsequent iterations.
Here's an extreme example with an undecided set of a million revisions:
Rust version:
first undecided computation: 293.842629ms
first children cache computation: 407.911297ms
addmissings iteration: 34.312869ms
first addinfo total: 776.02 ms
taking initial sample
query 2: sampling time: 1318.38 ms
query 2; still undecided: 1005013, sample size is: 200
addmissings: 143.062us
Python + C version:
first undecided computation 298.13 ms
addmissings 80.13 ms
first addinfo total: 399.62 ms
taking initial sample
query 2: sampling time: 3957.23 ms
query 2; still undecided: 1005013, sample size is: 200
addmissings 52.88 ms
Differential Revision: https://phab.mercurial-scm.org/D6428
author | Georges Racinet <georges.racinet@octobus.net> |
---|---|
date | Tue, 16 Apr 2019 01:16:39 +0200 |
parents | c303d65d2e34 |
children | 2372284d9457 |
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# ASCII graph log extension for Mercurial # # Copyright 2007 Joel Rosdahl <joel@rosdahl.net> # # This software may be used and distributed according to the terms of the # GNU General Public License version 2 or any later version. '''command to view revision graphs from a shell (DEPRECATED) The functionality of this extension has been include in core Mercurial since version 2.3. Please use :hg:`log -G ...` instead. This extension adds a --graph option to the incoming, outgoing and log commands. When this options is given, an ASCII representation of the revision graph is also shown. ''' from __future__ import absolute_import from mercurial.i18n import _ from mercurial import ( cmdutil, commands, registrar, ) 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 = 'ships-with-hg-core' @command('glog', [('f', 'follow', None, _('follow changeset history, or file history across copies and renames')), ('', 'follow-first', None, _('only follow the first parent of merge changesets (DEPRECATED)')), ('d', 'date', '', _('show revisions matching date spec'), _('DATE')), ('C', 'copies', None, _('show copied files')), ('k', 'keyword', [], _('do case-insensitive search for a given text'), _('TEXT')), ('r', 'rev', [], _('show the specified revision or revset'), _('REV')), ('', 'removed', None, _('include revisions where files were removed')), ('m', 'only-merges', None, _('show only merges (DEPRECATED)')), ('u', 'user', [], _('revisions committed by user'), _('USER')), ('', 'only-branch', [], _('show only changesets within the given named branch (DEPRECATED)'), _('BRANCH')), ('b', 'branch', [], _('show changesets within the given named branch'), _('BRANCH')), ('P', 'prune', [], _('do not display revision or any of its ancestors'), _('REV')), ] + cmdutil.logopts + cmdutil.walkopts, _('[OPTION]... [FILE]'), helpcategory=command.CATEGORY_CHANGE_NAVIGATION, inferrepo=True) def glog(ui, repo, *pats, **opts): """show revision history alongside an ASCII revision graph Print a revision history alongside a revision graph drawn with ASCII characters. Nodes printed as an @ character are parents of the working directory. This is an alias to :hg:`log -G`. """ opts[r'graph'] = True return commands.log(ui, repo, *pats, **opts)