Mercurial > hg
view hgext/bookflow.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 | 9f70512ae2cf |
children | 6000f5b25c9b |
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"""implements bookmark-based branching (EXPERIMENTAL) - Disables creation of new branches (config: enable_branches=False). - Requires an active bookmark on commit (config: require_bookmark=True). - Doesn't move the active bookmark on update, only on commit. - Requires '--rev' for moving an existing bookmark. - Protects special bookmarks (config: protect=@). flow related commands :hg book NAME: create a new bookmark :hg book NAME -r REV: move bookmark to revision (fast-forward) :hg up|co NAME: switch to bookmark :hg push -B .: push active bookmark """ from __future__ import absolute_import from mercurial.i18n import _ from mercurial import ( bookmarks, commands, error, extensions, registrar, ) MY_NAME = b'bookflow' configtable = {} configitem = registrar.configitem(configtable) configitem(MY_NAME, b'protect', [b'@']) configitem(MY_NAME, b'require-bookmark', True) configitem(MY_NAME, b'enable-branches', False) cmdtable = {} command = registrar.command(cmdtable) def commit_hook(ui, repo, **kwargs): active = repo._bookmarks.active if active: if active in ui.configlist(MY_NAME, b'protect'): raise error.Abort( _(b'cannot commit, bookmark %s is protected') % active ) if not cwd_at_bookmark(repo, active): raise error.Abort( _( b'cannot commit, working directory out of sync with active bookmark' ), hint=_(b"run 'hg up %s'") % active, ) elif ui.configbool(MY_NAME, b'require-bookmark', True): raise error.Abort(_(b'cannot commit without an active bookmark')) return 0 def bookmarks_update(orig, repo, parents, node): if len(parents) == 2: # called during commit return orig(repo, parents, node) else: # called during update return False def bookmarks_addbookmarks( orig, repo, tr, names, rev=None, force=False, inactive=False ): if not rev: marks = repo._bookmarks for name in names: if name in marks: raise error.Abort( _( b"bookmark %s already exists, to move use the --rev option" ) % name ) return orig(repo, tr, names, rev, force, inactive) def commands_commit(orig, ui, repo, *args, **opts): commit_hook(ui, repo) return orig(ui, repo, *args, **opts) def commands_pull(orig, ui, repo, *args, **opts): rc = orig(ui, repo, *args, **opts) active = repo._bookmarks.active if active and not cwd_at_bookmark(repo, active): ui.warn( _( b"working directory out of sync with active bookmark, run " b"'hg up %s'" ) % active ) return rc def commands_branch(orig, ui, repo, label=None, **opts): if label and not opts.get('clean') and not opts.get('rev'): raise error.Abort( _( b"creating named branches is disabled and you should use bookmarks" ), hint=b"see 'hg help bookflow'", ) return orig(ui, repo, label, **opts) def cwd_at_bookmark(repo, mark): mark_id = repo._bookmarks[mark] cur_id = repo.lookup(b'.') return cur_id == mark_id def uisetup(ui): extensions.wrapfunction(bookmarks, b'update', bookmarks_update) extensions.wrapfunction(bookmarks, b'addbookmarks', bookmarks_addbookmarks) extensions.wrapcommand(commands.table, b'commit', commands_commit) extensions.wrapcommand(commands.table, b'pull', commands_pull) if not ui.configbool(MY_NAME, b'enable-branches'): extensions.wrapcommand(commands.table, b'branch', commands_branch)