Mercurial > hg
view hgext/split.py @ 43252:32187ae9eeb3
copies: simplify the handling of merges
Instead of stacking copies for both parent on the head, we move copies outside
of the heap into a dedicated dictionary. The two side of merge can we merged
sooner, making the algorithm simpler.
This simplicity reflect in the heap structure and speed up the execution for
copies involving a large amount of merges.
Here are timing for perfpathcopies of multiple revision pairs.
- filelog: timing using filelog (with the introrev condition dropped)
- base: this series base
- before: the parent of this changeset
- after: this changeset
revision: large amount; added files: large amount; rename small amount; c3b14617fbd7 9ba6ab77fd29
filelog: ! wall 3.679613 comb 3.680000 user 3.580000 sys 0.100000 (median of 3)
base: ! wall 8.884369 comb 8.880000 user 8.850000 sys 0.030000 (median of 3)
before: ! wall 8.443747 comb 8.420000 user 8.410000 sys 0.010000 (median of 3)
after: ! wall 4.697917 comb 4.690000 user 4.660000 sys 0.030000 (median of 3)
revision: large amount; added files: small amount; rename small amount; c3b14617fbd7 f650a9b140d2
filelog: ! wall 0.003357 comb 0.010000 user 0.010000 sys 0.000000 (median of 781)
base: ! wall 12.398524 comb 12.400000 user 12.330000 sys 0.070000 (median of 3)
before: ! wall 10.852593 comb 10.850000 user 10.800000 sys 0.050000 (median of 3)
after: ! wall 6.750832 comb 6.750000 user 6.640000 sys 0.110000 (median of 3)
revision: large amount; added files: large amount; rename large amount; 08ea3258278e d9fa043f30c0
filelog: ! wall 2.754687 comb 2.760000 user 2.650000 sys 0.110000 (median of 4)
base: ! wall 1.423166 comb 1.420000 user 1.400000 sys 0.020000 (median of 8)
before: ! wall 1.068041 comb 1.060000 user 1.050000 sys 0.010000 (median of 10)
after: ! wall 1.045916 comb 1.050000 user 1.040000 sys 0.010000 (median of 10)
revision: small amount; added files: large amount; rename large amount; df6f7a526b60 a83dc6a2d56f
filelog: ! wall 1.552293 comb 1.550000 user 1.510000 sys 0.040000 (median of 6
base: ! wall 0.022662 comb 0.020000 user 0.020000 sys 0.000000 (median of 128)
before: ! wall 0.021111 comb 0.020000 user 0.020000 sys 0.000000 (median of 139)
after: ! wall 0.021577 comb 0.020000 user 0.020000 sys 0.000000 (median of 138)
revision: small amount; added files: large amount; rename small amount; 4aa4e1f8e19a 169138063d63
filelog: ! wall 1.500983 comb 1.500000 user 1.420000 sys 0.080000 (median of 7)
base: ! wall 0.006956 comb 0.010000 user 0.010000 sys 0.000000 (median of 392)
before: ! wall 0.004356 comb 0.010000 user 0.010000 sys 0.000000 (median of 675)
after: ! wall 0.004329 comb 0.000000 user 0.000000 sys 0.000000 (median of 682)
revision: small amount; added files: small amount; rename small amount; 4bc173b045a6 964879152e2e
filelog: ! wall 0.011745 comb 0.020000 user 0.020000 sys 0.000000 (median of 250)
base: ! wall 0.000156 comb 0.000000 user 0.000000 sys 0.000000 (median of 17180)
before: ! wall 0.000100 comb 0.000000 user 0.000000 sys 0.000000 (median of 26912)
after: ! wall 0.000105 comb 0.000000 user 0.000000 sys 0.000000 (median of 25689)
revision: medium amount; added files: large amount; rename medium amount; c95f1ced15f2 2c68e87c3efe
filelog: ! wall 3.228230 comb 3.230000 user 3.110000 sys 0.120000 (median of 4)
base: ! wall 0.997640 comb 1.000000 user 0.980000 sys 0.020000 (median of 10)
before: ! wall 0.778291 comb 0.780000 user 0.780000 sys 0.000000 (median of 13)
after: ! wall 0.706594 comb 0.710000 user 0.710000 sys 0.000000 (median of 15)
revision: medium amount; added files: medium amount; rename small amount; d343da0c55a8 d7746d32bf9d
filelog: ! wall 1.052501 comb 1.060000 user 1.040000 sys 0.020000 (median of 10
base: ! wall 0.214519 comb 0.220000 user 0.220000 sys 0.000000 (median of 45)
before: ! wall 0.160804 comb 0.160000 user 0.160000 sys 0.000000 (median of 62)
after: ! wall 0.163736 comb 0.160000 user 0.160000 sys 0.000000 (median of 60)
Differential Revision: https://phab.mercurial-scm.org/D7069
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
---|---|
date | Wed, 02 Oct 2019 13:43:27 -0400 |
parents | 8ff1ecfadcd1 |
children | 705738def50c |
line wrap: on
line source
# split.py - split a changeset into smaller ones # # Copyright 2015 Laurent Charignon <lcharignon@fb.com> # Copyright 2017 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. """command to split a changeset into smaller ones (EXPERIMENTAL)""" from __future__ import absolute_import from mercurial.i18n import _ from mercurial.node import ( nullid, short, ) from mercurial import ( bookmarks, cmdutil, commands, error, hg, obsolete, phases, pycompat, registrar, revsetlang, scmutil, ) # allow people to use split without explicitly enabling rebase extension from . import rebase 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'split', [ (b'r', b'rev', b'', _(b"revision to split"), _(b'REV')), (b'', b'rebase', True, _(b'rebase descendants after split')), ] + cmdutil.commitopts2, _(b'hg split [--no-rebase] [[-r] REV]'), helpcategory=command.CATEGORY_CHANGE_MANAGEMENT, helpbasic=True, ) def split(ui, repo, *revs, **opts): """split a changeset into smaller ones Repeatedly prompt changes and commit message for new changesets until there is nothing left in the original changeset. If --rev was not given, split the working directory parent. By default, rebase connected non-obsoleted descendants onto the new changeset. Use --no-rebase to avoid the rebase. """ opts = pycompat.byteskwargs(opts) revlist = [] if opts.get(b'rev'): revlist.append(opts.get(b'rev')) revlist.extend(revs) with repo.wlock(), repo.lock(), repo.transaction(b'split') as tr: revs = scmutil.revrange(repo, revlist or [b'.']) if len(revs) > 1: raise error.Abort(_(b'cannot split multiple revisions')) rev = revs.first() ctx = repo[rev] if rev is None or ctx.node() == nullid: ui.status(_(b'nothing to split\n')) return 1 if ctx.node() is None: raise error.Abort(_(b'cannot split working directory')) # rewriteutil.precheck is not very useful here because: # 1. null check is done above and it's more friendly to return 1 # instead of abort # 2. mergestate check is done below by cmdutil.bailifchanged # 3. unstable check is more complex here because of --rebase # # So only "public" check is useful and it's checked directly here. if ctx.phase() == phases.public: raise error.Abort( _(b'cannot split public changeset'), hint=_(b"see 'hg help phases' for details"), ) descendants = list(repo.revs(b'(%d::) - (%d)', rev, rev)) alloworphaned = obsolete.isenabled(repo, obsolete.allowunstableopt) if opts.get(b'rebase'): # Skip obsoleted descendants and their descendants so the rebase # won't cause conflicts for sure. torebase = list( repo.revs( b'%ld - (%ld & obsolete())::', descendants, descendants ) ) if not alloworphaned and len(torebase) != len(descendants): raise error.Abort( _(b'split would leave orphaned changesets behind') ) else: if not alloworphaned and descendants: raise error.Abort( _(b'cannot split changeset with children without rebase') ) torebase = () if len(ctx.parents()) > 1: raise error.Abort(_(b'cannot split a merge changeset')) cmdutil.bailifchanged(repo) # Deactivate bookmark temporarily so it won't get moved unintentionally bname = repo._activebookmark if bname and repo._bookmarks[bname] != ctx.node(): bookmarks.deactivate(repo) wnode = repo[b'.'].node() top = None try: top = dosplit(ui, repo, tr, ctx, opts) finally: # top is None: split failed, need update --clean recovery. # wnode == ctx.node(): wnode split, no need to update. if top is None or wnode != ctx.node(): hg.clean(repo, wnode, show_stats=False) if bname: bookmarks.activate(repo, bname) if torebase and top: dorebase(ui, repo, torebase, top) def dosplit(ui, repo, tr, ctx, opts): committed = [] # [ctx] # Set working parent to ctx.p1(), and keep working copy as ctx's content if ctx.node() != repo.dirstate.p1(): hg.clean(repo, ctx.node(), show_stats=False) with repo.dirstate.parentchange(): scmutil.movedirstate(repo, ctx.p1()) # Any modified, added, removed, deleted result means split is incomplete incomplete = lambda repo: any(repo.status()[:4]) # Main split loop while incomplete(repo): if committed: header = _( b'HG: Splitting %s. So far it has been split into:\n' ) % short(ctx.node()) for c in committed: firstline = c.description().split(b'\n', 1)[0] header += _(b'HG: - %s: %s\n') % (short(c.node()), firstline) header += _( b'HG: Write commit message for the next split changeset.\n' ) else: header = _( b'HG: Splitting %s. Write commit message for the ' b'first split changeset.\n' ) % short(ctx.node()) opts.update( { b'edit': True, b'interactive': True, b'message': header + ctx.description(), } ) commands.commit(ui, repo, **pycompat.strkwargs(opts)) newctx = repo[b'.'] committed.append(newctx) if not committed: raise error.Abort(_(b'cannot split an empty revision')) scmutil.cleanupnodes( repo, {ctx.node(): [c.node() for c in committed]}, operation=b'split', fixphase=True, ) return committed[-1] def dorebase(ui, repo, src, destctx): rebase.rebase( ui, repo, rev=[revsetlang.formatspec(b'%ld', src)], dest=revsetlang.formatspec(b'%d', destctx.rev()), )