merge: apply non-interactive working dir updates in parallel
This has a big effect on the performance of working dir updates.
Here are the results of update from null to the given rev in several
repos, on a Linux 3.2 system with 32 cores running ext4, with the progress
extension enabled.
repo rev plain parallel speedup
hg
7068089c95a2 0.9 0.3 3
mozilla-central
fe1600b22c77 42.8 7.7 5.5
linux-2.6
9ef4b770e069 31.4 4.9 6.4
--- a/mercurial/merge.py Sat Feb 09 15:51:32 2013 -0800
+++ b/mercurial/merge.py Sat Feb 09 15:51:32 2013 -0800
@@ -7,7 +7,7 @@
from node import nullid, nullrev, hex, bin
from i18n import _
-import error, util, filemerge, copies, subrepo
+import error, util, filemerge, copies, subrepo, worker
import errno, os, shutil
class mergestate(object):
@@ -432,7 +432,9 @@
subrepo.submerge(repo, wctx, mctx, wctx, overwrite)
z = 0
- for i, item in getremove(repo, mctx, overwrite, workeractions):
+ prog = worker.worker(repo.ui, 0.001, getremove, (repo, mctx, overwrite),
+ workeractions)
+ for i, item in prog:
z += i
repo.ui.progress(_('updating'), z, item=item, total=numupdates,
unit=_('files'))