Mercurial > hg
view tests/test-revert.t @ 16120:47ee41fcf42b
largefiles: optimize update speed by only updating changed largefiles
Historically, during 'hg update', every largefile in the working copy was
hashed (which is a very expensive operation on big files) and any
largefiles that did not have a hash that matched their standin were
updated.
This patch optimizes 'hg update' by keeping track of what standins have
changed between the old and new revisions, and only updating the largefiles
that have changed. This saves a lot of time by avoiding the unecessary
calculation of a list of sha1 hashes for big files.
With this patch, the time 'hg update' takes to complete is a function of
how many largefiles need to be updated and what their size is.
Performance tests on a repository with about 80 largefiles ranging from
a few MB to about 97 MB are shown below. The tests show how long it takes
to run 'hg update' with no changes actually being updated.
Mercurial 2.1 release:
$ time hg update
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
getting changed largefiles
0 largefiles updated, 0 removed
real 0m10.045s
user 0m9.367s
sys 0m0.674s
With this patch:
$ time hg update
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
real 0m0.965s
user 0m0.845s
sys 0m0.115s
The same repsoitory, without the largefiles extension enabled:
$ time hg update
0 files updated, 0 files merged, 0 files removed, 0 files unresolved
real 0m0.799s
user 0m0.684s
sys 0m0.111s
So before the patch, 'hg update' with no changes was approximately 9.25s
slower with largefiles enabled. With this patch, it is approximately 0.165s
slower.
author | Na'Tosha Bard <natosha@unity3d.com> |
---|---|
date | Mon, 13 Feb 2012 18:37:07 +0100 |
parents | 117f9190c1ba |
children | 8c1cf3e3fe42 |
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$ "$TESTDIR/hghave" execbit || exit 80 $ hg init repo $ cd repo $ echo 123 > a $ echo 123 > c $ echo 123 > e $ hg add a c e $ hg commit -m "first" a c e nothing changed $ hg revert abort: no files or directories specified (use --all to revert all files) [255] $ hg revert --all $ echo 123 > b should show b unknown $ hg status ? b $ echo 12 > c should show b unknown and c modified $ hg status M c ? b $ hg add b should show b added and c modified $ hg status M c A b $ hg rm a should show a removed, b added and c modified $ hg status M c A b R a $ hg revert a should show b added, copy saved, and c modified $ hg status M c A b $ hg revert b should show b unknown, and c modified $ hg status M c ? b $ hg revert --no-backup c should show unknown: b $ hg status ? b $ hg add b should show b added $ hg status b A b $ rm b should show b deleted $ hg status b ! b $ hg revert -v b forgetting b should not find b $ hg status b b: * (glob) should show a c e $ ls a c e should verbosely save backup to e.orig $ echo z > e $ hg revert --all -v saving current version of e as e.orig reverting e should say no changes needed $ hg revert a no changes needed to a should say file not managed $ echo q > q $ hg revert q file not managed: q $ rm q should say file not found $ hg revert notfound notfound: no such file in rev 334a9e57682c $ touch d $ hg add d $ hg rm a $ hg commit -m "second" $ echo z > z $ hg add z $ hg st A z ? e.orig should add a, remove d, forget z $ hg revert --all -r0 adding a removing d forgetting z should forget a, undelete d $ hg revert --all -rtip forgetting a undeleting d $ rm a *.orig should silently add a $ hg revert -r0 a $ hg st a A a $ hg rm d $ hg st d R d should silently keep d removed $ hg revert -r0 d $ hg st d R d $ hg update -C 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ chmod +x c $ hg revert --all reverting c should print non-executable $ test -x c || echo non-executable non-executable $ chmod +x c $ hg commit -m exe $ chmod -x c $ hg revert --all reverting c should print executable $ test -x c && echo executable executable $ cd .. Issue241: update and revert produces inconsistent repositories $ hg init a $ cd a $ echo a >> a $ hg commit -A -d '1 0' -m a adding a $ echo a >> a $ hg commit -d '2 0' -m a $ hg update 0 1 files updated, 0 files merged, 0 files removed, 0 files unresolved $ mkdir b $ echo b > b/b should fail - no arguments $ hg revert -rtip abort: no files or directories specified (use --all to revert all files, or 'hg update 1' to update) [255] should succeed $ hg revert --all -rtip reverting a Issue332: confusing message when reverting directory $ hg ci -A -m b adding b/b created new head $ echo foobar > b/b $ mkdir newdir $ echo foo > newdir/newfile $ hg add newdir/newfile $ hg revert b newdir reverting b/b (glob) forgetting newdir/newfile (glob) $ echo foobar > b/b $ hg revert . reverting b/b (glob) reverting a rename target should revert the source $ hg mv a newa $ hg revert newa $ hg st a newa ? newa $ cd .. $ hg init ignored $ cd ignored $ echo '^ignored$' > .hgignore $ echo '^ignoreddir$' >> .hgignore $ echo '^removed$' >> .hgignore $ mkdir ignoreddir $ touch ignoreddir/file $ touch ignoreddir/removed $ touch ignored $ touch removed 4 ignored files (we will add/commit everything) $ hg st -A -X .hgignore I ignored I ignoreddir/file I ignoreddir/removed I removed $ hg ci -qAm 'add files' ignored ignoreddir/file ignoreddir/removed removed $ echo >> ignored $ echo >> ignoreddir/file $ hg rm removed ignoreddir/removed should revert ignored* and undelete *removed $ hg revert -a --no-backup reverting ignored reverting ignoreddir/file (glob) undeleting ignoreddir/removed (glob) undeleting removed $ hg st -mardi $ hg up -qC $ echo >> ignored $ hg rm removed should silently revert the named files $ hg revert --no-backup ignored removed $ hg st -mardi