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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 | 965b11c1bd82 |
| children |
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SVN-fs-dump-format-version: 2 UUID: a9c3b03d-cffa-4248-8023-ecf4b2bdf5d5 Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2009-04-29T19:26:51.708679Z PROPS-END Revision-number: 1 Prop-content-length: 112 Content-length: 112 K 7 svn:log V 10 init projA K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-04-29T19:26:52.115023Z PROPS-END Node-path: branches Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: tags Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: unrelated Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Revision-number: 2 Prop-content-length: 105 Content-length: 105 K 7 svn:log V 4 adda K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-04-29T19:26:53.109819Z PROPS-END Node-path: trunk/a Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 60b725f10c9c85c70d97880dfe8191b3 Text-content-sha1: 3f786850e387550fdab836ed7e6dc881de23001b Content-length: 12 PROPS-END a Revision-number: 3 Prop-content-length: 108 Content-length: 108 K 7 svn:log V 7 changea K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-04-29T19:26:54.073017Z PROPS-END Node-path: trunk/a Node-kind: file Node-action: change Text-content-length: 4 Text-content-md5: 0d227f1abf8c2932d342e9b99cc957eb Text-content-sha1: d7c8127a20a396cff08af086a1c695b0636f0c29 Content-length: 4 a a Revision-number: 4 Prop-content-length: 109 Content-length: 109 K 7 svn:log V 8 changea2 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-04-29T19:26:55.076032Z PROPS-END Node-path: trunk/a Node-kind: file Node-action: change Text-content-length: 6 Text-content-md5: 7d4ebf8f298d22fc349a91725b00af1c Text-content-sha1: 92f31bc48f52339253fce6cad9f2f0c95b302f7e Content-length: 6 a a a Revision-number: 5 Prop-content-length: 117 Content-length: 117 K 7 svn:log V 15 unrelatedchange K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-04-29T19:26:56.095784Z PROPS-END Node-path: unrelated/dummy Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 60b725f10c9c85c70d97880dfe8191b3 Text-content-sha1: 3f786850e387550fdab836ed7e6dc881de23001b Content-length: 12 PROPS-END a Revision-number: 6 Prop-content-length: 131 Content-length: 131 K 7 svn:log V 29 tagging trunk.v1 trunk.badtag K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-04-29T19:27:00.074864Z PROPS-END Node-path: tags/trunk.badtag Node-kind: dir Node-action: add Node-copyfrom-rev: 5 Node-copyfrom-path: trunk Node-path: tags/trunk.v1 Node-kind: dir Node-action: add Node-copyfrom-rev: 5 Node-copyfrom-path: trunk Revision-number: 7 Prop-content-length: 109 Content-length: 109 K 7 svn:log V 8 changea3 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-04-29T19:27:01.073910Z PROPS-END Node-path: trunk/a Node-kind: file Node-action: change Text-content-length: 8 Text-content-md5: d12178e74d8774e34361e0a08d1fd2b7 Text-content-sha1: cce0b2a263066e26610df9082b7b3c810f71262e Content-length: 8 a a a a Revision-number: 8 Prop-content-length: 118 Content-length: 118 K 7 svn:log V 16 fix trunk.badtag K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-04-29T19:27:04.073542Z PROPS-END Node-path: tags/trunk.goodtag Node-kind: dir Node-action: add Node-copyfrom-rev: 7 Node-copyfrom-path: tags/trunk.badtag Node-path: tags/trunk.badtag Node-action: delete Revision-number: 9 Prop-content-length: 108 Content-length: 108 K 7 svn:log V 7 changea K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-04-29T19:27:05.095204Z PROPS-END Node-path: trunk/a Node-kind: file Node-action: change Text-content-length: 10 Text-content-md5: 3f65cbdca1b64c2f8f574fccae24f3a4 Text-content-sha1: 5c077263421de2abff9dbe867921bc6810811aa2 Content-length: 10 a a a a a Revision-number: 10 Prop-content-length: 115 Content-length: 115 K 7 svn:log V 13 removegoodtag K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-04-29T19:27:06.089193Z PROPS-END Node-path: tags/trunk.goodtag Node-action: delete Revision-number: 11 Prop-content-length: 117 Content-length: 117 K 7 svn:log V 15 recreategoodtag K 10 svn:author V 7 pmezard K 8 svn:date V 27 2009-04-29T19:27:09.070471Z PROPS-END Node-path: tags/trunk.goodtag Node-kind: dir Node-action: add Node-copyfrom-rev: 10 Node-copyfrom-path: trunk