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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 | 573bef78763f |
| children |
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SVN-fs-dump-format-version: 2 UUID: 644ede6c-2b81-4367-9dc8-d786514f2cde Revision-number: 0 Prop-content-length: 56 Content-length: 56 K 8 svn:date V 27 2010-05-19T20:16:07.429098Z 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 2010-05-19T20:16:07.461283Z PROPS-END Node-path: branches 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 Revision-number: 2 Prop-content-length: 106 Content-length: 106 K 7 svn:log V 5 hello K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-05-19T20:16:08.121436Z PROPS-END Node-path: branches/notinbranch Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: e29311f6f1bf1af907f9ef9f44b8328b Text-content-sha1: e983f374794de9c64e3d1c1de1d490c0756eeeff Content-length: 12 PROPS-END d 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 Node-path: trunk/b Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 3b5d5c3712955042212316173ccf37be Text-content-sha1: 89e6c98d92887913cadf06b2adb97f26cde4849b Content-length: 12 PROPS-END b Node-path: trunk/c Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 2cd6ee2c70b0bde53fbe6cac3c8b8bb1 Text-content-sha1: 2b66fd261ee5c6cfc8de7fa466bab600bcfe4f69 Content-length: 12 PROPS-END c Node-path: trunk/dir Node-kind: dir Node-action: add Prop-content-length: 10 Content-length: 10 PROPS-END Node-path: trunk/dir/e Node-kind: file Node-action: add Prop-content-length: 10 Text-content-length: 2 Text-content-md5: 9ffbf43126e33be52cd2bf7e01d627f9 Text-content-sha1: 094e3afb2fe8dfe82f63731cdcd3b999f4856cff Content-length: 12 PROPS-END e Revision-number: 3 Prop-content-length: 132 Content-length: 132 K 7 svn:log V 30 branch trunk, remove c and dir K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-05-19T20:16:11.113124Z PROPS-END Node-path: branches/old Node-kind: dir Node-action: add Node-copyfrom-rev: 2 Node-copyfrom-path: trunk Node-path: branches/old/dir Node-action: delete Node-path: branches/old/c Node-action: delete Revision-number: 4 Prop-content-length: 109 Content-length: 109 K 7 svn:log V 8 change a K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-05-19T20:16:13.060877Z 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: 5 Prop-content-length: 109 Content-length: 109 K 7 svn:log V 8 change b K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-05-19T20:16:14.066212Z PROPS-END Node-path: branches/old/b Node-kind: file Node-action: change Text-content-length: 4 Text-content-md5: 06ac26ed8b614fc0b141e4542aa067c2 Text-content-sha1: f6980469e74f7125178e88ec571e06fe6ce86e95 Content-length: 4 b b Revision-number: 6 Prop-content-length: 119 Content-length: 119 K 7 svn:log V 17 move and update c K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-05-19T20:16:16.069449Z PROPS-END Node-path: branches/old/c Node-kind: file Node-action: add Node-copyfrom-rev: 3 Node-copyfrom-path: trunk/b Text-copy-source-md5: 3b5d5c3712955042212316173ccf37be Text-copy-source-sha1: 89e6c98d92887913cadf06b2adb97f26cde4849b Text-content-length: 4 Text-content-md5: 33cb6785d50937d8d307ebb66d6259a7 Text-content-sha1: 7a6478264aa11a0f4befef356c03e83f2b1f6eba Content-length: 4 b c Node-path: trunk/b Node-action: delete Revision-number: 7 Prop-content-length: 116 Content-length: 116 K 7 svn:log V 14 change b again K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-05-19T20:16:17.070868Z PROPS-END Node-path: branches/old/b Node-kind: file Node-action: change Text-content-length: 6 Text-content-md5: cdcfb41554e2d092c13f5e6839e63577 Text-content-sha1: 17ac58cabedebea235d1b5605531d5b1559797e9 Content-length: 6 b b b Revision-number: 8 Prop-content-length: 114 Content-length: 114 K 7 svn:log V 12 move to old2 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-05-19T20:16:20.063098Z PROPS-END Node-path: branches/old2 Node-kind: dir Node-action: add Node-copyfrom-rev: 7 Node-copyfrom-path: branches/old Node-path: branches/old Node-action: delete Revision-number: 9 Prop-content-length: 118 Content-length: 118 K 7 svn:log V 16 move back to old K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-05-19T20:16:22.062931Z PROPS-END Node-path: branches/old Node-kind: dir Node-action: add Node-copyfrom-rev: 8 Node-copyfrom-path: branches/old2 Node-path: branches/old2 Node-action: delete Revision-number: 10 Prop-content-length: 118 Content-length: 118 K 7 svn:log V 16 last change to a K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-05-19T20:16:23.075562Z PROPS-END Node-path: trunk/a Node-kind: file Node-action: change Text-content-length: 2 Text-content-md5: 60b725f10c9c85c70d97880dfe8191b3 Text-content-sha1: 3f786850e387550fdab836ed7e6dc881de23001b Content-length: 2 a Revision-number: 11 Prop-content-length: 126 Content-length: 126 K 7 svn:log V 24 branch trunk@1 into old3 K 10 svn:author V 7 pmezard K 8 svn:date V 27 2010-05-19T20:16:25.107655Z PROPS-END Node-path: branches/old3 Node-kind: dir Node-action: add Node-copyfrom-rev: 1 Node-copyfrom-path: trunk