Mercurial > hg
annotate tests/test-mq-symlinks.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> |
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date | Mon, 13 Feb 2012 18:37:07 +0100 |
parents | ea3d548132cc |
children | 4f795f5fbb0b |
rev | line source |
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1 $ "$TESTDIR/hghave" symlink || exit 80 |
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2 |
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3 $ echo "[extensions]" >> $HGRCPATH |
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4 $ echo "mq=" >> $HGRCPATH |
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5 |
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6 $ hg init |
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7 $ hg qinit |
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8 $ hg qnew base.patch |
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9 $ echo aaa > a |
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10 $ echo bbb > b |
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11 $ echo ccc > c |
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12 $ hg add a b c |
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13 $ hg qrefresh |
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14 $ $TESTDIR/readlink.py a |
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15 a -> a not a symlink |
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17 |
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18 test replacing a file with a symlink |
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20 $ hg qnew symlink.patch |
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21 $ rm a |
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22 $ ln -s b a |
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23 $ hg qrefresh --git |
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24 $ $TESTDIR/readlink.py a |
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25 a -> b |
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26 |
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27 $ hg qpop |
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28 popping symlink.patch |
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29 now at: base.patch |
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30 $ hg qpush |
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31 applying symlink.patch |
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32 now at: symlink.patch |
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33 $ $TESTDIR/readlink.py a |
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34 a -> b |
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35 |
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36 |
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37 test updating a symlink |
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38 |
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39 $ rm a |
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40 $ ln -s c a |
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41 $ hg qnew --git -f updatelink |
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42 $ $TESTDIR/readlink.py a |
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43 a -> c |
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44 $ hg qpop |
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45 popping updatelink |
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46 now at: symlink.patch |
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47 $ hg qpush --debug |
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48 applying updatelink |
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49 patching file a |
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50 a |
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51 now at: updatelink |
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52 $ $TESTDIR/readlink.py a |
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53 a -> c |
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54 $ hg st |
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55 |
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56 |
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57 test replacing a symlink with a file |
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59 $ ln -s c s |
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60 $ hg add s |
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61 $ hg qnew --git -f addlink |
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62 $ rm s |
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63 $ echo sss > s |
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64 $ hg qnew --git -f replacelinkwithfile |
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65 $ hg qpop |
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66 popping replacelinkwithfile |
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67 now at: addlink |
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68 $ hg qpush |
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69 applying replacelinkwithfile |
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70 now at: replacelinkwithfile |
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71 $ cat s |
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72 sss |
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73 $ hg st |
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75 |
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76 test symlink removal |
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77 |
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78 $ hg qnew removesl.patch |
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79 $ hg rm a |
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80 $ hg qrefresh --git |
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81 $ hg qpop |
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82 popping removesl.patch |
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83 now at: replacelinkwithfile |
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84 $ hg qpush |
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85 applying removesl.patch |
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86 now at: removesl.patch |
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87 $ hg st -c |
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88 C b |
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89 C c |
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90 C s |
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93 |
12345 | 94 $ ln -s linka linka |
95 $ hg add linka | |
96 $ hg qnew link | |
97 $ hg mv linka linkb | |
12398 | 98 $ rm linkb |
99 $ ln -s linkb linkb | |
12345 | 100 $ hg qnew movelink |
101 $ hg qpop | |
102 popping movelink | |
103 now at: link | |
104 $ hg qpush | |
105 applying movelink | |
106 now at: movelink | |
107 $ $TESTDIR/readlink.py linkb | |
108 linkb -> linkb |