Mercurial > hg
annotate tests/test-repo-compengines.t @ 42043:1fac9b931d46
compression: introduce a `storage.revlog.zlib.level` configuration
This option control the zlib compression level used when compression revlog
chunk.
This is also a good excuse to pave the way for a similar configuration option
for the zstd compression engine. Having a dedicated option for each compression
algorithm is useful because they don't support the same range of values.
Using a higher zlib compression impact CPU consumption at compression time, but
does not directly affected decompression time. However dealing with small
compressed chunk can directly help decompression and indirectly help other
revlog logic.
I ran some basic test on repositories using different level. I am using the
mercurial, pypy, netbeans and mozilla-central clone from our benchmark suite.
All tested repository use sparse-revlog and got all their delta recomputed.
The different compression level has a small effect on the repository size
(about 10% variation in the total range). My quick analysis is that revlog
mostly store small delta, that are not affected by the compression level much.
So the variation probably mostly comes from better compression of the snapshots
revisions, and snapshot revision only represent a small portion of the
repository content.
I also made some basic timings measurements. The "read" timings are gathered using
simple run of `hg perfrevlogrevisions`, the "write" timings using `hg
perfrevlogwrite` (restricted to the last 5000 revisions for netbeans and
mozilla central). The timings are gathered on a generic machine, (not one of
our performance locked machine), so small variation might not be meaningful.
However large trend remains relevant.
Keep in mind that these numbers are not pure compression/decompression time.
They also involve the full revlog logic. In particular the difference in chunk
size has an impact on the delta chain structure, affecting performance when
writing or reading them.
On read/write performance, the compression level has a bigger impact.
Counter-intuitively, the higher compression levels improve "write" performance
for the large repositories in our tested setting. Maybe because the last 5000
delta chain end up having a very different shape in this specific spot? Or maybe
because of a more general trend of better delta chains thanks to the smaller
chunk and snapshot.
This series does not intend to change the default compression level. However,
these result call for a deeper analysis of this performance difference in the
future.
Full data
=========
repo level .hg/store size 00manifest.d read write
----------------------------------------------------------------
mercurial 1 49,402,813 5,963,475 0.170159 53.250304
mercurial 6 47,197,397 5,875,730 0.182820 56.264320
mercurial 9 47,121,596 5,849,781 0.189219 56.293612
pypy 1 370,830,572 28,462,425 2.679217 460.721984
pypy 6 340,112,317 27,648,747 2.768691 467.537158
pypy 9 338,360,736 27,639,003 2.763495 476.589918
netbeans 1 1,281,847,810 165,495,457 122.477027 520.560316
netbeans 6 1,205,284,353 159,161,207 139.876147 715.930400
netbeans 9 1,197,135,671 155,034,586 141.620281 678.297064
mozilla 1 2,775,497,186 298,527,987 147.867662 751.263721
mozilla 6 2,596,856,420 286,597,671 170.572118 987.056093
mozilla 9 2,587,542,494 287,018,264 163.622338 739.803002
author | Pierre-Yves David <pierre-yves.david@octobus.net> |
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date | Wed, 27 Mar 2019 18:35:27 +0100 |
parents | a0886a4d6dce |
children | bb271ec2fbfb |
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1 A new repository uses zlib storage, which doesn't need a requirement |
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2 |
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3 $ hg init default |
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4 $ cd default |
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5 $ cat .hg/requires |
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6 dotencode |
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7 fncache |
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8 generaldelta |
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9 revlogv1 |
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10 sparserevlog |
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11 store |
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12 testonly-simplestore (reposimplestore !) |
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13 |
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14 $ touch foo |
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15 $ hg -q commit -A -m 'initial commit with a lot of repeated repeated repeated text to trigger compression' |
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16 $ hg debugrevlog -c | grep 0x78 |
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17 0x78 (x) : 1 (100.00%) |
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18 0x78 (x) : 110 (100.00%) |
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19 |
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20 $ cd .. |
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21 |
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22 Unknown compression engine to format.compression aborts |
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23 |
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24 $ hg --config experimental.format.compression=unknown init unknown |
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25 abort: compression engine unknown defined by experimental.format.compression not available |
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26 (run "hg debuginstall" to list available compression engines) |
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27 [255] |
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28 |
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29 A requirement specifying an unknown compression engine results in bail |
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30 |
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31 $ hg init unknownrequirement |
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32 $ cd unknownrequirement |
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33 $ echo exp-compression-unknown >> .hg/requires |
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34 $ hg log |
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35 abort: repository requires features unknown to this Mercurial: exp-compression-unknown! |
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36 (see https://mercurial-scm.org/wiki/MissingRequirement for more information) |
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37 [255] |
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38 |
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39 $ cd .. |
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40 |
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41 #if zstd |
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42 |
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43 $ hg --config experimental.format.compression=zstd init zstd |
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44 $ cd zstd |
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45 $ cat .hg/requires |
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46 dotencode |
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47 exp-compression-zstd |
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48 fncache |
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49 generaldelta |
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50 revlogv1 |
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51 sparserevlog |
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52 store |
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53 testonly-simplestore (reposimplestore !) |
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54 |
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55 $ touch foo |
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56 $ hg -q commit -A -m 'initial commit with a lot of repeated repeated repeated text' |
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57 |
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58 $ hg debugrevlog -c | grep 0x28 |
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59 0x28 : 1 (100.00%) |
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60 0x28 : 98 (100.00%) |
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61 |
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62 $ cd .. |
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63 |
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64 Specifying a new format.compression on an existing repo won't introduce data |
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65 with that engine or a requirement |
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66 |
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67 $ cd default |
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68 $ touch bar |
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69 $ hg --config experimental.format.compression=zstd -q commit -A -m 'add bar with a lot of repeated repeated repeated text' |
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70 |
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71 $ cat .hg/requires |
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72 dotencode |
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73 fncache |
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74 generaldelta |
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75 revlogv1 |
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76 sparserevlog |
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77 store |
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78 testonly-simplestore (reposimplestore !) |
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79 |
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80 $ hg debugrevlog -c | grep 0x78 |
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81 0x78 (x) : 2 (100.00%) |
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82 0x78 (x) : 199 (100.00%) |
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83 |
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84 #endif |
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85 |
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86 checking zlib options |
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87 ===================== |
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88 |
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89 $ hg init zlib-level-default |
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90 $ hg init zlib-level-1 |
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91 $ cat << EOF >> zlib-level-1/.hg/hgrc |
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92 > [storage] |
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93 > revlog.zlib.level=1 |
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94 > EOF |
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95 $ hg init zlib-level-9 |
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96 $ cat << EOF >> zlib-level-9/.hg/hgrc |
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97 > [storage] |
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98 > revlog.zlib.level=9 |
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99 > EOF |
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100 |
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101 |
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102 $ commitone() { |
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103 > repo=$1 |
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104 > cp $RUNTESTDIR/bundles/issue4438-r1.hg $repo/a |
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105 > hg -R $repo add $repo/a |
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106 > hg -R $repo commit -m some-commit |
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107 > } |
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108 |
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109 $ for repo in zlib-level-default zlib-level-1 zlib-level-9; do |
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110 > commitone $repo |
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111 > done |
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112 |
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113 $ $RUNTESTDIR/f -s */.hg/store/data/* |
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114 zlib-level-1/.hg/store/data/a.i: size=4146 |
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115 zlib-level-9/.hg/store/data/a.i: size=4138 |
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116 zlib-level-default/.hg/store/data/a.i: size=4138 |
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117 |
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118 Test error cases |
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119 |
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120 $ hg init zlib-level-invalid |
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121 $ cat << EOF >> zlib-level-invalid/.hg/hgrc |
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122 > [storage] |
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123 > revlog.zlib.level=foobar |
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124 > EOF |
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125 $ commitone zlib-level-invalid |
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126 abort: storage.revlog.zlib.level is not a valid integer ('foobar') |
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127 abort: storage.revlog.zlib.level is not a valid integer ('foobar') |
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128 [255] |
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129 |
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130 $ hg init zlib-level-out-of-range |
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131 $ cat << EOF >> zlib-level-out-of-range/.hg/hgrc |
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132 > [storage] |
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133 > revlog.zlib.level=42 |
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134 > EOF |
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135 |
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136 $ commitone zlib-level-out-of-range |
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137 abort: invalid value for `storage.revlog.zlib.level` config: 42 |
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138 abort: invalid value for `storage.revlog.zlib.level` config: 42 |
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139 [255] |
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140 |