Mercurial > hg
annotate tests/test-sparse-revlog.t @ 39505:c6b8eab5db19
snapshot: also consider the snapshot chain of one unrelated revision
To maximize the chance of good delta chain reuse, we inject an unrelated delta
chain into our search. To do so, we search for the highest revision unrelated
to the parents of the current revision and use its snapshot chain too.
Adding this extra snapshot into the mix can have a performance impact. We'll
deal with performance impact in a later series.
author | Boris Feld <boris.feld@octobus.net> |
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date | Fri, 07 Sep 2018 11:18:45 -0400 |
parents | 5aef5afa8654 |
children | b66ea3fc3a86 |
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1 ==================================== |
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2 Test delta choice with sparse revlog |
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3 ==================================== |
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4 |
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5 Sparse-revlog usually shows the most gain on Manifest. However, it is simpler |
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6 to general an appropriate file, so we test with a single file instead. The |
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7 goal is to observe intermediate snapshot being created. |
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8 |
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9 We need a large enough file. Part of the content needs to be replaced |
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10 repeatedly while some of it changes rarely. |
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11 |
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12 $ bundlepath="$TESTDIR/artifacts/cache/big-file-churn.hg" |
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13 |
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14 $ expectedhash=`cat "$bundlepath".md5` |
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15 $ if [ ! -f "$bundlepath" ]; then |
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16 > echo 'skipped: missing artifact, run "'"$TESTDIR"'/artifacts/scripts/generate-churning-bundle.py"' |
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17 > exit 80 |
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18 > fi |
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19 $ currenthash=`f -M "$bundlepath" | cut -d = -f 2` |
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20 $ if [ "$currenthash" != "$expectedhash" ]; then |
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21 > echo 'skipped: outdated artifact, md5 "'"$currenthash"'" expected "'"$expectedhash"'" run "'"$TESTDIR"'/artifacts/scripts/generate-churning-bundle.py"' |
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22 > exit 80 |
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23 > fi |
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24 |
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25 $ cat >> $HGRCPATH << EOF |
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26 > [format] |
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27 > sparse-revlog = yes |
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28 > [storage] |
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29 > revlog.optimize-delta-parent-choice = yes |
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30 > EOF |
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31 $ hg init sparse-repo |
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32 $ cd sparse-repo |
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33 $ hg unbundle $bundlepath |
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34 adding changesets |
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35 adding manifests |
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36 adding file changes |
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37 added 5001 changesets with 5001 changes to 1 files (+89 heads) |
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38 new changesets 9706f5af64f4:d9032adc8114 (5001 drafts) |
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39 (run 'hg heads' to see heads, 'hg merge' to merge) |
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40 $ hg up |
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41 1 files updated, 0 files merged, 0 files removed, 0 files unresolved |
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42 updated to "d9032adc8114: commit #5000" |
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43 89 other heads for branch "default" |
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44 |
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45 $ hg log --stat -r 0:3 |
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46 changeset: 0:9706f5af64f4 |
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47 user: test |
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48 date: Thu Jan 01 00:00:00 1970 +0000 |
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49 summary: initial commit |
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50 |
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51 SPARSE-REVLOG-TEST-FILE | 10500 ++++++++++++++++++++++++++++++++++++++++++++++ |
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52 1 files changed, 10500 insertions(+), 0 deletions(-) |
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53 |
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54 changeset: 1:724907deaa5e |
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55 user: test |
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56 date: Thu Jan 01 00:00:00 1970 +0000 |
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57 summary: commit #1 |
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58 |
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59 SPARSE-REVLOG-TEST-FILE | 1068 +++++++++++++++++++++++----------------------- |
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60 1 files changed, 534 insertions(+), 534 deletions(-) |
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61 |
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62 changeset: 2:62c41bce3e5d |
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63 user: test |
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64 date: Thu Jan 01 00:00:00 1970 +0000 |
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65 summary: commit #2 |
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66 |
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67 SPARSE-REVLOG-TEST-FILE | 1068 +++++++++++++++++++++++----------------------- |
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68 1 files changed, 534 insertions(+), 534 deletions(-) |
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69 |
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70 changeset: 3:348a9cbd6959 |
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71 user: test |
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72 date: Thu Jan 01 00:00:00 1970 +0000 |
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73 summary: commit #3 |
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74 |
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75 SPARSE-REVLOG-TEST-FILE | 1068 +++++++++++++++++++++++----------------------- |
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76 1 files changed, 534 insertions(+), 534 deletions(-) |
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77 |
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78 |
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79 $ f -s .hg/store/data/*.d |
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80 .hg/store/data/_s_p_a_r_s_e-_r_e_v_l_o_g-_t_e_s_t-_f_i_l_e.d: size=59230936 |
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81 $ hg debugrevlog * |
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82 format : 1 |
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83 flags : generaldelta |
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84 |
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85 revisions : 5001 |
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86 merges : 625 (12.50%) |
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87 normal : 4376 (87.50%) |
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88 revisions : 5001 |
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89 empty : 0 ( 0.00%) |
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90 text : 0 (100.00%) |
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91 delta : 0 (100.00%) |
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92 snapshot : 176 ( 3.52%) |
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93 lvl-0 : 3 ( 0.06%) |
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94 lvl-1 : 17 ( 0.34%) |
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95 lvl-2 : 45 ( 0.90%) |
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96 lvl-3 : 56 ( 1.12%) |
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97 lvl-4 : 55 ( 1.10%) |
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98 deltas : 4825 (96.48%) |
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99 revision size : 59230936 |
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100 snapshot : 5770371 ( 9.74%) |
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101 lvl-0 : 602962 ( 1.02%) |
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102 lvl-1 : 1534153 ( 2.59%) |
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103 lvl-2 : 1604445 ( 2.71%) |
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104 lvl-3 : 1218174 ( 2.06%) |
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105 lvl-4 : 810637 ( 1.37%) |
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106 deltas : 53460565 (90.26%) |
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107 |
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108 chunks : 5001 |
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109 0x78 (x) : 5001 (100.00%) |
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110 chunks size : 59230936 |
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111 0x78 (x) : 59230936 (100.00%) |
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112 |
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113 avg chain length : 17 |
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114 max chain length : 45 |
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115 max chain reach : 25326012 |
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116 compression ratio : 29 |
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117 |
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118 uncompressed data size (min/max/avg) : 346468 / 346472 / 346471 |
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119 full revision size (min/max/avg) : 200897 / 201050 / 200987 |
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120 inter-snapshot size (min/max/avg) : 11598 / 171990 / 29869 |
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121 level-1 (min/max/avg) : 14037 / 171990 / 90244 |
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122 level-2 (min/max/avg) : 11632 / 84456 / 35654 |
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123 level-3 (min/max/avg) : 11598 / 41486 / 21753 |
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124 level-4 (min/max/avg) : 11618 / 19913 / 14738 |
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125 delta size (min/max/avg) : 10649 / 105209 / 11079 |
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126 |
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127 deltas against prev : 4156 (86.13%) |
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128 where prev = p1 : 4120 (99.13%) |
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129 where prev = p2 : 0 ( 0.00%) |
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130 other : 36 ( 0.87%) |
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131 deltas against p1 : 646 (13.39%) |
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132 deltas against p2 : 23 ( 0.48%) |
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133 deltas against other : 0 ( 0.00%) |