t/perf/p5310-pack-bitmaps.sh

   1 #!/bin/sh
   2
   3 test_description='Tests pack performance using bitmaps'
   4 . ./perf-lib.sh
   5 . "${TEST_DIRECTORY}/perf/lib-bitmap.sh"
   6
   7 test_perf_large_repo
   8
   9 # note that we do everything through config,
  10 # since we want to be able to compare bitmap-aware
  11 # git versus non-bitmap git
  12 #
  13 # We intentionally use the deprecated pack.writebitmaps
  14 # config so that we can test against older versions of git.
  15 test_expect_success 'setup bitmap config' '
  16         git config pack.writebitmaps true
  17 '
  18
  19 # we need to create the tag up front such that it is covered by the repack and
  20 # thus by generated bitmaps.
  21 test_expect_success 'create tags' '
  22         git tag --message="tag pointing to HEAD" perf-tag HEAD
  23 '
  24
  25 test_perf 'repack to disk' '
  26         git repack -ad
  27 '
  28
  29 test_full_bitmap
  30
  31 test_expect_success 'create partial bitmap state' '
  32         # pick a commit to represent the repo tip in the past
  33         cutoff=$(git rev-list HEAD~100 -1) &&
  34         orig_tip=$(git rev-parse HEAD) &&
  35
  36         # now kill off all of the refs and pretend we had
  37         # just the one tip
  38         rm -rf .git/logs .git/refs/* .git/packed-refs &&
  39         git update-ref HEAD $cutoff &&
  40
  41         # and then repack, which will leave us with a nice
  42         # big bitmap pack of the "old" history, and all of
  43         # the new history will be loose, as if it had been pushed
  44         # up incrementally and exploded via unpack-objects
  45         git repack -Ad &&
  46
  47         # and now restore our original tip, as if the pushes
  48         # had happened
  49         git update-ref HEAD $orig_tip
  50 '
  51
  52 test_partial_bitmap
  53
  54 test_done