t/perf/p5311-pack-bitmaps-fetch.sh

   1 #!/bin/sh
   2
   3 test_description='performance of fetches from bitmapped packs'
   4 . ./perf-lib.sh
   5
   6 test_fetch_bitmaps () {
   7         test_expect_success 'setup test directory' '
   8                 rm -fr * .git
   9         '
  10
  11         test_perf_default_repo
  12
  13         test_expect_success 'create bitmapped server repo' '
  14                 git config pack.writebitmaps true &&
  15                 git config pack.writeBitmapLookupTable '"$1"' &&
  16                 git repack -ad
  17         '
  18
  19         # simulate a fetch from a repository that last fetched N days ago, for
  20         # various values of N. We do so by following the first-parent chain,
  21         # and assume the first entry in the chain that is N days older than the current
  22         # HEAD is where the HEAD would have been then.
  23         for days in 1 2 4 8 16 32 64 128; do
  24                 title=$(printf '%10s' "($days days)")
  25                 test_expect_success "setup revs from $days days ago" '
  26                         now=$(git log -1 --format=%ct HEAD) &&
  27                         then=$(($now - ($days * 86400))) &&
  28                         tip=$(git rev-list -1 --first-parent --until=$then HEAD) &&
  29                         {
  30                                 echo HEAD &&
  31                                 echo ^$tip
  32                         } >revs
  33                 '
  34
  35                 test_perf "server $title (lookup=$1)" '
  36                         git pack-objects --stdout --revs \
  37                                         --thin --delta-base-offset \
  38                                         <revs >tmp.pack
  39                 '
  40
  41                 test_size "size   $title" '
  42                         wc -c <tmp.pack
  43                 '
  44
  45                 test_perf "client $title (lookup=$1)" '
  46                         git index-pack --stdin --fix-thin <tmp.pack
  47                 '
  48         done
  49 }
  50
  51 test_fetch_bitmaps true
  52 test_fetch_bitmaps false
  53
  54 test_done