t/perf/p7519-fsmonitor.sh

   1 #!/bin/sh
   2
   3 test_description="Test core.fsmonitor"
   4
   5 . ./perf-lib.sh
   6
   7 #
   8 # Performance test for the fsmonitor feature which enables git to talk to a
   9 # file system change monitor and avoid having to scan the working directory
  10 # for new or modified files.
  11 #
  12 # By default, the performance test will utilize the Watchman file system
  13 # monitor if it is installed.  If Watchman is not installed, it will use a
  14 # dummy integration script that does not report any new or modified files.
  15 # The dummy script has very little overhead which provides optimistic results.
  16 #
  17 # The performance test will also use the untracked cache feature if it is
  18 # available as fsmonitor uses it to speed up scanning for untracked files.
  19 #
  20 # There are 3 environment variables that can be used to alter the default
  21 # behavior of the performance test:
  22 #
  23 # GIT_PERF_7519_UNTRACKED_CACHE: used to configure core.untrackedCache
  24 # GIT_PERF_7519_SPLIT_INDEX: used to configure core.splitIndex
  25 # GIT_PERF_7519_FSMONITOR: used to configure core.fsMonitor
  26 #
  27 # The big win for using fsmonitor is the elimination of the need to scan the
  28 # working directory looking for changed and untracked files. If the file
  29 # information is all cached in RAM, the benefits are reduced.
  30 #
  31 # GIT_PERF_7519_DROP_CACHE: if set, the OS caches are dropped between tests
  32 #
  33
  34 test_perf_large_repo
  35 test_checkout_worktree
  36
  37 test_lazy_prereq UNTRACKED_CACHE '
  38         { git update-index --test-untracked-cache; ret=$?; } &&
  39         test $ret -ne 1
  40 '
  41
  42 test_lazy_prereq WATCHMAN '
  43         command -v watchman
  44 '
  45
  46 if test_have_prereq WATCHMAN
  47 then
  48         # Convert unix style paths to escaped Windows style paths for Watchman
  49         case "$(uname -s)" in
  50         MSYS_NT*)
  51           GIT_WORK_TREE="$(cygpath -aw "$PWD" | sed 's,\\,/,g')"
  52           ;;
  53         *)
  54           GIT_WORK_TREE="$PWD"
  55           ;;
  56         esac
  57 fi
  58
  59 if test -n "$GIT_PERF_7519_DROP_CACHE"
  60 then
  61         # When using GIT_PERF_7519_DROP_CACHE, GIT_PERF_REPEAT_COUNT must be 1 to
  62         # generate valid results. Otherwise the caching that happens for the nth
  63         # run will negate the validity of the comparisons.
  64         if test "$GIT_PERF_REPEAT_COUNT" -ne 1
  65         then
  66                 echo "warning: Setting GIT_PERF_REPEAT_COUNT=1" >&2
  67                 GIT_PERF_REPEAT_COUNT=1
  68         fi
  69 fi
  70
  71 test_expect_success "setup for fsmonitor" '
  72         # set untrackedCache depending on the environment
  73         if test -n "$GIT_PERF_7519_UNTRACKED_CACHE"
  74         then
  75                 git config core.untrackedCache "$GIT_PERF_7519_UNTRACKED_CACHE"
  76         else
  77                 if test_have_prereq UNTRACKED_CACHE
  78                 then
  79                         git config core.untrackedCache true
  80                 else
  81                         git config core.untrackedCache false
  82                 fi
  83         fi &&
  84
  85         # set core.splitindex depending on the environment
  86         if test -n "$GIT_PERF_7519_SPLIT_INDEX"
  87         then
  88                 git config core.splitIndex "$GIT_PERF_7519_SPLIT_INDEX"
  89         fi &&
  90
  91         # set INTEGRATION_SCRIPT depending on the environment
  92         if test -n "$GIT_PERF_7519_FSMONITOR"
  93         then
  94                 INTEGRATION_SCRIPT="$GIT_PERF_7519_FSMONITOR"
  95         else
  96                 #
  97                 # Choose integration script based on existence of Watchman.
  98                 # If Watchman exists, watch the work tree and attempt a query.
  99                 # If everything succeeds, use Watchman integration script,
 100                 # else fall back to an empty integration script.
 101                 #
 102                 mkdir .git/hooks &&
 103                 if test_have_prereq WATCHMAN
 104                 then
 105                         INTEGRATION_SCRIPT=".git/hooks/fsmonitor-watchman" &&
 106                         cp "$TEST_DIRECTORY/../templates/hooks--fsmonitor-watchman.sample" "$INTEGRATION_SCRIPT" &&
 107                         watchman watch "$GIT_WORK_TREE" &&
 108                         watchman watch-list | grep -q -F "$GIT_WORK_TREE"
 109                 else
 110                         INTEGRATION_SCRIPT=".git/hooks/fsmonitor-empty" &&
 111                         write_script "$INTEGRATION_SCRIPT"<<-\EOF
 112                         EOF
 113                 fi
 114         fi &&
 115
 116         git config core.fsmonitor "$INTEGRATION_SCRIPT" &&
 117         git update-index --fsmonitor
 118 '
 119
 120 if test -n "$GIT_PERF_7519_DROP_CACHE"; then
 121         test-drop-caches
 122 fi
 123
 124 test_perf "status (fsmonitor=$INTEGRATION_SCRIPT)" '
 125         git status
 126 '
 127
 128 if test -n "$GIT_PERF_7519_DROP_CACHE"; then
 129         test-drop-caches
 130 fi
 131
 132 test_perf "status -uno (fsmonitor=$INTEGRATION_SCRIPT)" '
 133         git status -uno
 134 '
 135
 136 if test -n "$GIT_PERF_7519_DROP_CACHE"; then
 137         test-drop-caches
 138 fi
 139
 140 test_perf "status -uall (fsmonitor=$INTEGRATION_SCRIPT)" '
 141         git status -uall
 142 '
 143
 144 test_expect_success "setup without fsmonitor" '
 145         unset INTEGRATION_SCRIPT &&
 146         git config --unset core.fsmonitor &&
 147         git update-index --no-fsmonitor
 148 '
 149
 150 if test -n "$GIT_PERF_7519_DROP_CACHE"; then
 151         test-drop-caches
 152 fi
 153
 154 test_perf "status (fsmonitor=$INTEGRATION_SCRIPT)" '
 155         git status
 156 '
 157
 158 if test -n "$GIT_PERF_7519_DROP_CACHE"; then
 159         test-drop-caches
 160 fi
 161
 162 test_perf "status -uno (fsmonitor=$INTEGRATION_SCRIPT)" '
 163         git status -uno
 164 '
 165
 166 if test -n "$GIT_PERF_7519_DROP_CACHE"; then
 167         test-drop-caches
 168 fi
 169
 170 test_perf "status -uall (fsmonitor=$INTEGRATION_SCRIPT)" '
 171         git status -uall
 172 '
 173
 174 if test_have_prereq WATCHMAN
 175 then
 176         watchman watch-del "$GIT_WORK_TREE" >/dev/null 2>&1 &&
 177
 178         # Work around Watchman bug on Windows where it holds on to handles
 179         # preventing the removal of the trash directory
 180         watchman shutdown-server >/dev/null 2>&1
 181 fi
 182
 183 test_done