t/perf/fsmonitor: add benchmark for dirty status

This benchmark covers the git status time for a heavily
dirty directory - benchmarking fsmonitor's refresh

When running to compare our perl vs rs-git-fsmonitor - we see that
the perl script incurs significant overhead - further motivation
to provide a faster implementation within git.

7519.7: status (dirty) (fsmonitor=query-watchman) 10.05(7.78+1.56)
7519.20: status (dirty) (fsmonitor=rs-git-fsmonitor) 6.72(4.37+1.64)
7519.33: status (dirty) (fsmonitor=disabled) 5.62(4.24+2.03)

Signed-off-by: Nipunn Koorapati <nipunn@dropbox.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/perf/p7519-fsmonitor.sh b/t/perf/p7519-fsmonitor.sh
index 577f79d4556fe85a8a30243f07cfdde74e64c442..163a13bea36f59d716e0c06336ade0738941d241 100755 (executable)
--- a/t/perf/p7519-fsmonitor.sh
+++ b/t/perf/p7519-fsmonitor.sh
@@ -165,6 +165,11 @@ test_fsmonitor_suite() {
                git status -uall
        '
 
+       test_perf_w_drop_caches "status (dirty) ($DESC)" '
+               git ls-files | head -100000 | xargs -d "\n" touch -h &&
+               git status
+       '
+
        test_perf_w_drop_caches "diff ($DESC)" '
                git diff
        '