t/perf/fsmonitor: add benchmark for dirty status

nipunn1313 · gitster · commit 1c6833c800ad · 2020-10-26T16:39:34.000-07:00
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 &lt;nipunn@dropbox.com&gt;
Signed-off-by: Junio C Hamano &lt;gitster@pobox.com&gt;
diff --git 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
 	'

Original file line number	Diff line number	Diff line change
`@@ -165,6 +165,11 @@ test_fsmonitor_suite() {`
`165`	`165`	`git status -uall`
`166`	`166`	`'`
`167`	`167`
	`168`	`+ test_perf_w_drop_caches "status (dirty) ($DESC)" '`
	`169`	`+ git ls-files \| head -100000 \| xargs -d "\n" touch -h &&`
	`170`	`+ git status`
	`171`	`+ '`
	`172`	`+`
`168`	`173`	`test_perf_w_drop_caches "diff ($DESC)" '`
`169`	`174`	`git diff`
`170`	`175`	`'`