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testing: skip extra -count iterations if there are no tests

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When running benchmarks with high -count and no tests (either at all or
filtered with -run), the time for runTests to check for tests -count
times can add a significant delay to starting benchmarks.

To avoid this delay, make runTests bail out on the second iteration if
the first found no tests to run. We expect the same tests to run every
time, so there is no reason to duplicate work.

One caveat: the testing docs do not explicitly require the same subtests
to be run on every call, so this could break tests that depend on
multiple runs to actually run all tests. I consider such tests invalid,
but some may exist.

Fixes #49050

Change-Id: I7b34f3832b31493cc089ee0555e231f4dc690154
Reviewed-on: https://go-review.googlesource.com/c/go/+/356669
Trust: Michael Pratt <mpratt@google.com>
Run-TryBot: Michael Pratt <mpratt@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Michael Pratt 2021-10-18 18:34:24 -04:00
parent 89cc528e43
commit 2c66cab8a7
1 changed files with 6 additions and 0 deletions
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6
src/testing/testing.go
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@ -1785,6 +1785,12 @@ func runTests(matchString func(pat, str string) (bool, error), tests []InternalT
if shouldFailFast() {
break
}
if i > 0 && !ran {
// There were no tests to run on the first
// iteration. This won't change, so no reason
// to keep trying.
break
}
ctx := newTestContext(*parallel, newMatcher(matchString, *match, "-test.run"))
ctx.deadline = deadline
t := &T{