cmd/dist: skip compiling 100 packages without benchmarks in race mode
The go_test_bench:* tests run:
go test -short -race -run=^$ -benchtime=.1s -cpu=4 $PKG
... on each discovered package with any tests. (The same set used for
the "go_test:*" tests)
That set was 168 packages:
$ go tool dist test -list | grep go_test: | wc -l
168
But only 76 of those have a "func Benchmark", and running each
"go_test_bench:" test and compiling it in race mode, just to do
nothing took 1-2 seconds each.
So stop doing that and filter out the useless packages earlier. Now:
$ go tool dist test -list -race | grep go_test_bench: | wc -l
76
Should save 90-180 seconds. (or maybe 45 seconds for trybots, since
they're sharded)
Updates #17104
Change-Id: I08ccb072a0dc0454ea425540ee8e74b59f83b773
Reviewed-on: https://go-review.googlesource.com/29153
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>