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cmd/compilebench: generate separate cpu profiles when using -count

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When the -count flag is provided,
instead of having each run overwrite the previous profile,
add a count suffix to the profile filename.
Then you can combine the profiles with

go tool pprof `go tool -n compile` <all profile files here>

This allows generation of precise profiles,
even for fast-compiling packages.

Change-Id: I006cf8fad143346b28a646a0b3582cc0f6eec310
Reviewed-on: https://go-review.googlesource.com/39718
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
This commit is contained in:
Josh Bleecher Snyder 2017-04-06 10:01:01 -07:00
parent 1cab72a478
commit ded95f530c
1 changed files with 7 additions and 3 deletions
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10
compilebench/main.go
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@ -158,7 +158,7 @@ func main() {
continue
}
if runRE == nil || runRE.MatchString(tt.name) {
runBuild(tt.name, tt.dir)
runBuild(tt.name, tt.dir, i)
}
}
}
@ -213,7 +213,7 @@ func runSize(name, path string) {
}
}
func runBuild(name, dir string) {
func runBuild(name, dir string, count int) {
switch name {
case "BenchmarkStdCmd":
runStdCmd()
@ -299,7 +299,11 @@ func runBuild(name, dir string) {
if err != nil {
log.Print(err)
}
if err := ioutil.WriteFile(*flagCpuprofile, out, 0666); err != nil {
outpath := *flagCpuprofile
if *flagCount != 1 {
outpath = fmt.Sprintf("%s_%d", outpath, count)
}
if err := ioutil.WriteFile(outpath, out, 0666); err != nil {
log.Print(err)
}
os.Remove(pkg.Dir + "/_compilebench_.cpuprof")