func benchmarkOnce() driver.Result {
// run 'go build -a'
res := driver.MakeResult()
cmd := exec.Command("go", "build", "-o", "gobuild", "-a", "-p", os.Getenv("GOMAXPROCS"), "cmd/go")
out, err := driver.RunAndCollectSysStats(cmd, &res, 1, "build-")
if err != nil {
log.Fatalf("Failed to run 'go build -a cmd/go': %v\n%v", err, out)
}
// go command binary size
gof, err := os.Open("gobuild")
if err != nil {
log.Fatalf("Failed to open $GOROOT/bin/go: %v\n", err)
}
st, err := gof.Stat()
if err != nil {
log.Fatalf("Failed to stat $GOROOT/bin/go: %v\n", err)
}
res.Metrics["binary-size"] = uint64(st.Size())
sizef := driver.Size("gobuild")
if sizef != "" {
res.Files["sections"] = sizef
}
return res
}
func benchmark() driver.Result {
if os.Getenv("GOMAXPROCS") == "" {
os.Setenv("GOMAXPROCS", "1")
}
res := driver.MakeResult()
for i := 0; i < driver.BenchNum; i++ {
res1 := benchmarkOnce()
if res.RunTime == 0 || res.RunTime > res1.RunTime {
res = res1
}
log.Printf("Run %v: %+v\n", i, res)
}
perf1, perf2 := driver.RunUnderProfiler("go", "build", "-o", "goperf", "-a", "-p", os.Getenv("GOMAXPROCS"), "cmd/go")
if perf1 != "" {
res.Files["processes"] = perf1
}
if perf2 != "" {
res.Files["cpuprof"] = perf2
}
return res
}