/
perf.go
61 lines (50 loc) · 1.29 KB
/
perf.go
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package main
import (
"os"
"fmt"
"flag"
"time"
"errors"
"os/exec"
"syscall"
)
func runprog(argv []string) (filesize int64, mem int64, err error) {
var attr os.ProcAttr
var stat *os.ProcessState
var proc *os.Process
exepath, err := exec.LookPath(argv[0])
if err != nil {
err = errors.New("can't find exe file.")
return
}
proc, err = os.StartProcess(exepath, argv, &attr)
if err != nil { return }
fi, err := os.Stat(exepath)
if err != nil { return }
filesize = fi.Size()
stat, err = proc.Wait()
mem = int64(stat.SysUsage().(*syscall.Rusage).Maxrss)
return
}
func average(array *[]int64) int64 {
var s int64
for i := 0; i < len(*array); i++ { s += (*array)[i] }
return int64(float32(s) / float32(len(*array)))
}
func main () {
var filesize, mem int64
var mems []int64
t := flag.Int("t", 1, "run times")
lang := flag.String("l", "--", "lang")
flag.Parse()
if *lang == "--" { lang = &(flag.Args()[0]) }
start := time.Now()
for i := 0; i < *t; i++ {
filesize, mem, _ = runprog(flag.Args())
mems = append(mems, mem)
}
dur := time.Now().Sub(start)
mem = average(&mems)
fmt.Printf("lang: %s, filesize: %d kB, runtime: %0.3f s, memory: %d kB\n",
*lang, filesize / 1024, (dur.Seconds() / float64(*t) + 0.0005), mem)
}