blob: 76c546320b30e91ebacf7bc78b039386a3927853 [file] [log] [blame]
// Copyright 2013 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// +build darwin dragonfly freebsd linux netbsd openbsd solaris
package driver
import (
"bytes"
"log"
"os/exec"
"syscall"
"time"
"golang.org/x/sys/unix"
)
type sysStats struct {
N uint64
Rusage unix.Rusage
}
func InitSysStats(N uint64) sysStats {
ss := sysStats{N: N}
if err := unix.Getrusage(0, &ss.Rusage); err != nil {
log.Printf("Getrusage failed: %v", err)
ss.N = 0
// Deliberately ignore the error.
}
return ss
}
func (ss sysStats) Collect(res *Result) {
if ss.N == 0 {
return
}
if vm := getVMPeak(); vm != 0 {
res.Metrics["peak-VM-bytes"] = vm
}
usage := new(unix.Rusage)
if err := unix.Getrusage(0, usage); err != nil {
log.Printf("Getrusage failed: %v", err)
// Deliberately ignore the error.
return
}
res.Metrics["peak-RSS-bytes"] = uint64(usage.Maxrss) * rssMultiplier
res.Metrics["user+sys-ns/op"] = (cpuTime(usage) - cpuTime(&ss.Rusage)) / ss.N
}
func RunAndCollectSysStats(cmd *exec.Cmd, res *Result, N uint64, prefix string) (string, error) {
var out bytes.Buffer
cmd.Stdout = &out
cmd.Stderr = &out
t0 := time.Now()
if err := cmd.Run(); err != nil {
return out.String(), err
}
t1 := time.Now()
usage := fromStdUsage(cmd.ProcessState.SysUsage().(*syscall.Rusage))
res.RunTime = uint64(t1.Sub(t0)) / N
res.Metrics[prefix+"ns/op"] = res.RunTime
res.Metrics[prefix+"user+sys-ns/op"] = cpuTime(usage) / N
res.Metrics[prefix+"peak-RSS-bytes"] = uint64(usage.Maxrss) * rssMultiplier
return out.String(), nil
}
func cpuTime(usage *unix.Rusage) uint64 {
return uint64(usage.Utime.Sec)*1e9 + uint64(usage.Utime.Usec*1e3) +
uint64(usage.Stime.Sec)*1e9 + uint64(usage.Stime.Usec)*1e3
}
func fromStdUsage(su *syscall.Rusage) *unix.Rusage {
return &unix.Rusage{
Utime: unix.Timeval{Sec: su.Utime.Sec, Usec: su.Utime.Usec},
Stime: unix.Timeval{Sec: su.Stime.Sec, Usec: su.Stime.Usec},
Maxrss: su.Maxrss,
Ixrss: su.Ixrss,
Idrss: su.Idrss,
Isrss: su.Isrss,
Minflt: su.Minflt,
Majflt: su.Majflt,
Nswap: su.Nswap,
Inblock: su.Inblock,
Oublock: su.Oublock,
Msgsnd: su.Msgsnd,
Msgrcv: su.Msgrcv,
Nsignals: su.Nsignals,
Nvcsw: su.Nvcsw,
Nivcsw: su.Nivcsw,
}
}