+type CpuSample struct {
+ sampleTime time.Time
+ user float64
+ sys float64
+ cpus int64
+}
+
+func DoCpuStats(stderr chan<- string, cgroup Cgroup, cpus int64, user_hz float64, lastSample *CpuSample) (*CpuSample) {
+ cpuacct_stat := FindStat(stderr, cgroup, "cpuacct", "cpuacct.stat")
+ if cpuacct_stat == "" {
+ return lastSample
+ }
+ b, err := OpenAndReadAll(cpuacct_stat, stderr)
+ if err != nil {
+ return lastSample
+ }
+ nextSample := &CpuSample{time.Now(), 0, 0, cpus}
+ var userTicks, sysTicks int64
+ fmt.Sscanf(string(b), "user %d\nsystem %d", &nextSample.user, &nextSample.sys)
+ nextSample.user = float64(userTicks) / user_hz
+ nextSample.sys = float64(sysTicks) / user_hz
+
+ delta := ""
+ if lastSample != nil {
+ delta = fmt.Sprintf(" -- interval %.4f seconds %.4f user %.4f sys",
+ nextSample.sampleTime.Sub(lastSample.sampleTime).Seconds(),
+ nextSample.user - lastSample.user,
+ nextSample.sys - lastSample.sys)
+ }
+ stderr <- fmt.Sprintf("crunchstat: cpu %.4f user %.4f sys %d cpus%s",
+ nextSample.user, nextSample.sys, cpus, delta)
+ return nextSample
+}
+