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cpu_unix.go
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/
cpu_unix.go
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// +build linux freebsd darwin
package cpu
import "time"
func init() {
lastCPUTimes, _ = CPUTimes(false)
lastPerCPUTimes, _ = CPUTimes(true)
}
func CPUPercent(interval time.Duration, percpu bool) ([]float64, error) {
getAllBusy := func(t CPUTimesStat) (float64, float64) {
busy := t.User + t.System + t.Nice + t.Iowait + t.Irq +
t.Softirq + t.Steal + t.Guest + t.GuestNice + t.Stolen
return busy + t.Idle, busy
}
calculate := func(t1, t2 CPUTimesStat) float64 {
t1All, t1Busy := getAllBusy(t1)
t2All, t2Busy := getAllBusy(t2)
if t2Busy <= t1Busy {
return 0
}
if t2All <= t1All {
return 1
}
return (t2Busy - t1Busy) / (t2All - t1All) * 100
}
cpuTimes, err := CPUTimes(percpu)
if err != nil {
return nil, err
}
if interval > 0 {
if !percpu {
lastCPUTimes = cpuTimes
} else {
lastPerCPUTimes = cpuTimes
}
time.Sleep(interval)
cpuTimes, err = CPUTimes(percpu)
if err != nil {
return nil, err
}
}
ret := make([]float64, len(cpuTimes))
if !percpu {
ret[0] = calculate(lastCPUTimes[0], cpuTimes[0])
lastCPUTimes = cpuTimes
} else {
for i, t := range cpuTimes {
ret[i] = calculate(lastPerCPUTimes[i], t)
}
lastPerCPUTimes = cpuTimes
}
return ret, nil
}