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