91 lines
2 KiB
Go
91 lines
2 KiB
Go
// +build linux freebsd darwin
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package cpu
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import (
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"fmt"
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"time"
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)
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func getAllBusy(t TimesStat) (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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func calculateBusy(t1, t2 TimesStat) 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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func calculateAllBusy(t1, t2 []TimesStat) ([]float64, error) {
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// Make sure the CPU measurements have the same length.
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if len(t1) != len(t2) {
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return nil, fmt.Errorf(
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"received two CPU counts: %d != %d",
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len(t1), len(t2),
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)
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}
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ret := make([]float64, len(t1))
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for i, t := range t2 {
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ret[i] = calculateBusy(t1[i], t)
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}
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return ret, nil
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}
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//Percent calculates the percentage of cpu used either per CPU or combined.
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//If an interval of 0 is given it will compare the current cpu times against the last call.
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func Percent(interval time.Duration, percpu bool) ([]float64, error) {
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if interval <= 0 {
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return percentUsedFromLastCall(percpu)
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}
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// Get CPU usage at the start of the interval.
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cpuTimes1, err := Times(percpu)
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if err != nil {
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return nil, err
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}
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time.Sleep(interval)
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// And at the end of the interval.
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cpuTimes2, err := Times(percpu)
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if err != nil {
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return nil, err
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}
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return calculateAllBusy(cpuTimes1, cpuTimes2)
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}
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func percentUsedFromLastCall(percpu bool) ([]float64, error) {
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cpuTimes, err := Times(percpu)
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if err != nil {
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return nil, err
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}
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lastCPUPercent.Lock()
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defer lastCPUPercent.Unlock()
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var lastTimes []TimesStat
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if percpu {
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lastTimes = lastCPUPercent.lastPerCPUTimes
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lastCPUPercent.lastPerCPUTimes = cpuTimes
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} else {
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lastTimes = lastCPUPercent.lastCPUTimes
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lastCPUPercent.lastCPUTimes = cpuTimes
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}
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if lastTimes == nil {
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return nil, fmt.Errorf("Error getting times for cpu percent. LastTimes was nil")
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}
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return calculateAllBusy(lastTimes, cpuTimes)
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}
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