107 lines
2.8 KiB
Go
107 lines
2.8 KiB
Go
package system
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import (
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"fmt"
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"github.com/influxdb/telegraf/plugins"
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"github.com/influxdb/telegraf/plugins/system/ps/cpu"
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)
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type CPUStats struct {
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ps PS
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lastStats []cpu.CPUTimesStat
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}
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func NewCPUStats(ps PS) *CPUStats {
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times, _ := ps.CPUTimes()
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stats := CPUStats{
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ps: ps,
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lastStats: times,
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}
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return &stats
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}
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func (_ *CPUStats) Description() string {
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return "Read metrics about cpu usage"
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}
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func (_ *CPUStats) SampleConfig() string { return "" }
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func (s *CPUStats) Gather(acc plugins.Accumulator) error {
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times, err := s.ps.CPUTimes()
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if err != nil {
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return fmt.Errorf("error getting CPU info: %s", err)
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}
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for i, cts := range times {
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tags := map[string]string{
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"cpu": cts.CPU,
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}
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busy, total := busyAndTotalCpuTime(cts)
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// Add total cpu numbers
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add(acc, "user", cts.User, tags)
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add(acc, "system", cts.System, tags)
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add(acc, "idle", cts.Idle, tags)
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add(acc, "nice", cts.Nice, tags)
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add(acc, "iowait", cts.Iowait, tags)
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add(acc, "irq", cts.Irq, tags)
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add(acc, "softirq", cts.Softirq, tags)
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add(acc, "steal", cts.Steal, tags)
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add(acc, "guest", cts.Guest, tags)
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add(acc, "guestNice", cts.GuestNice, tags)
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add(acc, "stolen", cts.Stolen, tags)
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add(acc, "busy", busy, tags)
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// Add in percentage
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lastCts := s.lastStats[i]
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lastBusy, lastTotal := busyAndTotalCpuTime(lastCts)
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busyDelta := busy - lastBusy
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totalDelta := total - lastTotal
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if totalDelta < 0 {
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return fmt.Errorf("Error: current total CPU time is less than previous total CPU time")
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}
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if totalDelta == 0 {
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return nil
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}
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add(acc, "percentageUser", 100*(cts.User-lastCts.User)/totalDelta, tags)
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add(acc, "percentageSystem", 100*(cts.System-lastCts.System)/totalDelta, tags)
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add(acc, "percentageIdle", 100*(cts.Idle-lastCts.Idle)/totalDelta, tags)
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add(acc, "percentageNice", 100*(cts.Nice-lastCts.Nice)/totalDelta, tags)
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add(acc, "percentageIowait", 100*(cts.Iowait-lastCts.Iowait)/totalDelta, tags)
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add(acc, "percentageIrq", 100*(cts.Irq-lastCts.Irq)/totalDelta, tags)
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add(acc, "percentageSoftirq", 100*(cts.Softirq-lastCts.Softirq)/totalDelta, tags)
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add(acc, "percentageSteal", 100*(cts.Steal-lastCts.Steal)/totalDelta, tags)
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add(acc, "percentageGuest", 100*(cts.Guest-lastCts.Guest)/totalDelta, tags)
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add(acc, "percentageGuestNice", 100*(cts.GuestNice-lastCts.GuestNice)/totalDelta, tags)
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add(acc, "percentageStolen", 100*(cts.Stolen-lastCts.Stolen)/totalDelta, tags)
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add(acc, "percentageBusy", 100*busyDelta/totalDelta, tags)
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}
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s.lastStats = times
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return nil
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}
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func busyAndTotalCpuTime(t cpu.CPUTimesStat) (float64, float64) {
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busy := t.User + t.System + t.Nice + t.Iowait + t.Irq + t.Softirq + t.Steal +
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t.Guest + t.GuestNice + t.Stolen
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return busy, busy + t.Idle
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}
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func init() {
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plugins.Add("cpu", func() plugins.Plugin {
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realPS := &systemPS{}
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return NewCPUStats(realPS)
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})
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}
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