telegraf/plugins/system/cpu.go

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package system
import (
"fmt"
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"time"
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"github.com/influxdb/telegraf/plugins"
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"github.com/shirou/gopsutil/cpu"
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)
type CPUStats struct {
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ps PS
lastStats []cpu.CPUTimesStat
PerCPU bool `toml:"percpu"`
TotalCPU bool `toml:"totalcpu"`
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}
func NewCPUStats(ps PS) *CPUStats {
return &CPUStats{
ps: ps,
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}
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}
func (_ *CPUStats) Description() string {
return "Read metrics about cpu usage"
}
var sampleConfig = `
# Whether to report per-cpu stats or not
percpu = true
# Whether to report total system cpu stats or not
totalcpu = true
# Comment this line if you want the raw CPU time metrics
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drop = ["time_*"]
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`
func (_ *CPUStats) SampleConfig() string {
return sampleConfig
}
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func (s *CPUStats) Gather(acc plugins.Accumulator) error {
times, err := s.ps.CPUTimes(s.PerCPU, s.TotalCPU)
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if err != nil {
return fmt.Errorf("error getting CPU info: %s", err)
}
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now := time.Now()
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for i, cts := range times {
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tags := map[string]string{
"cpu": cts.CPU,
}
total := totalCpuTime(cts)
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// Add cpu time metrics
fields := map[string]interface{}{
"time_user": cts.User,
"time_system": cts.System,
"time_idle": cts.Idle,
"time_nice": cts.Nice,
"time_iowait": cts.Iowait,
"time_irq": cts.Irq,
"time_softirq": cts.Softirq,
"time_steal": cts.Steal,
"time_guest": cts.Guest,
"time_guest_nice": cts.GuestNice,
}
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// Add in percentage
if len(s.lastStats) == 0 {
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acc.AddFields("cpu", fields, tags, now)
// If it's the 1st gather, can't get CPU Usage stats yet
continue
}
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lastCts := s.lastStats[i]
lastTotal := totalCpuTime(lastCts)
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totalDelta := total - lastTotal
if totalDelta < 0 {
s.lastStats = times
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return fmt.Errorf("Error: current total CPU time is less than previous total CPU time")
}
if totalDelta == 0 {
continue
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}
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fields["usage_user"] = 100 * (cts.User - lastCts.User) / totalDelta
fields["usage_system"] = 100 * (cts.System - lastCts.System) / totalDelta
fields["usage_idle"] = 100 * (cts.Idle - lastCts.Idle) / totalDelta
fields["usage_nice"] = 100 * (cts.Nice - lastCts.Nice) / totalDelta
fields["usage_iowait"] = 100 * (cts.Iowait - lastCts.Iowait) / totalDelta
fields["usage_irq"] = 100 * (cts.Irq - lastCts.Irq) / totalDelta
fields["usage_softirq"] = 100 * (cts.Softirq - lastCts.Softirq) / totalDelta
fields["usage_steal"] = 100 * (cts.Steal - lastCts.Steal) / totalDelta
fields["usage_guest"] = 100 * (cts.Guest - lastCts.Guest) / totalDelta
fields["usage_guest_nice"] = 100 * (cts.GuestNice - lastCts.GuestNice) / totalDelta
acc.AddFields("cpu", fields, tags, now)
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}
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s.lastStats = times
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return nil
}
func totalCpuTime(t cpu.CPUTimesStat) float64 {
total := t.User + t.System + t.Nice + t.Iowait + t.Irq + t.Softirq + t.Steal +
t.Guest + t.GuestNice + t.Idle
return total
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}
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func init() {
plugins.Add("cpu", func() plugins.Plugin {
return &CPUStats{ps: &systemPS{}}
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})
}