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