81 lines
2.7 KiB
Go
81 lines
2.7 KiB
Go
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package metrics
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import (
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"runtime/debug"
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"sync"
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"time"
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)
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var (
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debugMetrics struct {
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GCStats struct {
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LastGC Gauge
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NumGC Gauge
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Pause Histogram
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//PauseQuantiles Histogram
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PauseTotal Gauge
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}
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ReadGCStats Timer
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}
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gcStats debug.GCStats
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registerDebugMetricsOnce = sync.Once{}
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)
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// Capture new values for the Go garbage collector statistics exported in
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// debug.GCStats. This is designed to be called as a goroutine.
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func CaptureDebugGCStats(r Registry, d time.Duration) {
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for _ = range time.Tick(d) {
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CaptureDebugGCStatsOnce(r)
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}
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}
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// Capture new values for the Go garbage collector statistics exported in
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// debug.GCStats. This is designed to be called in a background goroutine.
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// Giving a registry which has not been given to RegisterDebugGCStats will
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// panic.
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//
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// Be careful (but much less so) with this because debug.ReadGCStats calls
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// the C function runtime·lock(runtime·mheap) which, while not a stop-the-world
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// operation, isn't something you want to be doing all the time.
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func CaptureDebugGCStatsOnce(r Registry) {
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lastGC := gcStats.LastGC
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t := time.Now()
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debug.ReadGCStats(&gcStats)
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debugMetrics.ReadGCStats.UpdateSince(t)
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debugMetrics.GCStats.LastGC.Update(int64(gcStats.LastGC.UnixNano()))
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debugMetrics.GCStats.NumGC.Update(int64(gcStats.NumGC))
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if lastGC != gcStats.LastGC && 0 < len(gcStats.Pause) {
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debugMetrics.GCStats.Pause.Update(int64(gcStats.Pause[0]))
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}
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//debugMetrics.GCStats.PauseQuantiles.Update(gcStats.PauseQuantiles)
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debugMetrics.GCStats.PauseTotal.Update(int64(gcStats.PauseTotal))
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}
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// Register metrics for the Go garbage collector statistics exported in
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// debug.GCStats. The metrics are named by their fully-qualified Go symbols,
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// i.e. debug.GCStats.PauseTotal.
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func RegisterDebugGCStats(r Registry) {
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registerDebugMetricsOnce.Do(func() {
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debugMetrics.GCStats.LastGC = NewGauge()
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debugMetrics.GCStats.NumGC = NewGauge()
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debugMetrics.GCStats.Pause = NewHistogram(NewExpDecaySample(1028, 0.015))
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//debugMetrics.GCStats.PauseQuantiles = NewHistogram(NewExpDecaySample(1028, 0.015))
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debugMetrics.GCStats.PauseTotal = NewGauge()
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debugMetrics.ReadGCStats = NewTimer()
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r.Register("debug.GCStats.LastGC", debugMetrics.GCStats.LastGC)
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r.Register("debug.GCStats.NumGC", debugMetrics.GCStats.NumGC)
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r.Register("debug.GCStats.Pause", debugMetrics.GCStats.Pause)
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//r.Register("debug.GCStats.PauseQuantiles", debugMetrics.GCStats.PauseQuantiles)
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r.Register("debug.GCStats.PauseTotal", debugMetrics.GCStats.PauseTotal)
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r.Register("debug.ReadGCStats", debugMetrics.ReadGCStats)
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})
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}
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// Allocate an initial slice for gcStats.Pause to avoid allocations during
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// normal operation.
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func init() {
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gcStats.Pause = make([]time.Duration, 11)
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}
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