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path: root/metrics/runtime.go
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package metrics

import (
    "runtime"
    "runtime/pprof"
    "time"
)

var (
    memStats       runtime.MemStats
    runtimeMetrics struct {
        MemStats struct {
            Alloc         Gauge
            BuckHashSys   Gauge
            DebugGC       Gauge
            EnableGC      Gauge
            Frees         Gauge
            HeapAlloc     Gauge
            HeapIdle      Gauge
            HeapInuse     Gauge
            HeapObjects   Gauge
            HeapReleased  Gauge
            HeapSys       Gauge
            LastGC        Gauge
            Lookups       Gauge
            Mallocs       Gauge
            MCacheInuse   Gauge
            MCacheSys     Gauge
            MSpanInuse    Gauge
            MSpanSys      Gauge
            NextGC        Gauge
            NumGC         Gauge
            GCCPUFraction GaugeFloat64
            PauseNs       Histogram
            PauseTotalNs  Gauge
            StackInuse    Gauge
            StackSys      Gauge
            Sys           Gauge
            TotalAlloc    Gauge
        }
        NumCgoCall   Gauge
        NumGoroutine Gauge
        NumThread    Gauge
        ReadMemStats Timer
    }
    frees       uint64
    lookups     uint64
    mallocs     uint64
    numGC       uint32
    numCgoCalls int64

    threadCreateProfile = pprof.Lookup("threadcreate")
)

// Capture new values for the Go runtime statistics exported in
// runtime.MemStats.  This is designed to be called as a goroutine.
func CaptureRuntimeMemStats(r Registry, d time.Duration) {
    for range time.Tick(d) {
        CaptureRuntimeMemStatsOnce(r)
    }
}

// Capture new values for the Go runtime statistics exported in
// runtime.MemStats.  This is designed to be called in a background
// goroutine.  Giving a registry which has not been given to
// RegisterRuntimeMemStats will panic.
//
// Be very careful with this because runtime.ReadMemStats calls the C
// functions runtime·semacquire(&runtime·worldsema) and runtime·stoptheworld()
// and that last one does what it says on the tin.
func CaptureRuntimeMemStatsOnce(r Registry) {
    t := time.Now()
    runtime.ReadMemStats(&memStats) // This takes 50-200us.
    runtimeMetrics.ReadMemStats.UpdateSince(t)

    runtimeMetrics.MemStats.Alloc.Update(int64(memStats.Alloc))
    runtimeMetrics.MemStats.BuckHashSys.Update(int64(memStats.BuckHashSys))
    if memStats.DebugGC {
        runtimeMetrics.MemStats.DebugGC.Update(1)
    } else {
        runtimeMetrics.MemStats.DebugGC.Update(0)
    }
    if memStats.EnableGC {
        runtimeMetrics.MemStats.EnableGC.Update(1)
    } else {
        runtimeMetrics.MemStats.EnableGC.Update(0)
    }

    runtimeMetrics.MemStats.Frees.Update(int64(memStats.Frees - frees))
    runtimeMetrics.MemStats.HeapAlloc.Update(int64(memStats.HeapAlloc))
    runtimeMetrics.MemStats.HeapIdle.Update(int64(memStats.HeapIdle))
    runtimeMetrics.MemStats.HeapInuse.Update(int64(memStats.HeapInuse))
    runtimeMetrics.MemStats.HeapObjects.Update(int64(memStats.HeapObjects))
    runtimeMetrics.MemStats.HeapReleased.Update(int64(memStats.HeapReleased))
    runtimeMetrics.MemStats.HeapSys.Update(int64(memStats.HeapSys))
    runtimeMetrics.MemStats.LastGC.Update(int64(memStats.LastGC))
    runtimeMetrics.MemStats.Lookups.Update(int64(memStats.Lookups - lookups))
    runtimeMetrics.MemStats.Mallocs.Update(int64(memStats.Mallocs - mallocs))
    runtimeMetrics.MemStats.MCacheInuse.Update(int64(memStats.MCacheInuse))
    runtimeMetrics.MemStats.MCacheSys.Update(int64(memStats.MCacheSys))
    runtimeMetrics.MemStats.MSpanInuse.Update(int64(memStats.MSpanInuse))
    runtimeMetrics.MemStats.MSpanSys.Update(int64(memStats.MSpanSys))
    runtimeMetrics.MemStats.NextGC.Update(int64(memStats.NextGC))
    runtimeMetrics.MemStats.NumGC.Update(int64(memStats.NumGC - numGC))
    runtimeMetrics.MemStats.GCCPUFraction.Update(gcCPUFraction(&memStats))

    // <https://code.google.com/p/go/source/browse/src/pkg/runtime/mgc0.c>
    i := numGC % uint32(len(memStats.PauseNs))
    ii := memStats.NumGC % uint32(len(memStats.PauseNs))
    if memStats.NumGC-numGC >= uint32(len(memStats.PauseNs)) {
        for i = 0; i < uint32(len(memStats.PauseNs)); i++ {
            runtimeMetrics.MemStats.PauseNs.Update(int64(memStats.PauseNs[i]))
        }
    } else {
        if i > ii {
            for ; i < uint32(len(memStats.PauseNs)); i++ {
                runtimeMetrics.MemStats.PauseNs.Update(int64(memStats.PauseNs[i]))
            }
            i = 0
        }
        for ; i < ii; i++ {
            runtimeMetrics.MemStats.PauseNs.Update(int64(memStats.PauseNs[i]))
        }
    }
    frees = memStats.Frees
    lookups = memStats.Lookups
    mallocs = memStats.Mallocs
    numGC = memStats.NumGC

    runtimeMetrics.MemStats.PauseTotalNs.Update(int64(memStats.PauseTotalNs))
    runtimeMetrics.MemStats.StackInuse.Update(int64(memStats.StackInuse))
    runtimeMetrics.MemStats.StackSys.Update(int64(memStats.StackSys))
    runtimeMetrics.MemStats.Sys.Update(int64(memStats.Sys))
    runtimeMetrics.MemStats.TotalAlloc.Update(int64(memStats.TotalAlloc))

    currentNumCgoCalls := numCgoCall()
    runtimeMetrics.NumCgoCall.Update(currentNumCgoCalls - numCgoCalls)
    numCgoCalls = currentNumCgoCalls

    runtimeMetrics.NumGoroutine.Update(int64(runtime.NumGoroutine()))

    runtimeMetrics.NumThread.Update(int64(threadCreateProfile.Count()))
}

// Register runtimeMetrics for the Go runtime statistics exported in runtime and
// specifically runtime.MemStats.  The runtimeMetrics are named by their
// fully-qualified Go symbols, i.e. runtime.MemStats.Alloc.
func RegisterRuntimeMemStats(r Registry) {
    runtimeMetrics.MemStats.Alloc = NewGauge()
    runtimeMetrics.MemStats.BuckHashSys = NewGauge()
    runtimeMetrics.MemStats.DebugGC = NewGauge()
    runtimeMetrics.MemStats.EnableGC = NewGauge()
    runtimeMetrics.MemStats.Frees = NewGauge()
    runtimeMetrics.MemStats.HeapAlloc = NewGauge()
    runtimeMetrics.MemStats.HeapIdle = NewGauge()
    runtimeMetrics.MemStats.HeapInuse = NewGauge()
    runtimeMetrics.MemStats.HeapObjects = NewGauge()
    runtimeMetrics.MemStats.HeapReleased = NewGauge()
    runtimeMetrics.MemStats.HeapSys = NewGauge()
    runtimeMetrics.MemStats.LastGC = NewGauge()
    runtimeMetrics.MemStats.Lookups = NewGauge()
    runtimeMetrics.MemStats.Mallocs = NewGauge()
    runtimeMetrics.MemStats.MCacheInuse = NewGauge()
    runtimeMetrics.MemStats.MCacheSys = NewGauge()
    runtimeMetrics.MemStats.MSpanInuse = NewGauge()
    runtimeMetrics.MemStats.MSpanSys = NewGauge()
    runtimeMetrics.MemStats.NextGC = NewGauge()
    runtimeMetrics.MemStats.NumGC = NewGauge()
    runtimeMetrics.MemStats.GCCPUFraction = NewGaugeFloat64()
    runtimeMetrics.MemStats.PauseNs = NewHistogram(NewExpDecaySample(1028, 0.015))
    runtimeMetrics.MemStats.PauseTotalNs = NewGauge()
    runtimeMetrics.MemStats.StackInuse = NewGauge()
    runtimeMetrics.MemStats.StackSys = NewGauge()
    runtimeMetrics.MemStats.Sys = NewGauge()
    runtimeMetrics.MemStats.TotalAlloc = NewGauge()
    runtimeMetrics.NumCgoCall = NewGauge()
    runtimeMetrics.NumGoroutine = NewGauge()
    runtimeMetrics.NumThread = NewGauge()
    runtimeMetrics.ReadMemStats = NewTimer()

    r.Register("runtime.MemStats.Alloc", runtimeMetrics.MemStats.Alloc)
    r.Register("runtime.MemStats.BuckHashSys", runtimeMetrics.MemStats.BuckHashSys)
    r.Register("runtime.MemStats.DebugGC", runtimeMetrics.MemStats.DebugGC)
    r.Register("runtime.MemStats.EnableGC", runtimeMetrics.MemStats.EnableGC)
    r.Register("runtime.MemStats.Frees", runtimeMetrics.MemStats.Frees)
    r.Register("runtime.MemStats.HeapAlloc", runtimeMetrics.MemStats.HeapAlloc)
    r.Register("runtime.MemStats.HeapIdle", runtimeMetrics.MemStats.HeapIdle)
    r.Register("runtime.MemStats.HeapInuse", runtimeMetrics.MemStats.HeapInuse)
    r.Register("runtime.MemStats.HeapObjects", runtimeMetrics.MemStats.HeapObjects)
    r.Register("runtime.MemStats.HeapReleased", runtimeMetrics.MemStats.HeapReleased)
    r.Register("runtime.MemStats.HeapSys", runtimeMetrics.MemStats.HeapSys)
    r.Register("runtime.MemStats.LastGC", runtimeMetrics.MemStats.LastGC)
    r.Register("runtime.MemStats.Lookups", runtimeMetrics.MemStats.Lookups)
    r.Register("runtime.MemStats.Mallocs", runtimeMetrics.MemStats.Mallocs)
    r.Register("runtime.MemStats.MCacheInuse", runtimeMetrics.MemStats.MCacheInuse)
    r.Register("runtime.MemStats.MCacheSys", runtimeMetrics.MemStats.MCacheSys)
    r.Register("runtime.MemStats.MSpanInuse", runtimeMetrics.MemStats.MSpanInuse)
    r.Register("runtime.MemStats.MSpanSys", runtimeMetrics.MemStats.MSpanSys)
    r.Register("runtime.MemStats.NextGC", runtimeMetrics.MemStats.NextGC)
    r.Register("runtime.MemStats.NumGC", runtimeMetrics.MemStats.NumGC)
    r.Register("runtime.MemStats.GCCPUFraction", runtimeMetrics.MemStats.GCCPUFraction)
    r.Register("runtime.MemStats.PauseNs", runtimeMetrics.MemStats.PauseNs)
    r.Register("runtime.MemStats.PauseTotalNs", runtimeMetrics.MemStats.PauseTotalNs)
    r.Register("runtime.MemStats.StackInuse", runtimeMetrics.MemStats.StackInuse)
    r.Register("runtime.MemStats.StackSys", runtimeMetrics.MemStats.StackSys)
    r.Register("runtime.MemStats.Sys", runtimeMetrics.MemStats.Sys)
    r.Register("runtime.MemStats.TotalAlloc", runtimeMetrics.MemStats.TotalAlloc)
    r.Register("runtime.NumCgoCall", runtimeMetrics.NumCgoCall)
    r.Register("runtime.NumGoroutine", runtimeMetrics.NumGoroutine)
    r.Register("runtime.NumThread", runtimeMetrics.NumThread)
    r.Register("runtime.ReadMemStats", runtimeMetrics.ReadMemStats)
}