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runtime.go
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runtime.go
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package metrics
import (
"runtime"
"runtime/pprof"
"time"
"github.com/ethereum/go-ethereum/metrics"
)
// runtime files in this package are copied from github.com/ethereum/go-ethereum
// in order to fix the runtime metrics names to be prometheus metrics
// compatible.
var (
memStats runtime.MemStats
runtimeMetrics struct {
MemStats struct {
Alloc metrics.Gauge
BuckHashSys metrics.Gauge
DebugGC metrics.Gauge
EnableGC metrics.Gauge
Frees metrics.Gauge
HeapAlloc metrics.Gauge
HeapIdle metrics.Gauge
HeapInuse metrics.Gauge
HeapObjects metrics.Gauge
HeapReleased metrics.Gauge
HeapSys metrics.Gauge
LastGC metrics.Gauge
Lookups metrics.Gauge
Mallocs metrics.Gauge
MCacheInuse metrics.Gauge
MCacheSys metrics.Gauge
MSpanInuse metrics.Gauge
MSpanSys metrics.Gauge
NextGC metrics.Gauge
NumGC metrics.Gauge
GCCPUFraction metrics.GaugeFloat64
PauseNs metrics.Histogram
PauseTotalNs metrics.Gauge
StackInuse metrics.Gauge
StackSys metrics.Gauge
Sys metrics.Gauge
TotalAlloc metrics.Gauge
}
NumCgoCall metrics.Gauge
NumGoroutine metrics.Gauge
NumThread metrics.Gauge
ReadMemStats metrics.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 metrics.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 metrics.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 metrics.Registry) {
runtimeMetrics.MemStats.Alloc = metrics.NewGauge()
runtimeMetrics.MemStats.BuckHashSys = metrics.NewGauge()
runtimeMetrics.MemStats.DebugGC = metrics.NewGauge()
runtimeMetrics.MemStats.EnableGC = metrics.NewGauge()
runtimeMetrics.MemStats.Frees = metrics.NewGauge()
runtimeMetrics.MemStats.HeapAlloc = metrics.NewGauge()
runtimeMetrics.MemStats.HeapIdle = metrics.NewGauge()
runtimeMetrics.MemStats.HeapInuse = metrics.NewGauge()
runtimeMetrics.MemStats.HeapObjects = metrics.NewGauge()
runtimeMetrics.MemStats.HeapReleased = metrics.NewGauge()
runtimeMetrics.MemStats.HeapSys = metrics.NewGauge()
runtimeMetrics.MemStats.LastGC = metrics.NewGauge()
runtimeMetrics.MemStats.Lookups = metrics.NewGauge()
runtimeMetrics.MemStats.Mallocs = metrics.NewGauge()
runtimeMetrics.MemStats.MCacheInuse = metrics.NewGauge()
runtimeMetrics.MemStats.MCacheSys = metrics.NewGauge()
runtimeMetrics.MemStats.MSpanInuse = metrics.NewGauge()
runtimeMetrics.MemStats.MSpanSys = metrics.NewGauge()
runtimeMetrics.MemStats.NextGC = metrics.NewGauge()
runtimeMetrics.MemStats.NumGC = metrics.NewGauge()
runtimeMetrics.MemStats.GCCPUFraction = metrics.NewGaugeFloat64()
runtimeMetrics.MemStats.PauseNs = metrics.NewHistogram(metrics.NewExpDecaySample(1028, 0.015))
runtimeMetrics.MemStats.PauseTotalNs = metrics.NewGauge()
runtimeMetrics.MemStats.StackInuse = metrics.NewGauge()
runtimeMetrics.MemStats.StackSys = metrics.NewGauge()
runtimeMetrics.MemStats.Sys = metrics.NewGauge()
runtimeMetrics.MemStats.TotalAlloc = metrics.NewGauge()
runtimeMetrics.NumCgoCall = metrics.NewGauge()
runtimeMetrics.NumGoroutine = metrics.NewGauge()
runtimeMetrics.NumThread = metrics.NewGauge()
runtimeMetrics.ReadMemStats = metrics.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)
}