97 lines
3.6 KiB
Go
97 lines
3.6 KiB
Go
// Package metrics provides general system and process level metrics collection.
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package metrics
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import (
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"os"
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"runtime"
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"strings"
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"time"
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"github.com/ethereum/go-ethereum/logger"
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"github.com/ethereum/go-ethereum/logger/glog"
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"github.com/rcrowley/go-metrics"
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)
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// MetricsEnabledFlag is the CLI flag name to use to enable metrics collections.
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var MetricsEnabledFlag = "metrics"
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// enabled is the flag specifying if metrics are enable or not.
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var enabled = false
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// Init enables or disables the metrics system. Since we need this to run before
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// any other code gets to create meters and timers, we'll actually do an ugly hack
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// and peek into the command line args for the metrics flag.
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func init() {
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for _, arg := range os.Args {
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if strings.TrimLeft(arg, "-") == MetricsEnabledFlag {
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glog.V(logger.Info).Infof("Enabling metrics collection")
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enabled = true
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}
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}
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}
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// NewMeter create a new metrics Meter, either a real one of a NOP stub depending
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// on the metrics flag.
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func NewMeter(name string) metrics.Meter {
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if !enabled {
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return new(metrics.NilMeter)
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}
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return metrics.GetOrRegisterMeter(name, metrics.DefaultRegistry)
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}
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// NewTimer create a new metrics Timer, either a real one of a NOP stub depending
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// on the metrics flag.
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func NewTimer(name string) metrics.Timer {
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if !enabled {
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return new(metrics.NilTimer)
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}
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return metrics.GetOrRegisterTimer(name, metrics.DefaultRegistry)
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}
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// CollectProcessMetrics periodically collects various metrics about the running
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// process.
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func CollectProcessMetrics(refresh time.Duration) {
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// Short circuit if the metrics system is disabled
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if !enabled {
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return
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}
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// Create the various data collectors
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memstats := make([]*runtime.MemStats, 2)
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diskstats := make([]*DiskStats, 2)
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for i := 0; i < len(memstats); i++ {
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memstats[i] = new(runtime.MemStats)
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diskstats[i] = new(DiskStats)
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}
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// Define the various metrics to collect
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memAllocs := metrics.GetOrRegisterMeter("system/memory/allocs", metrics.DefaultRegistry)
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memFrees := metrics.GetOrRegisterMeter("system/memory/frees", metrics.DefaultRegistry)
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memInuse := metrics.GetOrRegisterMeter("system/memory/inuse", metrics.DefaultRegistry)
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memPauses := metrics.GetOrRegisterMeter("system/memory/pauses", metrics.DefaultRegistry)
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var diskReads, diskReadBytes, diskWrites, diskWriteBytes metrics.Meter
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if err := ReadDiskStats(diskstats[0]); err == nil {
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diskReads = metrics.GetOrRegisterMeter("system/disk/readcount", metrics.DefaultRegistry)
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diskReadBytes = metrics.GetOrRegisterMeter("system/disk/readdata", metrics.DefaultRegistry)
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diskWrites = metrics.GetOrRegisterMeter("system/disk/writecount", metrics.DefaultRegistry)
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diskWriteBytes = metrics.GetOrRegisterMeter("system/disk/writedata", metrics.DefaultRegistry)
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} else {
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glog.V(logger.Debug).Infof("failed to read disk metrics: %v", err)
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}
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// Iterate loading the different stats and updating the meters
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for i := 1; ; i++ {
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runtime.ReadMemStats(memstats[i%2])
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memAllocs.Mark(int64(memstats[i%2].Mallocs - memstats[(i-1)%2].Mallocs))
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memFrees.Mark(int64(memstats[i%2].Frees - memstats[(i-1)%2].Frees))
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memInuse.Mark(int64(memstats[i%2].Alloc - memstats[(i-1)%2].Alloc))
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memPauses.Mark(int64(memstats[i%2].PauseTotalNs - memstats[(i-1)%2].PauseTotalNs))
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if ReadDiskStats(diskstats[i%2]) == nil {
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diskReads.Mark(int64(diskstats[i%2].ReadCount - diskstats[(i-1)%2].ReadCount))
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diskReadBytes.Mark(int64(diskstats[i%2].ReadBytes - diskstats[(i-1)%2].ReadBytes))
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diskWrites.Mark(int64(diskstats[i%2].WriteCount - diskstats[(i-1)%2].WriteCount))
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diskWriteBytes.Mark(int64(diskstats[i%2].WriteBytes - diskstats[(i-1)%2].WriteBytes))
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}
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time.Sleep(refresh)
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}
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}
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