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// Copyright 2015 The go-ethereum Authors
// This file is part of go-ethereum.
//
// go-ethereum is free software: you can redistribute it and/or modify
// it under the terms of the GNU Lesser General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// go-ethereum is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public License
// along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
// Package metrics provides general system and process level metrics collection.
package metrics
import (
"os"
"runtime"
"strings"
"time"
"github.com/ethereum/go-ethereum/logger"
"github.com/ethereum/go-ethereum/logger/glog"
"github.com/rcrowley/go-metrics"
)
// MetricsEnabledFlag is the CLI flag name to use to enable metrics collections.
var MetricsEnabledFlag = "metrics"
// enabled is the flag specifying if metrics are enable or not.
var enabled = false
// Init enables or disables the metrics system. Since we need this to run before
// any other code gets to create meters and timers, we'll actually do an ugly hack
// and peek into the command line args for the metrics flag.
func init() {
for _, arg := range os.Args {
if strings.TrimLeft(arg, "-") == MetricsEnabledFlag {
glog.V(logger.Info).Infof("Enabling metrics collection")
enabled = true
}
}
}
// NewMeter create a new metrics Meter, either a real one of a NOP stub depending
// on the metrics flag.
func NewMeter(name string) metrics.Meter {
if !enabled {
return new(metrics.NilMeter)
}
return metrics.GetOrRegisterMeter(name, metrics.DefaultRegistry)
}
// NewTimer create a new metrics Timer, either a real one of a NOP stub depending
// on the metrics flag.
func NewTimer(name string) metrics.Timer {
if !enabled {
return new(metrics.NilTimer)
}
return metrics.GetOrRegisterTimer(name, metrics.DefaultRegistry)
}
// CollectProcessMetrics periodically collects various metrics about the running
// process.
func CollectProcessMetrics(refresh time.Duration) {
// Short circuit if the metrics system is disabled
if !enabled {
return
}
// Create the various data collectors
memstats := make([]*runtime.MemStats, 2)
diskstats := make([]*DiskStats, 2)
for i := 0; i < len(memstats); i++ {
memstats[i] = new(runtime.MemStats)
diskstats[i] = new(DiskStats)
}
// Define the various metrics to collect
memAllocs := metrics.GetOrRegisterMeter("system/memory/allocs", metrics.DefaultRegistry)
memFrees := metrics.GetOrRegisterMeter("system/memory/frees", metrics.DefaultRegistry)
memInuse := metrics.GetOrRegisterMeter("system/memory/inuse", metrics.DefaultRegistry)
memPauses := metrics.GetOrRegisterMeter("system/memory/pauses", metrics.DefaultRegistry)
var diskReads, diskReadBytes, diskWrites, diskWriteBytes metrics.Meter
if err := ReadDiskStats(diskstats[0]); err == nil {
diskReads = metrics.GetOrRegisterMeter("system/disk/readcount", metrics.DefaultRegistry)
diskReadBytes = metrics.GetOrRegisterMeter("system/disk/readdata", metrics.DefaultRegistry)
diskWrites = metrics.GetOrRegisterMeter("system/disk/writecount", metrics.DefaultRegistry)
diskWriteBytes = metrics.GetOrRegisterMeter("system/disk/writedata", metrics.DefaultRegistry)
} else {
glog.V(logger.Debug).Infof("failed to read disk metrics: %v", err)
}
// Iterate loading the different stats and updating the meters
for i := 1; ; i++ {
runtime.ReadMemStats(memstats[i%2])
memAllocs.Mark(int64(memstats[i%2].Mallocs - memstats[(i-1)%2].Mallocs))
memFrees.Mark(int64(memstats[i%2].Frees - memstats[(i-1)%2].Frees))
memInuse.Mark(int64(memstats[i%2].Alloc - memstats[(i-1)%2].Alloc))
memPauses.Mark(int64(memstats[i%2].PauseTotalNs - memstats[(i-1)%2].PauseTotalNs))
if ReadDiskStats(diskstats[i%2]) == nil {
diskReads.Mark(int64(diskstats[i%2].ReadCount - diskstats[(i-1)%2].ReadCount))
diskReadBytes.Mark(int64(diskstats[i%2].ReadBytes - diskstats[(i-1)%2].ReadBytes))
diskWrites.Mark(int64(diskstats[i%2].WriteCount - diskstats[(i-1)%2].WriteCount))
diskWriteBytes.Mark(int64(diskstats[i%2].WriteBytes - diskstats[(i-1)%2].WriteBytes))
}
time.Sleep(refresh)
}
}
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