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process_telemetry.go
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process_telemetry.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package telemetry
import (
"context"
"os"
"runtime"
"time"
"github.com/shirou/gopsutil/process"
"go.opencensus.io/stats"
"go.opencensus.io/stats/view"
)
// ProcessMetricsViews is a struct that contains views related to process metrics (cpu, mem, etc)
type ProcessMetricsViews struct {
prevTimeUnixNano int64
ballastSizeBytes uint64
views []*view.View
done chan struct{}
proc *process.Process
}
var mUptime = stats.Float64(
"process/uptime",
"Uptime of the process",
stats.UnitSeconds)
var viewProcessUptime = &view.View{
Name: mUptime.Name(),
Description: mUptime.Description(),
Measure: mUptime,
Aggregation: view.Sum(),
TagKeys: nil,
}
var mRuntimeAllocMem = stats.Int64(
"process/runtime/heap_alloc_bytes",
"Bytes of allocated heap objects (see 'go doc runtime.MemStats.HeapAlloc')",
stats.UnitBytes)
var viewAllocMem = &view.View{
Name: mRuntimeAllocMem.Name(),
Description: mRuntimeAllocMem.Description(),
Measure: mRuntimeAllocMem,
Aggregation: view.LastValue(),
TagKeys: nil,
}
var mRuntimeTotalAllocMem = stats.Int64(
"process/runtime/total_alloc_bytes",
"Cumulative bytes allocated for heap objects (see 'go doc runtime.MemStats.TotalAlloc')",
stats.UnitBytes)
var viewTotalAllocMem = &view.View{
Name: mRuntimeTotalAllocMem.Name(),
Description: mRuntimeTotalAllocMem.Description(),
Measure: mRuntimeTotalAllocMem,
Aggregation: view.LastValue(),
TagKeys: nil,
}
var mRuntimeSysMem = stats.Int64(
"process/runtime/total_sys_memory_bytes",
"Total bytes of memory obtained from the OS (see 'go doc runtime.MemStats.Sys')",
stats.UnitBytes)
var viewSysMem = &view.View{
Name: mRuntimeSysMem.Name(),
Description: mRuntimeSysMem.Description(),
Measure: mRuntimeSysMem,
Aggregation: view.LastValue(),
TagKeys: nil,
}
var mCPUSeconds = stats.Int64(
"process/cpu_seconds",
"Total CPU user and system time in seconds",
stats.UnitDimensionless)
var viewCPUSeconds = &view.View{
Name: mCPUSeconds.Name(),
Description: mCPUSeconds.Description(),
Measure: mCPUSeconds,
Aggregation: view.LastValue(),
TagKeys: nil,
}
var mRSSMemory = stats.Int64(
"process/memory/rss",
"Total physical memory (resident set size)",
stats.UnitDimensionless)
var viewRSSMemory = &view.View{
Name: mRSSMemory.Name(),
Description: mRSSMemory.Description(),
Measure: mRSSMemory,
Aggregation: view.LastValue(),
TagKeys: nil,
}
// NewProcessMetricsViews creates a new set of ProcessMetrics (mem, cpu) that can be used to measure
// basic information about this process.
func NewProcessMetricsViews(ballastSizeBytes uint64) (*ProcessMetricsViews, error) {
pmv := &ProcessMetricsViews{
prevTimeUnixNano: time.Now().UnixNano(),
ballastSizeBytes: ballastSizeBytes,
views: []*view.View{viewProcessUptime, viewAllocMem, viewTotalAllocMem, viewSysMem, viewCPUSeconds, viewRSSMemory},
done: make(chan struct{}),
}
pid := os.Getpid()
var err error
pmv.proc, err = process.NewProcess(int32(pid))
if err != nil {
return nil, err
}
return pmv, nil
}
// StartCollection starts a ticker'd goroutine that will update the PMV measurements every 5 seconds
func (pmv *ProcessMetricsViews) StartCollection() {
go func() {
ticker := time.NewTicker(5 * time.Second)
defer ticker.Stop()
for {
select {
case <-ticker.C:
pmv.updateViews()
case <-pmv.done:
return
}
}
}()
}
// Views returns the views internal to the PMV.
func (pmv *ProcessMetricsViews) Views() []*view.View {
return pmv.views
}
// StopCollection stops the collection of the process metric information.
func (pmv *ProcessMetricsViews) StopCollection() {
close(pmv.done)
}
func (pmv *ProcessMetricsViews) updateViews() {
now := time.Now().UnixNano()
stats.Record(context.Background(), mUptime.M(float64(now-pmv.prevTimeUnixNano)/1e9))
pmv.prevTimeUnixNano = now
ms := &runtime.MemStats{}
pmv.readMemStats(ms)
stats.Record(context.Background(), mRuntimeAllocMem.M(int64(ms.Alloc)))
stats.Record(context.Background(), mRuntimeTotalAllocMem.M(int64(ms.TotalAlloc)))
stats.Record(context.Background(), mRuntimeSysMem.M(int64(ms.Sys)))
if pmv.proc != nil {
if times, err := pmv.proc.Times(); err == nil {
stats.Record(context.Background(), mCPUSeconds.M(int64(times.Total())))
}
if mem, err := pmv.proc.MemoryInfo(); err == nil {
stats.Record(context.Background(), mRSSMemory.M(int64(mem.RSS)))
}
}
}
func (pmv *ProcessMetricsViews) readMemStats(ms *runtime.MemStats) {
runtime.ReadMemStats(ms)
ms.Alloc -= pmv.ballastSizeBytes
ms.HeapAlloc -= pmv.ballastSizeBytes
ms.HeapSys -= pmv.ballastSizeBytes
ms.HeapInuse -= pmv.ballastSizeBytes
}