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// Copyright 2018 The Prometheus 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
//
// http://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 prometheus
import (
"runtime"
"testing"
"time"
dto "github.com/prometheus/client_model/go"
)
func TestGoCollectorGoroutines(t *testing.T) {
var (
c = NewGoCollector()
metricCh = make(chan Metric)
waitCh = make(chan struct{})
endGoroutineCh = make(chan struct{})
endCollectionCh = make(chan struct{})
old = -1
)
defer func() {
close(endGoroutineCh)
// Drain the collect channel to prevent goroutine leak.
for {
select {
case <-metricCh:
case <-endCollectionCh:
return
}
}
}()
go func() {
c.Collect(metricCh)
for i := 1; i <= 10; i++ {
// Start 10 goroutines to be sure we'll detect an
// increase even if unrelated goroutines happen to
// terminate during this test.
go func(c <-chan struct{}) {
<-c
}(endGoroutineCh)
}
<-waitCh
c.Collect(metricCh)
close(endCollectionCh)
}()
for {
select {
case m := <-metricCh:
// m can be Gauge or Counter,
// currently just test the go_goroutines Gauge
// and ignore others.
if m.Desc().fqName != "go_goroutines" {
continue
}
pb := &dto.Metric{}
m.Write(pb)
if pb.GetGauge() == nil {
continue
}
if old == -1 {
old = int(pb.GetGauge().GetValue())
close(waitCh)
continue
}
if diff := old - int(pb.GetGauge().GetValue()); diff > -1 {
t.Errorf("want at least one new goroutine, got %d fewer", diff)
}
case <-time.After(1 * time.Second):
t.Fatalf("expected collect timed out")
}
break
}
}
func TestGoCollectorGC(t *testing.T) {
var (
c = NewGoCollector()
metricCh = make(chan Metric)
waitCh = make(chan struct{})
endCollectionCh = make(chan struct{})
oldGC uint64
oldPause float64
)
go func() {
c.Collect(metricCh)
// force GC
runtime.GC()
<-waitCh
c.Collect(metricCh)
close(endCollectionCh)
}()
defer func() {
// Drain the collect channel to prevent goroutine leak.
for {
select {
case <-metricCh:
case <-endCollectionCh:
return
}
}
}()
first := true
for {
select {
case metric := <-metricCh:
pb := &dto.Metric{}
metric.Write(pb)
if pb.GetSummary() == nil {
continue
}
if len(pb.GetSummary().Quantile) != 5 {
t.Errorf("expected 4 buckets, got %d", len(pb.GetSummary().Quantile))
}
for idx, want := range []float64{0.0, 0.25, 0.5, 0.75, 1.0} {
if *pb.GetSummary().Quantile[idx].Quantile != want {
t.Errorf("bucket #%d is off, got %f, want %f", idx, *pb.GetSummary().Quantile[idx].Quantile, want)
}
}
if first {
first = false
oldGC = *pb.GetSummary().SampleCount
oldPause = *pb.GetSummary().SampleSum
close(waitCh)
continue
}
if diff := *pb.GetSummary().SampleCount - oldGC; diff < 1 {
t.Errorf("want at least 1 new garbage collection run, got %d", diff)
}
if diff := *pb.GetSummary().SampleSum - oldPause; diff <= 0 {
t.Errorf("want an increase in pause time, got a change of %f", diff)
}
case <-time.After(1 * time.Second):
t.Fatalf("expected collect timed out")
}
break
}
}
func BenchmarkGoCollector(b *testing.B) {
c := NewGoCollector().(*goCollector)
b.ResetTimer()
for i := 0; i < b.N; i++ {
ch := make(chan Metric, 8)
go func() {
// Drain all metrics received until the
// channel is closed.
for range ch {
}
}()
c.Collect(ch)
close(ch)
}
}
|
