/
metrics_test.go
363 lines (325 loc) · 9.96 KB
/
metrics_test.go
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// Copyright 2014 The Cockroach 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. See the AUTHORS file
// for names of contributors.
//
// Author: Tyler Neely (t@jujit.su)
package loghisto
import (
"fmt"
"math"
"runtime"
"testing"
"time"
)
func ExampleMetricSystem() {
ms := NewMetricSystem(time.Microsecond, true)
ms.Start()
myMetricStream := make(chan *ProcessedMetricSet, 2)
ms.SubscribeToProcessedMetrics(myMetricStream)
timeToken := ms.StartTimer("submit_metrics")
ms.Counter("range_splits", 1)
ms.Histogram("some_ipc_latency", 123)
timeToken.Stop()
processedMetricSet := <-myMetricStream
ms.UnsubscribeFromProcessedMetrics(myMetricStream)
m := processedMetricSet.Metrics
example := []struct {
Name string
Value float64
}{
{
"total range splits during the process lifetime",
m["range_splits"],
}, {
"range splits in this period",
m["range_splits_rate"],
}, {
"some_ipc 99.9th percentile",
m["some_ipc_latency_99.9"],
}, {
"some_ipc max",
m["some_ipc_latency_max"],
}, {
"some_ipc calls this period",
m["some_ipc_latency_count"],
}, {
"some_ipc calls during the process lifetime",
m["some_ipc_latency_agg_count"],
}, {
"some_ipc total latency this period",
m["some_ipc_latency_sum"],
}, {
"some_ipc mean this period",
m["some_ipc_latency_avg"],
}, {
"some_ipc aggregate man",
m["some_ipc_latency_agg_avg"],
}, {
"time spent submitting metrics this period",
m["submit_metrics_sum"],
}, {
"number of goroutines",
m["sys.NumGoroutine"],
}, {
"time spent in GC",
m["sys.PauseTotalNs"],
},
}
for _, nameValue := range example {
var result string
if nameValue.Value == float64(0) {
result = "NOT present"
} else {
result = "present"
}
fmt.Println(nameValue.Name, result)
}
ms.Stop()
// Output:
// total range splits during the process lifetime present
// range splits in this period present
// some_ipc 99.9th percentile present
// some_ipc max present
// some_ipc calls this period present
// some_ipc calls during the process lifetime present
// some_ipc total latency this period present
// some_ipc mean this period present
// some_ipc aggregate man present
// time spent submitting metrics this period present
// number of goroutines present
// time spent in GC present
}
func TestPercentile(t *testing.T) {
metrics := map[float64]uint64{
10: 9000,
25: 900,
33: 90,
47: 9,
500: 1,
}
percentileToExpected := map[float64]float64{
0: 10,
.99: 25,
.999: 33,
.9991: 47,
.9999: 47,
1: 500,
}
totalcount := uint64(0)
proportions := make([]proportion, 0, len(metrics))
for value, count := range metrics {
totalcount += count
proportions = append(proportions, proportion{Value: value, Count: count})
}
for p, expected := range percentileToExpected {
result, err := percentile(totalcount, proportions, p)
if err != nil {
t.Error("error:", err)
}
// results must be within 1% of their expected values.
diff := math.Abs(expected/result - 1)
if diff > .01 {
t.Errorf("percentile: %.04f, expected: %.04f, actual: %.04f, %% off: %.04f\n",
p, expected, result, diff*100)
}
}
}
func TestCompress(t *testing.T) {
toTest := []float64{
-421408208120481,
-1,
0,
1,
214141241241241,
}
for _, f := range toTest {
result := decompress(compress(f))
var diff float64
if result == 0 {
diff = math.Abs(f - result)
} else {
diff = math.Abs(f/result - 1)
}
if diff > .01 {
t.Errorf("expected: %f, actual: %f, %% off: %.04f\n",
f, result, diff*100)
}
}
}
func TestSysStats(t *testing.T) {
metricSystem := NewMetricSystem(time.Microsecond, true)
gauges := metricSystem.collectRawMetrics().Gauges
v, present := gauges["sys.Alloc"]
if v <= 0 || !present {
t.Errorf("expected positive reported allocated bytes, got %f\n", v)
}
}
func TestTimer(t *testing.T) {
metricSystem := NewMetricSystem(time.Microsecond, false)
token1 := metricSystem.StartTimer("timer1")
token2 := metricSystem.StartTimer("timer1")
time.Sleep(50 & time.Microsecond)
token1.Stop()
time.Sleep(5 * time.Microsecond)
token2.Stop()
token3 := metricSystem.StartTimer("timer1")
time.Sleep(10 * time.Microsecond)
token3.Stop()
result := metricSystem.processMetrics(metricSystem.collectRawMetrics()).Metrics
if result["timer1_min"] > result["timer1_50"] ||
result["timer1_50"] > result["timer1_max"] {
t.Error("bad result map:", result)
}
}
func TestRate(t *testing.T) {
metricSystem := NewMetricSystem(time.Microsecond, false)
metricSystem.Counter("rate1", 777)
time.Sleep(20 * time.Millisecond)
metrics := metricSystem.processMetrics(metricSystem.collectRawMetrics()).Metrics
if metrics["rate1_rate"] != 777 {
t.Error("count one value")
}
metricSystem.Counter("rate1", 1223)
time.Sleep(20 * time.Millisecond)
metrics = metricSystem.processMetrics(metricSystem.collectRawMetrics()).Metrics
if metrics["rate1_rate"] != 1223 {
t.Errorf("expected rate: 1223, actual: %f", metrics["rate1_rate"])
}
metricSystem.Counter("rate1", 1223)
metricSystem.Counter("rate1", 1223)
time.Sleep(20 * time.Millisecond)
metrics = metricSystem.processMetrics(metricSystem.collectRawMetrics()).Metrics
if metrics["rate1_rate"] != 2446 {
t.Errorf("expected rate: 2446, actual: %f", metrics["rate1_rate"])
}
}
func TestCounter(t *testing.T) {
metricSystem := NewMetricSystem(time.Microsecond, false)
metricSystem.Counter("counter1", 3290)
time.Sleep(20 * time.Millisecond)
metrics := metricSystem.processMetrics(metricSystem.collectRawMetrics()).Metrics
if metrics["counter1"] != 3290 {
t.Error("count one value", metrics)
}
metricSystem.Counter("counter1", 10000)
time.Sleep(20 * time.Millisecond)
metrics = metricSystem.processMetrics(metricSystem.collectRawMetrics()).Metrics
if metrics["counter1"] != 13290 {
t.Error("accumulate counts across broadcasts")
}
}
func TestUpdateSubscribers(t *testing.T) {
rawMetricStream := make(chan *RawMetricSet)
processedMetricStream := make(chan *ProcessedMetricSet)
metricSystem := NewMetricSystem(2*time.Microsecond, false)
metricSystem.SubscribeToRawMetrics(rawMetricStream)
metricSystem.SubscribeToProcessedMetrics(processedMetricStream)
metricSystem.Counter("counter5", 33)
go func() {
select {
case <-rawMetricStream:
case <-time.After(20 * time.Millisecond):
t.Error("received no raw metrics from the MetricSystem after 2 milliseconds.")
}
metricSystem.UnsubscribeFromRawMetrics(rawMetricStream)
}()
go func() {
select {
case <-processedMetricStream:
case <-time.After(20 * time.Millisecond):
t.Error("received no processed metrics from the MetricSystem after 2 milliseconds.")
}
metricSystem.UnsubscribeFromProcessedMetrics(processedMetricStream)
}()
metricSystem.Start()
time.Sleep(20 * time.Millisecond)
go func() {
select {
case <-rawMetricStream:
t.Error("received raw metrics from the MetricSystem after unsubscribing.")
default:
}
}()
go func() {
select {
case <-processedMetricStream:
t.Error("received processed metrics from the MetricSystem after unsubscribing.")
default:
}
}()
time.Sleep(20 * time.Millisecond)
}
func TestProcessedBroadcast(t *testing.T) {
processedMetricStream := make(chan *ProcessedMetricSet, 128)
metricSystem := NewMetricSystem(time.Microsecond, false)
metricSystem.SubscribeToProcessedMetrics(processedMetricStream)
metricSystem.Histogram("histogram1", 33)
metricSystem.Histogram("histogram1", 59)
metricSystem.Histogram("histogram1", 330000)
metricSystem.Start()
select {
case processedMetrics := <-processedMetricStream:
if int(processedMetrics.Metrics["histogram1_sum"]) != 331132 {
t.Error("expected histogram1_sum to be 331132, instead was",
processedMetrics.Metrics["histogram1_sum"])
}
if int(processedMetrics.Metrics["histogram1_agg_avg"]) != 110377 {
t.Error("expected histogram1_agg_avg to be 110377, instead was",
processedMetrics.Metrics["histogram1_agg_avg"])
}
if int(processedMetrics.Metrics["histogram1_count"]) != 3 {
t.Error("expected histogram1_count to be 3, instead was",
processedMetrics.Metrics["histogram1_count"])
}
case <-time.After(20 * time.Millisecond):
t.Error("received no metrics from the MetricSystem after 2 milliseconds.")
}
metricSystem.UnsubscribeFromProcessedMetrics(processedMetricStream)
metricSystem.Stop()
}
func TestRawBroadcast(t *testing.T) {
rawMetricStream := make(chan *RawMetricSet, 128)
metricSystem := NewMetricSystem(time.Microsecond, false)
metricSystem.SubscribeToRawMetrics(rawMetricStream)
metricSystem.Counter("counter2", 10)
metricSystem.Counter("counter2", 111)
metricSystem.Start()
select {
case rawMetrics := <-rawMetricStream:
if rawMetrics.Counters["counter2"] != 121 {
t.Error("expected counter2 to be 121, instead was",
rawMetrics.Counters["counter2"])
}
if rawMetrics.Rates["counter2"] != 121 {
t.Error("expected counter2 rate to be 121, instead was",
rawMetrics.Counters["counter2"])
}
case <-time.After(20 * time.Millisecond):
t.Error("received no metrics from the MetricSystem after 2 milliseconds.")
}
metricSystem.UnsubscribeFromRawMetrics(rawMetricStream)
metricSystem.Stop()
}
func TestMetricSystemStop(t *testing.T) {
metricSystem := NewMetricSystem(time.Microsecond, false)
startingRoutines := runtime.NumGoroutine()
metricSystem.Start()
metricSystem.Stop()
time.Sleep(20 * time.Millisecond)
endRoutines := runtime.NumGoroutine()
if startingRoutines < endRoutines {
t.Errorf("lingering goroutines have not been cleaned up: "+
"before: %d, after: %d\n", startingRoutines, endRoutines)
}
}