• Anton Evangelatov's avatar
    metrics: pull library and introduce ResettingTimer and InfluxDB reporter (#15910) · ae9f9722
    Anton Evangelatov authored
    * go-metrics: fork library and introduce ResettingTimer and InfluxDB reporter.
    
    * vendor: change nonsense/go-metrics to ethersphere/go-metrics
    
    * go-metrics: add tests. move ResettingTimer logic from reporter to type.
    
    * all, metrics: pull in metrics package in go-ethereum
    
    * metrics/test: make sure metrics are enabled for tests
    
    * metrics: apply gosimple rules
    
    * metrics/exp, internal/debug: init expvar endpoint when starting pprof server
    
    * internal/debug: tiny comment formatting fix
    ae9f9722
runtime_test.go 2.01 KB
package metrics

import (
	"runtime"
	"testing"
	"time"
)

func BenchmarkRuntimeMemStats(b *testing.B) {
	r := NewRegistry()
	RegisterRuntimeMemStats(r)
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		CaptureRuntimeMemStatsOnce(r)
	}
}

func TestRuntimeMemStats(t *testing.T) {
	r := NewRegistry()
	RegisterRuntimeMemStats(r)
	CaptureRuntimeMemStatsOnce(r)
	zero := runtimeMetrics.MemStats.PauseNs.Count() // Get a "zero" since GC may have run before these tests.
	runtime.GC()
	CaptureRuntimeMemStatsOnce(r)
	if count := runtimeMetrics.MemStats.PauseNs.Count(); 1 != count-zero {
		t.Fatal(count - zero)
	}
	runtime.GC()
	runtime.GC()
	CaptureRuntimeMemStatsOnce(r)
	if count := runtimeMetrics.MemStats.PauseNs.Count(); 3 != count-zero {
		t.Fatal(count - zero)
	}
	for i := 0; i < 256; i++ {
		runtime.GC()
	}
	CaptureRuntimeMemStatsOnce(r)
	if count := runtimeMetrics.MemStats.PauseNs.Count(); 259 != count-zero {
		t.Fatal(count - zero)
	}
	for i := 0; i < 257; i++ {
		runtime.GC()
	}
	CaptureRuntimeMemStatsOnce(r)
	if count := runtimeMetrics.MemStats.PauseNs.Count(); 515 != count-zero { // We lost one because there were too many GCs between captures.
		t.Fatal(count - zero)
	}
}

func TestRuntimeMemStatsNumThread(t *testing.T) {
	r := NewRegistry()
	RegisterRuntimeMemStats(r)
	CaptureRuntimeMemStatsOnce(r)

	if value := runtimeMetrics.NumThread.Value(); value < 1 {
		t.Fatalf("got NumThread: %d, wanted at least 1", value)
	}
}

func TestRuntimeMemStatsBlocking(t *testing.T) {
	if g := runtime.GOMAXPROCS(0); g < 2 {
		t.Skipf("skipping TestRuntimeMemStatsBlocking with GOMAXPROCS=%d\n", g)
	}
	ch := make(chan int)
	go testRuntimeMemStatsBlocking(ch)
	var memStats runtime.MemStats
	t0 := time.Now()
	runtime.ReadMemStats(&memStats)
	t1 := time.Now()
	t.Log("i++ during runtime.ReadMemStats:", <-ch)
	go testRuntimeMemStatsBlocking(ch)
	d := t1.Sub(t0)
	t.Log(d)
	time.Sleep(d)
	t.Log("i++ during time.Sleep:", <-ch)
}

func testRuntimeMemStatsBlocking(ch chan int) {
	i := 0
	for {
		select {
		case ch <- i:
			return
		default:
			i++
		}
	}
}