forked from TrueCloudLab/distribution
78 lines
1.8 KiB
Go
78 lines
1.8 KiB
Go
package metrics
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import (
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"runtime"
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"testing"
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"time"
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)
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func BenchmarkRuntimeMemStats(b *testing.B) {
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r := NewRegistry()
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RegisterRuntimeMemStats(r)
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b.ResetTimer()
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for i := 0; i < b.N; i++ {
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CaptureRuntimeMemStatsOnce(r)
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}
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}
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func TestRuntimeMemStats(t *testing.T) {
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r := NewRegistry()
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RegisterRuntimeMemStats(r)
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CaptureRuntimeMemStatsOnce(r)
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zero := runtimeMetrics.MemStats.PauseNs.Count() // Get a "zero" since GC may have run before these tests.
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runtime.GC()
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CaptureRuntimeMemStatsOnce(r)
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if count := runtimeMetrics.MemStats.PauseNs.Count(); 1 != count-zero {
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t.Fatal(count - zero)
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}
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runtime.GC()
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runtime.GC()
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CaptureRuntimeMemStatsOnce(r)
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if count := runtimeMetrics.MemStats.PauseNs.Count(); 3 != count-zero {
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t.Fatal(count - zero)
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}
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for i := 0; i < 256; i++ {
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runtime.GC()
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}
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CaptureRuntimeMemStatsOnce(r)
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if count := runtimeMetrics.MemStats.PauseNs.Count(); 259 != count-zero {
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t.Fatal(count - zero)
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}
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for i := 0; i < 257; i++ {
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runtime.GC()
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}
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CaptureRuntimeMemStatsOnce(r)
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if count := runtimeMetrics.MemStats.PauseNs.Count(); 515 != count-zero { // We lost one because there were too many GCs between captures.
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t.Fatal(count - zero)
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}
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}
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func TestRuntimeMemStatsBlocking(t *testing.T) {
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if g := runtime.GOMAXPROCS(0); g < 2 {
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t.Skipf("skipping TestRuntimeMemStatsBlocking with GOMAXPROCS=%d\n", g)
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}
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ch := make(chan int)
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go testRuntimeMemStatsBlocking(ch)
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var memStats runtime.MemStats
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t0 := time.Now()
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runtime.ReadMemStats(&memStats)
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t1 := time.Now()
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t.Log("i++ during runtime.ReadMemStats:", <-ch)
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go testRuntimeMemStatsBlocking(ch)
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d := t1.Sub(t0)
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t.Log(d)
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time.Sleep(d)
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t.Log("i++ during time.Sleep:", <-ch)
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}
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func testRuntimeMemStatsBlocking(ch chan int) {
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i := 0
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for {
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select {
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case ch <- i:
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return
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default:
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i++
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}
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}
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}
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