103 lines
2.8 KiB
Go
103 lines
2.8 KiB
Go
// Copyright 2013 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package debug
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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 TestReadGCStats(t *testing.T) {
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defer SetGCPercent(SetGCPercent(-1))
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var stats GCStats
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var mstats runtime.MemStats
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var min, max time.Duration
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// First ReadGCStats will allocate, second should not,
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// especially if we follow up with an explicit garbage collection.
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stats.PauseQuantiles = make([]time.Duration, 10)
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ReadGCStats(&stats)
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runtime.GC()
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// Assume these will return same data: no GC during ReadGCStats.
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ReadGCStats(&stats)
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runtime.ReadMemStats(&mstats)
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if stats.NumGC != int64(mstats.NumGC) {
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t.Errorf("stats.NumGC = %d, but mstats.NumGC = %d", stats.NumGC, mstats.NumGC)
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}
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if stats.PauseTotal != time.Duration(mstats.PauseTotalNs) {
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t.Errorf("stats.PauseTotal = %d, but mstats.PauseTotalNs = %d", stats.PauseTotal, mstats.PauseTotalNs)
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}
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if stats.LastGC.UnixNano() != int64(mstats.LastGC) {
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t.Errorf("stats.LastGC.UnixNano = %d, but mstats.LastGC = %d", stats.LastGC.UnixNano(), mstats.LastGC)
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}
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n := int(mstats.NumGC)
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if n > len(mstats.PauseNs) {
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n = len(mstats.PauseNs)
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}
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if len(stats.Pause) != n {
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t.Errorf("len(stats.Pause) = %d, want %d", len(stats.Pause), n)
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} else {
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off := (int(mstats.NumGC) + len(mstats.PauseNs) - 1) % len(mstats.PauseNs)
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for i := 0; i < n; i++ {
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dt := stats.Pause[i]
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if dt != time.Duration(mstats.PauseNs[off]) {
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t.Errorf("stats.Pause[%d] = %d, want %d", i, dt, mstats.PauseNs[off])
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}
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if max < dt {
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max = dt
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}
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if min > dt || i == 0 {
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min = dt
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}
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off = (off + len(mstats.PauseNs) - 1) % len(mstats.PauseNs)
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}
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}
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q := stats.PauseQuantiles
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nq := len(q)
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if q[0] != min || q[nq-1] != max {
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t.Errorf("stats.PauseQuantiles = [%d, ..., %d], want [%d, ..., %d]", q[0], q[nq-1], min, max)
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}
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for i := 0; i < nq-1; i++ {
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if q[i] > q[i+1] {
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t.Errorf("stats.PauseQuantiles[%d]=%d > stats.PauseQuantiles[%d]=%d", i, q[i], i+1, q[i+1])
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}
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}
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}
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var big = make([]byte, 1<<20)
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func TestFreeOSMemory(t *testing.T) {
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var ms1, ms2 runtime.MemStats
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if big == nil {
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t.Skip("test is not reliable when run multiple times")
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}
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big = nil
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runtime.GC()
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runtime.ReadMemStats(&ms1)
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FreeOSMemory()
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runtime.ReadMemStats(&ms2)
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if ms1.HeapReleased >= ms2.HeapReleased {
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t.Errorf("released before=%d; released after=%d; did not go up", ms1.HeapReleased, ms2.HeapReleased)
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}
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}
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func TestSetGCPercent(t *testing.T) {
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// Test that the variable is being set and returned correctly.
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// Assume the percentage itself is implemented fine during GC,
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// which is harder to test.
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old := SetGCPercent(123)
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new := SetGCPercent(old)
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if new != 123 {
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t.Errorf("SetGCPercent(123); SetGCPercent(x) = %d, want 123", new)
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}
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}
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