61 lines
1.2 KiB
Go
61 lines
1.2 KiB
Go
// Copyright 2011 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 runtime_test
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import (
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"runtime"
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"testing"
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)
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func TestGcSys(t *testing.T) {
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memstats := new(runtime.MemStats)
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runtime.GC()
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runtime.ReadMemStats(memstats)
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sys := memstats.Sys
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runtime.MemProfileRate = 0 // disable profiler
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itercount := 1000000
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if testing.Short() {
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itercount = 100000
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}
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for i := 0; i < itercount; i++ {
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workthegc()
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}
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// Should only be using a few MB.
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// We allocated 100 MB or (if not short) 1 GB.
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runtime.ReadMemStats(memstats)
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if sys > memstats.Sys {
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sys = 0
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} else {
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sys = memstats.Sys - sys
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}
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t.Logf("used %d extra bytes", sys)
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if sys > 16<<20 {
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t.Fatalf("using too much memory: %d bytes", sys)
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}
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}
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func workthegc() []byte {
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return make([]byte, 1029)
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}
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func TestGcDeepNesting(t *testing.T) {
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type T [2][2][2][2][2][2][2][2][2][2]*int
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a := new(T)
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// Prevent the compiler from applying escape analysis.
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// This makes sure new(T) is allocated on heap, not on the stack.
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t.Logf("%p", a)
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a[0][0][0][0][0][0][0][0][0][0] = new(int)
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*a[0][0][0][0][0][0][0][0][0][0] = 13
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runtime.GC()
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if *a[0][0][0][0][0][0][0][0][0][0] != 13 {
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t.Fail()
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}
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}
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