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// Copyright 2011 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package runtime_test
import (
"runtime"
"testing"
)
func TestGcSys(t *testing.T) {
memstats := new(runtime.MemStats)
runtime.GC()
runtime.ReadMemStats(memstats)
sys := memstats.Sys
itercount := 1000000
if testing.Short() {
itercount = 100000
}
for i := 0; i < itercount; i++ {
workthegc()
}
// Should only be using a few MB.
runtime.ReadMemStats(memstats)
if sys > memstats.Sys {
sys = 0
} else {
sys = memstats.Sys - sys
}
t.Logf("used %d extra bytes", sys)
if sys > 4<<20 {
t.Fatalf("using too much memory: %d bytes", sys)
}
}
func workthegc() []byte {
return make([]byte, 1029)
}
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