| // 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) | |
| } |