package runtime_test | |
import ( | |
"runtime" | |
"testing" | |
) | |
func TestGcSys(t *testing.T) { | |
runtime.GC() | |
runtime.UpdateMemStats() | |
sys := runtime.MemStats.Sys | |
for i := 0; i < 1000000; i++ { | |
workthegc() | |
} | |
// Should only be using a few MB. | |
runtime.UpdateMemStats() | |
if sys > runtime.MemStats.Sys { | |
sys = 0 | |
} else { | |
sys = runtime.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) | |
} |