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// Copyright 2013 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 (
"flag"
. "runtime"
"testing"
"time"
"unsafe"
)
func TestMemStats(t *testing.T) {
// Test that MemStats has sane values.
st := new(MemStats)
ReadMemStats(st)
// Everything except HeapReleased and HeapIdle, because they indeed can be 0.
if st.Alloc == 0 || st.TotalAlloc == 0 || st.Sys == 0 || st.Lookups == 0 ||
st.Mallocs == 0 || st.Frees == 0 || st.HeapAlloc == 0 || st.HeapSys == 0 ||
st.HeapInuse == 0 || st.HeapObjects == 0 || st.StackInuse == 0 ||
st.StackSys == 0 || st.MSpanInuse == 0 || st.MSpanSys == 0 || st.MCacheInuse == 0 ||
st.MCacheSys == 0 || st.BuckHashSys == 0 || st.GCSys == 0 || st.OtherSys == 0 ||
st.NextGC == 0 || st.NumGC == 0 {
t.Fatalf("Zero value: %+v", *st)
}
if st.Alloc > 1e10 || st.TotalAlloc > 1e11 || st.Sys > 1e10 || st.Lookups > 1e10 ||
st.Mallocs > 1e10 || st.Frees > 1e10 || st.HeapAlloc > 1e10 || st.HeapSys > 1e10 ||
st.HeapIdle > 1e10 || st.HeapInuse > 1e10 || st.HeapObjects > 1e10 || st.StackInuse > 1e10 ||
st.StackSys > 1e10 || st.MSpanInuse > 1e10 || st.MSpanSys > 1e10 || st.MCacheInuse > 1e10 ||
st.MCacheSys > 1e10 || st.BuckHashSys > 1e10 || st.GCSys > 1e10 || st.OtherSys > 1e10 ||
st.NextGC > 1e10 || st.NumGC > 1e9 {
t.Fatalf("Insanely high value (overflow?): %+v", *st)
}
if st.Sys != st.HeapSys+st.StackSys+st.MSpanSys+st.MCacheSys+
st.BuckHashSys+st.GCSys+st.OtherSys {
t.Fatalf("Bad sys value: %+v", *st)
}
if st.HeapIdle+st.HeapInuse != st.HeapSys {
t.Fatalf("HeapIdle(%d) + HeapInuse(%d) should be equal to HeapSys(%d), but isn't.", st.HeapIdle, st.HeapInuse, st.HeapSys)
}
}
var mallocSink uintptr
func BenchmarkMalloc8(b *testing.B) {
var x uintptr
for i := 0; i < b.N; i++ {
p := new(int64)
x ^= uintptr(unsafe.Pointer(p))
}
mallocSink = x
}
func BenchmarkMalloc16(b *testing.B) {
var x uintptr
for i := 0; i < b.N; i++ {
p := new([2]int64)
x ^= uintptr(unsafe.Pointer(p))
}
mallocSink = x
}
func BenchmarkMallocTypeInfo8(b *testing.B) {
var x uintptr
for i := 0; i < b.N; i++ {
p := new(struct {
p [8 / unsafe.Sizeof(uintptr(0))]*int
})
x ^= uintptr(unsafe.Pointer(p))
}
mallocSink = x
}
func BenchmarkMallocTypeInfo16(b *testing.B) {
var x uintptr
for i := 0; i < b.N; i++ {
p := new(struct {
p [16 / unsafe.Sizeof(uintptr(0))]*int
})
x ^= uintptr(unsafe.Pointer(p))
}
mallocSink = x
}
type LargeStruct struct {
x [16][]byte
}
func BenchmarkMallocLargeStruct(b *testing.B) {
var x uintptr
for i := 0; i < b.N; i++ {
p := make([]LargeStruct, 2)
x ^= uintptr(unsafe.Pointer(&p[0]))
}
mallocSink = x
}
var n = flag.Int("n", 1000, "number of goroutines")
func BenchmarkGoroutineSelect(b *testing.B) {
quit := make(chan struct{})
read := func(ch chan struct{}) {
for {
select {
case _, ok := <-ch:
if !ok {
return
}
case <-quit:
return
}
}
}
benchHelper(b, *n, read)
}
func BenchmarkGoroutineBlocking(b *testing.B) {
read := func(ch chan struct{}) {
for {
if _, ok := <-ch; !ok {
return
}
}
}
benchHelper(b, *n, read)
}
func BenchmarkGoroutineForRange(b *testing.B) {
read := func(ch chan struct{}) {
for range ch {
}
}
benchHelper(b, *n, read)
}
func benchHelper(b *testing.B, n int, read func(chan struct{})) {
m := make([]chan struct{}, n)
for i := range m {
m[i] = make(chan struct{}, 1)
go read(m[i])
}
b.StopTimer()
b.ResetTimer()
GC()
for i := 0; i < b.N; i++ {
for _, ch := range m {
if ch != nil {
ch <- struct{}{}
}
}
time.Sleep(10 * time.Millisecond)
b.StartTimer()
GC()
b.StopTimer()
}
for _, ch := range m {
close(ch)
}
time.Sleep(10 * time.Millisecond)
}
func BenchmarkGoroutineIdle(b *testing.B) {
quit := make(chan struct{})
fn := func() {
<-quit
}
for i := 0; i < *n; i++ {
go fn()
}
GC()
b.ResetTimer()
for i := 0; i < b.N; i++ {
GC()
}
b.StopTimer()
close(quit)
time.Sleep(10 * time.Millisecond)
}
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