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path: root/src/pkg/runtime/gc_test.go
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Diffstat (limited to 'src/pkg/runtime/gc_test.go')
-rw-r--r--src/pkg/runtime/gc_test.go236
1 files changed, 0 insertions, 236 deletions
diff --git a/src/pkg/runtime/gc_test.go b/src/pkg/runtime/gc_test.go
deleted file mode 100644
index 58717ecf7..000000000
--- a/src/pkg/runtime/gc_test.go
+++ /dev/null
@@ -1,236 +0,0 @@
-// 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 (
- "os"
- "runtime"
- "runtime/debug"
- "testing"
- "time"
-)
-
-func TestGcSys(t *testing.T) {
- if os.Getenv("GOGC") == "off" {
- t.Skip("skipping test; GOGC=off in environment")
- }
- data := struct{ Short bool }{testing.Short()}
- got := executeTest(t, testGCSysSource, &data)
- want := "OK\n"
- if got != want {
- t.Fatalf("expected %q, but got %q", want, got)
- }
-}
-
-const testGCSysSource = `
-package main
-
-import (
- "fmt"
- "runtime"
-)
-
-func main() {
- runtime.GOMAXPROCS(1)
- memstats := new(runtime.MemStats)
- runtime.GC()
- runtime.ReadMemStats(memstats)
- sys := memstats.Sys
-
- runtime.MemProfileRate = 0 // disable profiler
-
- itercount := 1000000
-{{if .Short}}
- itercount = 100000
-{{end}}
- for i := 0; i < itercount; i++ {
- workthegc()
- }
-
- // Should only be using a few MB.
- // We allocated 100 MB or (if not short) 1 GB.
- runtime.ReadMemStats(memstats)
- if sys > memstats.Sys {
- sys = 0
- } else {
- sys = memstats.Sys - sys
- }
- if sys > 16<<20 {
- fmt.Printf("using too much memory: %d bytes\n", sys)
- return
- }
- fmt.Printf("OK\n")
-}
-
-func workthegc() []byte {
- return make([]byte, 1029)
-}
-`
-
-func TestGcDeepNesting(t *testing.T) {
- type T [2][2][2][2][2][2][2][2][2][2]*int
- a := new(T)
-
- // Prevent the compiler from applying escape analysis.
- // This makes sure new(T) is allocated on heap, not on the stack.
- t.Logf("%p", a)
-
- a[0][0][0][0][0][0][0][0][0][0] = new(int)
- *a[0][0][0][0][0][0][0][0][0][0] = 13
- runtime.GC()
- if *a[0][0][0][0][0][0][0][0][0][0] != 13 {
- t.Fail()
- }
-}
-
-func TestGcHashmapIndirection(t *testing.T) {
- defer debug.SetGCPercent(debug.SetGCPercent(1))
- runtime.GC()
- type T struct {
- a [256]int
- }
- m := make(map[T]T)
- for i := 0; i < 2000; i++ {
- var a T
- a.a[0] = i
- m[a] = T{}
- }
-}
-
-func TestGcArraySlice(t *testing.T) {
- type X struct {
- buf [1]byte
- nextbuf []byte
- next *X
- }
- var head *X
- for i := 0; i < 10; i++ {
- p := &X{}
- p.buf[0] = 42
- p.next = head
- if head != nil {
- p.nextbuf = head.buf[:]
- }
- head = p
- runtime.GC()
- }
- for p := head; p != nil; p = p.next {
- if p.buf[0] != 42 {
- t.Fatal("corrupted heap")
- }
- }
-}
-
-func TestGcRescan(t *testing.T) {
- type X struct {
- c chan error
- nextx *X
- }
- type Y struct {
- X
- nexty *Y
- p *int
- }
- var head *Y
- for i := 0; i < 10; i++ {
- p := &Y{}
- p.c = make(chan error)
- if head != nil {
- p.nextx = &head.X
- }
- p.nexty = head
- p.p = new(int)
- *p.p = 42
- head = p
- runtime.GC()
- }
- for p := head; p != nil; p = p.nexty {
- if *p.p != 42 {
- t.Fatal("corrupted heap")
- }
- }
-}
-
-func TestGcLastTime(t *testing.T) {
- ms := new(runtime.MemStats)
- t0 := time.Now().UnixNano()
- runtime.GC()
- t1 := time.Now().UnixNano()
- runtime.ReadMemStats(ms)
- last := int64(ms.LastGC)
- if t0 > last || last > t1 {
- t.Fatalf("bad last GC time: got %v, want [%v, %v]", last, t0, t1)
- }
-}
-
-func BenchmarkSetTypeNoPtr1(b *testing.B) {
- type NoPtr1 struct {
- p uintptr
- }
- var p *NoPtr1
- for i := 0; i < b.N; i++ {
- p = &NoPtr1{}
- }
- _ = p
-}
-func BenchmarkSetTypeNoPtr2(b *testing.B) {
- type NoPtr2 struct {
- p, q uintptr
- }
- var p *NoPtr2
- for i := 0; i < b.N; i++ {
- p = &NoPtr2{}
- }
- _ = p
-}
-func BenchmarkSetTypePtr1(b *testing.B) {
- type Ptr1 struct {
- p *byte
- }
- var p *Ptr1
- for i := 0; i < b.N; i++ {
- p = &Ptr1{}
- }
- _ = p
-}
-func BenchmarkSetTypePtr2(b *testing.B) {
- type Ptr2 struct {
- p, q *byte
- }
- var p *Ptr2
- for i := 0; i < b.N; i++ {
- p = &Ptr2{}
- }
- _ = p
-}
-
-func BenchmarkAllocation(b *testing.B) {
- type T struct {
- x, y *byte
- }
- ngo := runtime.GOMAXPROCS(0)
- work := make(chan bool, b.N+ngo)
- result := make(chan *T)
- for i := 0; i < b.N; i++ {
- work <- true
- }
- for i := 0; i < ngo; i++ {
- work <- false
- }
- for i := 0; i < ngo; i++ {
- go func() {
- var x *T
- for <-work {
- for i := 0; i < 1000; i++ {
- x = &T{}
- }
- }
- result <- x
- }()
- }
- for i := 0; i < ngo; i++ {
- <-result
- }
-}