golang precise gc

[刘桂祥]

package main

import (

"fmt"

"runtime"

"unsafe"

)

func main() {

var m runtime.MemStats

runtime.ReadMemStats(&m)

println(m.HeapObjects, m.Mallocs)

runtime.GC()

runtime.ReadMemStats(&m)

println(m.HeapObjects, m.Mallocs)

runtime.GC()

runtime.ReadMemStats(&m)

println(m.HeapObjects, m.Mallocs)

p := foo()

runtime.ReadMemStats(&m)

println(m.HeapObjects, m.Mallocs)

runtime.GC()

runtime.ReadMemStats(&m)

println(m.HeapObjects, m.Mallocs)

println(*((*int)(unsafe.Pointer(p))))

foo1()

println(*((*int)(unsafe.Pointer(p))))

}

func foo() uintptr {

i := new(int)

*i = 1000

if false {

fmt.Sprintf("%v", i)

}

return uintptr(unsafe.Pointer(i))

}

func foo1() uintptr {

i := new(int)

*i = 2000

if false {

fmt.Sprintf("%v", i)

}

return uintptr(unsafe.Pointer(i))

}

[Ian Lance Taylor]

I don't understand what you are trying to say.

Note that your code uses unsafe.Pointer in an unsupported way. See
https://golang.org/pkg/unsafe/#Pointer .

Ian

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