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// $G $D/$F.go && $L $F.$A && ./$A.out
// Copyright 2009 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.
// Random malloc test.
package main
import (
"flag";
"malloc";
"rand";
"unsafe";
)
var chatty = flag.Bool("v", false, "chatty");
var footprint uint64;
var allocated uint64;
func bigger() {
if f := malloc.GetStats().Sys; footprint < f {
footprint = f;
if *chatty {
println("Footprint", footprint, " for ", allocated);
}
if footprint > 1e9 {
panicln("too big");
}
}
}
// Prime the data structures by allocating one of
// each block in order. After this, there should be
// little reason to ask for more memory from the OS.
func prime() {
for i := 0; i < 16; i++ {
b := malloc.Alloc(1<<uint(i));
malloc.Free(b);
}
for i := uintptr(0); i < 256; i++ {
b := malloc.Alloc(i<<12);
malloc.Free(b);
}
}
func memset(b *byte, c byte, n uintptr) {
np := uintptr(n);
for i := uintptr(0); i < np; i++ {
*(*byte)(unsafe.Pointer(uintptr(unsafe.Pointer(b))+i)) = c;
}
}
func main() {
flag.Parse();
// prime();
var blocks [1] struct { base *byte; siz uintptr; };
for i := 0; i < 1<<12; i++ {
if i%(1<<10) == 0 && *chatty {
println(i);
}
b := rand.Int() % len(blocks);
if blocks[b].base != nil {
// println("Free", blocks[b].siz, blocks[b].base);
malloc.Free(blocks[b].base);
blocks[b].base = nil;
allocated -= uint64(blocks[b].siz);
continue
}
siz := uintptr(rand.Int() >> (11 + rand.Uint32() % 20));
base := malloc.Alloc(siz);
// ptr := uintptr(syscall.BytePtr(base))+uintptr(siz/2);
// obj, size, ref, ok := allocator.find(ptr);
// if obj != base || *ref != 0 || !ok {
// panicln("find", siz, obj, ref, ok);
// }
blocks[b].base = base;
blocks[b].siz = siz;
allocated += uint64(siz);
// println("Alloc", siz, base);
memset(base, 0xbb, siz);
bigger();
}
}
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