mirror of
https://github.com/golang/go
synced 2024-10-04 06:31:22 -06:00
63 lines
1.4 KiB
Go
63 lines
1.4 KiB
Go
// 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.
|
|
|
|
package main
|
|
|
|
import (
|
|
"allocator";
|
|
"rand"
|
|
)
|
|
|
|
var footprint int64;
|
|
var allocated int64;
|
|
func bigger() {
|
|
if footprint < allocator.footprint {
|
|
footprint = allocator.footprint;
|
|
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 := allocator.malloc(1<<uint(i));
|
|
allocator.free(b);
|
|
}
|
|
for i := 0; i < 256; i++ {
|
|
b := allocator.malloc(i<<12);
|
|
allocator.free(b);
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
// prime();
|
|
var blocks [1] struct { base *byte; siz int; };
|
|
for i := 0; i < 1 << 20; i++ {
|
|
if i%(1<<10) == 0 {
|
|
println(i);
|
|
}
|
|
b := rand.rand() % len(blocks);
|
|
if blocks[b].base != nil {
|
|
// println("Free", blocks[b].siz, blocks[b].base);
|
|
allocator.free(blocks[b].base);
|
|
blocks[b].base = nil;
|
|
allocated -= int64(blocks[b].siz);
|
|
continue
|
|
}
|
|
siz := rand.rand() >> (11 + rand.urand32() % 20);
|
|
base := allocator.malloc(siz);
|
|
blocks[b].base = base;
|
|
blocks[b].siz = siz;
|
|
allocated += int64(siz);
|
|
// println("Alloc", siz, base);
|
|
allocator.memset(base, 0xbb, siz);
|
|
bigger();
|
|
}
|
|
}
|