mirror of
https://github.com/golang/go
synced 2024-11-26 11:18:56 -07:00
3f8aa662e9
mark and sweep, stop the world garbage collector (intermediate step in the way to ref counting). can run pretty with an explicit gc after each file. R=r DELTA=502 (346 added, 143 deleted, 13 changed) OCL=20630 CL=20635
69 lines
1.6 KiB
Go
69 lines
1.6 KiB
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"allocator";
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"rand";
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"syscall"
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)
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var footprint int64;
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var allocated int64;
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func bigger() {
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if footprint < allocator.footprint {
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footprint = allocator.footprint;
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println("Footprint", footprint, " for ", allocated);
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if footprint > 1e9 {
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panicln("too big");
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}
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}
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}
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// Prime the data structures by allocating one of
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// each block in order. After this, there should be
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// little reason to ask for more memory from the OS.
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func prime() {
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for i := 0; i < 16; i++ {
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b := allocator.malloc(1<<uint(i));
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allocator.free(b);
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}
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for i := 0; i < 256; i++ {
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b := allocator.malloc(i<<12);
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allocator.free(b);
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}
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}
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func main() {
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// prime();
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var blocks [1] struct { base *byte; siz int; };
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for i := 0; i < 1 << 20; i++ {
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if i%(1<<10) == 0 {
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println(i);
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}
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b := rand.rand() % len(blocks);
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if blocks[b].base != nil {
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// println("Free", blocks[b].siz, blocks[b].base);
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allocator.free(blocks[b].base);
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blocks[b].base = nil;
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allocated -= int64(blocks[b].siz);
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continue
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}
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siz := rand.rand() >> (11 + rand.urand32() % 20);
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base := allocator.malloc(siz);
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ptr := uint64(syscall.BytePtr(base))+uint64(siz/2);
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obj, size, ref, ok := allocator.find(ptr);
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if obj != base || *ref != 0 || !ok {
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panicln("find", siz, obj, ref, ok);
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}
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blocks[b].base = base;
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blocks[b].siz = siz;
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allocated += int64(siz);
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// println("Alloc", siz, base);
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allocator.memset(base, 0xbb, siz);
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bigger();
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}
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}
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