2009年04月02日
Safari3のメモリ管理が何か変?
今のところSafari3限定 (確認したのはバージョン 3.2.1 (5525.27.1))なのだが、IMGタグを追加したりremoveしまくってたりすると、どんどん使用メモリが増えてくる現象を発見した。
Safari4のβ版やらFirefoxではそういった事にならないのは確認したが、単純なDOM操作なのにもりもりメモリを使って行く。
ウインドウを閉じてもメモリは解放されずに、解放しなかったメモリは内部的に再利用してるっぽい。
で、閉じる前に確保してたメモリ領域を使い切ったっぽいポイントでまたメモリをもりもり食べ出す。
まるでメモリプールみたいな感じなんだがウインドウを閉じるまで再利用されてない感じなんだ。
ちなみにSRC属性を指定しないとメモリがもりもり増えなかったりする。
以下のHTMLをローカルに保存して、保存した所と同じディレクトリにdummy.pngという適当な画像を置いてからブラウザで開いて下さい。
メモリが増える様子はアクティビティモニタ等で見るとわかり易いでしょう。
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html><head>
<title>memory leak test</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<meta http-equiv="content-script-type" content="text/javascript">
<script>
var count = 0;
var is_run = true;
var $ = function(id){
return document.getElementById(id);
};
var reload = function(){
var container = $("container");
while (container.childNodes.length > 0) {
container.removeChild(container.childNodes[0]);
}
add();
};
function add(){
$("count").innerHTML = count++;
var i;
for (i = 0; i < 100 ; i++) {
var img = document.createElement('img');
img.src = "dummy.png";
$("container").appendChild(img);
}
if (is_run) setTimeout(reload, 100);
}
window.onload = function(){
$("reload").addEventListener("click", reload, false);
$("stop").addEventListener("click", function(){
is_run = false;
}, false);
add();
};
</script>
</head><body>
<div id="stop">stop</div>
<div id="reload">reload</div>
<div id="count">0</div>
<div id="container"></div>
</body></html>
きっとamachangなら理由わかってそうだなー。という気はしてる。
おまけ
leaksコマンドと言う便利コマンドがあるので、実行したりウインドウ閉じたり開いたりした時の結果もはっときます。
なんか色々leakしてるけど、今回と関係あるかどうかはわからない。
実行当初
$ leaks 7011 Process 7011: 199039 nodes malloced for 19823 KB Process 7011: 0 leaks for 0 total leaked bytes.
どんどんメモり増える
$ leaks 7011 Process 7011: 305529 nodes malloced for 30869 KB Process 7011: 0 leaks for 0 total leaked bytes.
凄い増えた
$ leaks 7011 Process 7011: 1067031 nodes malloced for 107063 KB Process 7011: 0 leaks for 0 total leaked bytes.アクティビティモニタのRSIZEももりもり増える
ウインドウ閉じる
$ leaks 7011 Process 7011: 205175 nodes malloced for 20180 KB Process 7011: 1 leak for 16 total leaked bytes. Leak: 0x1ca2dbc0 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x15015080 0x00000004 0x00000000 ..[..P..........mallocedのサイズが減ってるけどRSIZは変わらず。そして1個リーク。
ウインドウ開いた
$ leaks 7011 Process 7011: 205273 nodes malloced for 20262 KB Process 7011: 4 leaks for 64 total leaked bytes. Leak: 0x16c0d300 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x02015080 0x00000004 0x00000000 ..[..P.......... Leak: 0x1ca2dbc0 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x15015080 0x00000004 0x00000000 ..[..P.......... Leak: 0x1ca376a0 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x01015080 0x00000004 0x00000000 ..[..P.......... Leak: 0x1cae0120 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x03015080 0x00000004 0x00000000 ..[..P..........RSIZEかわらず。3個リーク増えた。
再度実行
$ leaks 7011 Process 7011: 269750 nodes malloced for 26522 KB Process 7011: 4 leaks for 64 total leaked bytes. Leak: 0x16c0d300 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x02015080 0x00000004 0x00000000 ..[..P.......... Leak: 0x1ca2dbc0 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x15015080 0x00000004 0x00000000 ..[..P.......... Leak: 0x1ca376a0 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x01015080 0x00000004 0x00000000 ..[..P.......... Leak: 0x1cae0120 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x03015080 0x00000004 0x00000000 ..[..P..........
またまた増えた
$ leaks 7011 Process 7011: 1354957 nodes malloced for 131749 KB Process 7011: 4 leaks for 64 total leaked bytes. Leak: 0x16c0d300 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x02015080 0x00000004 0x00000000 ..[..P.......... Leak: 0x1ca2dbc0 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x15015080 0x00000004 0x00000000 ..[..P.......... Leak: 0x1ca376a0 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x01015080 0x00000004 0x00000000 ..[..P.......... Leak: 0x1cae0120 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x03015080 0x00000004 0x00000000 ..[..P..........
もっかいウインドウ閉じた
$ leaks 7011 Process 7011: 209735 nodes malloced for 20861 KB Process 7011: 5 leaks for 80 total leaked bytes. Leak: 0x16c0d300 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x02015080 0x00000004 0x00000000 ..[..P.......... Leak: 0x1ca2dbc0 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x15015080 0x00000004 0x00000000 ..[..P.......... Leak: 0x1ca376a0 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x01015080 0x00000004 0x00000000 ..[..P.......... Leak: 0x1cadd650 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x0b015080 0x00000004 0x00000000 ..[..P.......... Leak: 0x1cae0120 size=16 instance of 'TSMInputSource', type CFType, implemented in HIToolbox 0xa05bcee0 0x03015080 0x00000004 0x00000000 ..[..P..........リーク増えた Posted by Yappo at 2009年04月02日 21:04 | TrackBack | tech
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