Status: Accepted
Owner: [email protected]
CC: [email protected], [email protected], [email protected]
Labels: Type-Bug Priority-Medium Harmony
New issue 2699 by [email protected]: WeakMaps cause long GC pauses
http://code.google.com/p/v8/issues/detail?id=2699
Using large WeakMaps to store many references introduces long GC pauses.
The following snippet reproduces the problem in Chrome by starting the
DevTools timeline recording and repeatedly click the refresh button.
<script>
/*
// array for storage
var map = []
function add(key, value) {
map.push(key, value);
}
*/
// weakmap for storage
var map = new WeakMap
function add(key, value) {
map.set(key, value);
}
setTimeout(function() {
for (var i = 0; i < 1000000; i++)
add({}, {});
}, 1000);
</script>
Attachments:
Array GC.png 258 KB
WeakMap GC.png 260 KB
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