Status: New
Owner: ----
New issue 2654 by [email protected]: Snapshot::NewContextFromSnapshot()
takes a lot of time after a major GC
http://code.google.com/p/v8/issues/detail?id=2654
To repro:
1. Use DumpRenderTree to run this:
<html>
<head>
<script>
function create_iframe() {
var iframe = document.createElement("iframe");
document.body.appendChild(iframe);
document.body.removeChild(iframe);
}
function do_test() {
for (var i = 0; i < 1000; ++i) {
create_iframe();
}
}
</script>
</head>
<body onload="do_test()">
</body>
</html>
2. Put some debug prints in V8GCController::minorGCPrologue /
majorGCPrologue. Put timing debug prints around
Snapshot::NewContextFromSnapshot(); in Genesis::Genesis.
The timing code used for this was this crude version:
struct timeval tv_start, tv_stop;
gettimeofday(&tv_start, NULL);
<stuff>
gettimeofday(&tv_stop, NULL);
fprintf(stderr, "snapshot deserialization %ld\n", 1000000 * (tv_stop.tv_sec
- tv_start.tv_sec) + tv_stop.tv_usec - tv_start.tv_usec);
Observation: Normally Snapshot::NewContextFromSnapshot() takes around 100
microseconds, but there are bumps where it takes up to 24000 microseconds.
These bumps always occur right after a major gc (though, after some major
gcs there is no bump).
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