[Webkit-unassigned] [Bug 39825] New: Memory retention using timers

Thu May 27 03:48:44 PDT 2010

https://bugs.webkit.org/show_bug.cgi?id=39825

           Summary: Memory retention using timers
           Product: WebKit
           Version: 528+ (Nightly build)
          Platform: Macintosh Intel
        OS/Version: Mac OS X 10.6
            Status: UNCONFIRMED
          Severity: Major
          Priority: P2
         Component: JavaScriptCore
        AssignedTo: webkit-unassigned at lists.webkit.org
        ReportedBy: huntc at internode.on.net

Created an attachment (id=57216)
 --> (https://bugs.webkit.org/attachment.cgi?id=57216)
Screen shot of memory consumption

I'm wondering if there's a memory retention issue given the use of timers. Here's some html:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html>
    <head>
        <title>Timer Memory Retention</title>
    </head>
    <body>
        <p>Please observe memory usage with the timeline profiler.</p>
        <script type="text/javascript">
            setInterval(null, 100);
        </script>
    </body>
</html>

What we have is a script that simply sets up a timer to execute every 100ms. It makes no difference to the test whether a function is called on the timer firing.

If you load this and then use the timeline profile then you should observe memory continue to be consumed. Within a couple of minutes memory usage doubles. I have had this running for several minutes with no apparent reduction in the rate of memory consumed.

I have attached a screenshot of the memory consumption timeline.

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