[Dojo-interest] Memory leaks in Javascript-created widgetsandevent handlers?

[Alex Russell]

On Wednesday 03 January 2007 1:12 am, Martin Kou wrote:
> Here's a video of what happend, notice the VM size was increasing
> rapidly as I clicked create and destroy. This is incorrect behavior
> since the VM size indicates the virtual memory address space
> allocated to the browser.
>
> http://hkpcug.homeftp.net/~francium/leak_demo.swf.html
>
> (2.1MB video warning)

Just to be very clear, unless I'm seeing the video wrong, what you're 
describing is increasing memory usage *in a single page*. Leakage, as 
is usually defined WRT MSIE, is defined by un-recovered memory across 
page loads, not an increase in memory footprint inside the same page 
environment.

We may be able to do something about the later, but we've spend our time 
dealing with the former to date, as it has truly debilitating 
consequences for long-term usage.

Regards

> In the video I've minimized the IE window once and restored it to
> demonstrate the "Mem usage" column (the working set size) is highly
> volatile and cannot be used for memory leak evaluation (there seems
> to be nothing wrong if you only look at the mem usage column).
>
> ----- Original Message -----
> From: "Jayaram" <jkrishnaswamy at comcast.net>
> To: <dojo-interest at dojotoolkit.org>
> Sent: Wednesday, January 03, 2007 4:21 AM
> Subject: Re: [Dojo-interest] Memory leaks in Javascript-created
> widgetsandevent handlers?
>
> >I used your code to test your complaint, but I did not observe
> > anything unusual.  Could you quantify waht you are saying? Your
> > create and estroy worked without any problem.  The  destroy
> > destoyed items created repeatedly all at once. I am intereseted in
> > knowing waht yous aw in the Windows Task Manager window. The event
> > handlers also worked for each of the Hello World!.
> >
> > Jayaram
> > ----- Original Message -----
> > From: "Martin Kou" <bitanarch at gmail.com>
> > To: <dojo-interest at dojotoolkit.org>
> > Sent: Sunday, December 31, 2006 4:56 AM
> > Subject: [Dojo-interest] Memory leaks in Javascript-created widgets
> > andevent handlers?
> >
> >> Hi,
> >>
> >> I'm new to Dojo Toolkit - I've just started learning it last week.
> >> I started
> >> learning it by writing some simple, proof-of-concept dynamic pages
> >> (where widgets can be created and destoryed without being
> >> refreshed - I haven't touched on the ajax stuff yet). I think I've
> >> done something wrong, and I've
> >> tried things like dojo.event.browser.clean() that popped up in
> >> this mailing
> >> list and Alex's December 2005 blog entries for similar problems,
> >> but to no
> >> avail.
> >>
> >> First page I constructed with Dojo:
> >> http://hkpcug.homeftp.net/~francium/dojo-0.4.1-ajax/dojo_leak_dom.
> >>html
> >>
> >> Second page I constructed with Dojo:
> >> http://hkpcug.homeftp.net/~francium/dojo-0.4.1-ajax/dojo_leak_widg
> >>et.html
> >>
> >> Notice that the links might be very slow or even unreachable,
> >> because my server is located in Hong Kong, and the international
> >> links from here are damaged right now due to last week's
> >> earthquake in Taiwan. For this reason,
> >> I've attached the .html file to my post as well.
> >>
> >> In both examples, clicking "Creating xxx widgets" and then
> >> "Destroy All" repeatedly in IE6 or IE7 would lead to the vmsizes
> >> of both browsers (as observed from Window's Task Manager) increase
> >> rapidly. How can I correct this problem? And could anyone kindly
> >> point to the reason why is it happening?
> >>
> >> Best Regards,
> >> Martin Kou
> >
> > -------------------------------------------------------------------
> >-------------
> >
> >> _______________________________________________
> >> Dojo FAQ: http://dojo.jot.com/FAQ
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> >> Dojo-interest at dojotoolkit.org
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> >
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> >-------------
> >
> >
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> >
> > _______________________________________________
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-- 
Alex Russell
alex at sitepen.com     A99F 8785 F491 D5FD 04D7 ACD9 4158 FFDF 2894 6876
alex at dojotoolkit.org BE03 E88D EABB 2116 CC49 8259 CF78 E242 59C3 9723
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