[Twisted-web] Guard, LastPage Memory Leak?

Federico Tomassini federicotom at yahoo.it
Tue Jul 28 09:17:51 EDT 2009

Federico Tomassini wrote:
> Dear Glyph,
> see answers below. I'm debugging with pdb and gc. Maybe I
> discovered something, but the debug process is slow.
> Glyph Lefkowitz wrote:
>>     So, I created a WastingMemPage(rand.Page) class
>> Rather than wasting lots of memory to debug, why not use 
>> gc.get_referrers to discover what's keeping your rend.Page instance 
>> alive?  Perhaps it's an object in your own application that you can get 
>> rid of.  Or, if it's a bug in Nevow, it will tell us where in Nevow.
> Ok. on Page.afterRender() I put `self` on a list. After 5 hits
> to this page, I'm checking where these pages are referred.
> I have this for the first page on the list:
>    WovenContext(tag=None, remembrances={'nevow.inevow.IMacroFactory':
> 	<myfile.pages.MyPage object at 0x4069eeac>})
> Do this tell you something?
>> Without access to your code — and, I would imagine, a pretty extensive 
>> debug log — I couldn't tell you exactly what's happening.
>> Can you construct a minimal example which demonstrates the problem, 
>> which someone on this list could run and debug?
> Yes. I will build a minimal framework.


I coded a minimal example. Problem seems to depend from
Bar.data_somedata(). If I remove the interested tag from the
docFactory, memory is released. When, instead, I use this
tag (and Bar.data_somedata()), memory is not released:


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