Arndt Droullier wrote:

Hello Arndt

I'm trying to find a memory leak in a zope appliction and started to
test how zope memory consume behaves basically under load.

I'm having exactly the same problem, but under linux using Python 2.3.3 and Zope 2.7.0. First time I noticed this behaving was with Zope 2.6.4 using Python 2.1.3. Than I recreated our internal zope package just updating Python from 2.1.3 to Python 2.3.3 but the problem remained.

The current result is: Zope constantly consumes more memory.

Jup, exactly, the memory consumption goes up and up and up till the machine starts swapping and gets deadly slow.

The testcase is: 12 http clients request constantly request the same
page template (it does not contain any tal statements and only 10 lines
of HTML) in a simple folder. The increase is about 50 - 100 kb / minute.
I´m using Windows 2000 as server platform.

My test case is quiet similar. I wrote a Perl script which requests continuously the same page template (which contains some basic DTML stuff).

The database cache and debug information on the control panel seem allright.

The debug information looks rather strange to me, but I don't know anything about internals of Zope. Anyway I have here reference counts going up fast. Don't know whether this is normal or not.

Class   March 22, 2004 5:26 pm  March 22, 2004 5:38 pm  Delta
Acquisition.ImplicitAcquirerWrapper     850     18136   +17286
ZPublisher.HTTPRequest.HTTPRequest      145     3026    +2881
ZServer.HTTPResponse.ZServerHTTPResponse        139     3019    +2880
ZPublisher.BaseRequest.RequestContainer         135     3015    +2880
DateTime.DateTime.DateTime      51      52      +1

I'll let you know, should I find some solution (apart from restarting :-)).

Now I wonder if there´s basically a problem with Zope 2.7? Has anyone
made the same experience? Or an explanation why this happens?

Thanks, Arndt.

Have nice day.


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