[Zope] Request time grows with memory size

[Peter Bengtsson]

What have you done to investigate memory leaks?
What external connectors are you using, like MySQL or LDAP?

2009/4/27 Gerhard Schmidt <estartu at ze.tum.de>:
> HI,
>
> I've encounters a performance Problem with Zope. Some requests take very
> long time to process while others are served very fast. All request go for
> the URL. The time for the delayed Requests grows with the memory size of
> the Zope Process. It's direct proportional.
>
> I have generated a chart showing the request times and memory size of the
> Zope Process. The chart can be found at http://etustar.ze.tum.de/frontend.jpg
>
> Our watchdog system restarts the Zope Process when it reaches 7.3 Gig
> Memory. The physical memory of the server is 16 Gig and its only used for
> the zope Server. There are at least 7 Gig Memory free.
>
> As you can see most of the requests are delivered within 2 seconds but some
> take up to 12 seconds. The Requests monitored are the request of our
> watchdog system. These requests are send approximately every 20 sec.
>
> When I set the restart memory limit higher the request time of the delayed
> request continues to grows proportionally.
>
> This server is part of a pool of 19 Servers. All are connected to one ZEO
> server. All show the same effect.
>
> We observe the same effect with regular requests. Some are served at normal
> speed but some requests are delayed.
>
> Any idea what causes this effect and how to fix it.
>
> Greetings
>        Gerhard Schmidt
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