[Zope] strange performance problem

[Jean-Francois.Doyon at CCRS.NRCan.gc.ca]

Dennis,

This is in direct correlation with the check interval suggestion I made.

In your search, you will find that on SMTP systems, tweaking the check
interval can help things, precisely because of the GIL.

I set it to zero because I had the spare CPU power, and trying to fully
understand/benchmark python's behavior on SMTP seemed like too much work :P

J.F.

-----Original Message-----
From: zope-bounces at zope.org [mailto:zope-bounces at zope.org]On Behalf Of
Dennis Allison
Sent: Tuesday, March 23, 2004 10:39 AM
To: Chris Withers
Cc: zope at zope.org
Subject: Re: [Zope] strange performance problem


Thanks.  I'll review the archives.  -d

On Tue, 23 Mar 2004, Chris Withers wrote:

> Dennis Allison wrote:
> 
> > While it's possible, the scheduler is pretty good at maintaining
processor
> > affinity without intervention.  I have *never* seen anything which would
> > suggest that is a problem.  This is happening on an unloaded system when
> > processor affinity issues should be hard to trigger.
> 
> Okay, but I have lots of memories of reading about problems with Python's
Global 
> Interpretter Lock and lightly loaded multi-processor machines.
> 
> The mailinglist archives may give more of a clue.
> 
> One thing you could try is to get a ZEO storage server up and running,
then run 
> up 4 or 5 ZEO clients, but each with only one thread. Then you just need
to 
> figure out how to round-robin them so they all appear through one port...
> 
> cheers,
> 
> Chris
> 
> -- 
> Simplistix - Content Management, Zope & Python Consulting
>             - http://www.simplistix.co.uk
> 


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