CPU Affinity, was RE: [Zope] Linux vs. UNIX vs. BSD

[sean.upton@uniontrib.com]

Hey Matt, while we are on the subject, I just wanted to make sure I had
something right (and figured you might know): 

I know that affinity helps a single Zope instance on an SMP box, but how
about 2?  With Python's global interpreter lock (or whatever makes
Python/Zope best suited to bind to a given CPU) - am I still going to run
into problems if I am using the same Python to run 2 Zope instances in
different software/instance homes, with all respective processes for each
given Zope bound (via affinity) to respective CPUs?  Or is this okay?  I
have some existing 2P AthlonMP and Xeon boxes, and I'd like to get the most
zoom out of their horsepower as possible...

Any thoughts are greatly appreciated.

Thanks,
Sean

-----Original Message-----
From: Matthew T. Kromer [mailto:matt@zope.com]
Sent: Wednesday, August 21, 2002 6:48 AM
To: zope@zope.org
Subject: Re: CPU Affinity, was RE: [Zope] Linux vs. UNIX vs. BSD


Tim Hoffman wrote:

>Thats what Solaris is for ;-) Processor affinity, processor sets, fair
>share scheduler etc.... 
>
>Rgds
>
>Tim
>  
>

The downside of Solaris is that Python executes more or less at the same 
speed on all CPUs, primarily determined by clock speed.  Thus, a 2 Ghz 
Pentium IV or Athlon blows away expensive SPARC CPUs for running Zope.

-- 
Matt Kromer
Zope Corporation  http://www.zope.com/ 




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