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

[sean.upton@uniontrib.com]

This sounds better (and I think this is more advanced that the stuff RedHat
is doing, using Ingo Molnar's work in the O2 scheduler), because it is (and
should be) in this case simply a sysadmin task to make sure your Zope
instances (and all the processes tied to a particular instance) is bound to
the same CPU.

This would also be nice in the case of being able to use a single SMP box to
run a ZEO cluster within using UNIX sockets for communication, and binding
your ZEO clients (and the ZSS) to respective processors.

Sean

-----Original Message-----
From: Oliver Bleutgen [mailto:myzope@gmx.net]
Sent: Tuesday, August 20, 2002 3:01 PM
To: sean.upton@uniontrib.com
Cc: zope@zope.org
Subject: Re: [Zope] Linux vs. UNIX vs. BSD


sean.upton@uniontrib.com wrote:


> Though we haven't used it yet, as I understand it, CPU affinity is
important
> to Python performance on SMP machines.   I expect that we will write or
find
> a simple user-space utility utilizing the new system calls to bind a group
> of processes to a single CPU.  I think, in theory, this will allow us to
> successfully run two Zope instances on an inexpensive 2CPU machine, each
> instance bound to a respective CPU.
> 
Heh, since I was looking at the page today, if you're talking about Robert
Loves 

work, you can find it here:
http://www.kernel.org/pub/linux/kernel/people/rml/cpu-affinity/

Very nice, since they have a proc-interface, so all you need is echo.

I haven't tested it, but it sounds nice.

cheers,
oliver