RE: Balancing XEONS and AMD Opterons in a 2.4.26-om1 cluster

So you're running your applications in i386 mode with no hardware
optimization and in 32 bit?  

That's really throwing away that hardware investment.

Do a test.  Run the application single processor on one of your machines
this way, then recompile with -xP or -ipo -03 and 64 bit. (xeon setting
for intel compiler)  The difference may be nearly 30-40%.  If you find
that running your code optimized for your platform increases your
performance by 30% you may rethink adding more nodes to the cluster.

If it was my equipment I'd have two clusters.  Or depending on your
application, make separate installs for each box and optimize the hell
out of it and when you migrate a process to a new machine your using the
executable specific for that box.  (that defiantly wouldn't work for MPI
apps, but it would for other canned applications like if your apps are
using sockets, or are trivially parallel) 

If your application is super memory bandwith intense, and you find that
you're only hitting 5% of the processor peak on number crunching anyway,
then you're just fine with what your doing.  CFD codes are like this. 


-evan T.

-----Original Message-----
From: openmosix-general-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
[mailto:openmosix-general-admin-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org] On Behalf Of
Vincent Hanquez
Sent: Tuesday, November 01, 2005 10:33 AM
To: Matt W
Cc: openmosix-general-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org
Subject: Re: [openMosix-general] Balancing XEONS and AMD Opterons in a
2.4.26-om1 cluster

On Tue, Oct 25, 2005 at 10:30:03AM -0700, Matt W wrote:
> Am I nuts to even think this way?  :)

well the Opteron running in legacy mode (32bits) shouldn't be that
faster than Xeon nodes...

-- 
Vincent Hanquez


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