[Beowulf] Slection from processor choices; Requesting Giudence

Michael Will mwill at penguincomputing.com
Thu Jun 15 12:55:35 PDT 2006

Dual cpu single core, opteron. Make sure that the 1G of RAM are enough
for your application.
Also consider a low latency interconnect, i.e. infiniband because I have
seen cases where
CFD exchanges a lot of small messages.

Michael Will
SE Technical Lead
Penguin Computing


-----Original Message-----
From: beowulf-bounces at beowulf.org [mailto:beowulf-bounces at beowulf.org]
On Behalf Of Mikhail Kuzminsky
Sent: Thursday, June 15, 2006 6:07 AM
To: amjad ali
Cc: beowulf at beowulf.org
Subject: Re: [Beowulf] Slection from processor choices; Requesting

In message from "amjad ali" <amjad11 at gmail.com> (Thu, 15 Jun 2006
04:02:12 -0400):
>We are going to build a true Beowulf cluster for Numerical Simulation 
>of Computational Fluid Dynamics (CFD) models at our university. My 
>question is that what is the best choice for us out of the following 
>choices about processors for a given fixed/specific amount/budget:
>   1.
>   One processor at each of the compute nodes
>   2.
>   Two processors (on one mother board) at each of the compute nodes
>   3.
>   Two Processors (each one dual-core processor) (total 4 cores on the
>   board) at each compute nodes.
>   4.
>   four processor (on one mother board) at each of the compute nodes.
> Initially, we are deciding to use Gigabit ehternet switch and 1GB of 
>RAM at each node.

I've heard many times that memory throughput is extremally important in
CFD and that using of 1 cpu/1 core per node (or 2 single cores Opteron
having independed memory channels) is in some cases better than any
sharing of memory bus(es).

Mikhail Kuzminsky
Zelinsky Institute of Organic Chemistry

>Please guide me that how much parallel programming will differ for the 
>above four choices of processing nodes.
>with best regards:
>Amjad Ali.

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