[Beowulf] Maximizing intra-node communication performance

Michael Will mwill at penguincomputing.com
Wed Dec 28 13:51:53 PST 2005

Exactly. if it is an 8-way SMP you should try to use shared
memory. At least for mpich I know there is a shared memory
model option. If you have several of the 8-way boxes to work
across you might want to think about MPI/OpenMP hybrid code.


-----Original Message-----
From: beowulf-bounces at beowulf.org [mailto:beowulf-bounces at beowulf.org]
On Behalf Of ctierney at hypermall.net
Sent: Wednesday, December 28, 2005 1:25 PM
To: Vincent Diepeveen
Cc: Tahir Malas; beowulf at beowulf.org
Subject: Re: [Beowulf] Maximizing intra-node communication performance

Quoting Vincent Diepeveen <diep at xs4all.nl>:

> Are you looking for a hardware solution (so paying money to get some 
> great inter-node performance) or searching for a software solution 
> that's better than MPI?
> The first costs some money, but with great certainty reduces your 
> problem.
> The second will be years of experimental software, bugs and if you're 
> lucky it's 1% better.
> How much improvement do you need and on what area?
> Did you install some SSI type solution also?
> That might be a performance killer.
> Vincent
> At 12:05 27-12-2005 +0200, Tahir Malas wrote:
> >Hi all,
> >Taking advice from a previous discussion, we have purchased an Tyan 
> >server with 8 dual-core Opteron 870 processors. Now I want to wonder 
> >how I can maximize the intra-node communication of the server. We 
> >have been using LAM-MPI, but I think that TCP/IP protocol may degrade

> >the performance. Has anybody tried new implementations of MPI, or 
> >anybody knows some other support for intra-node communication?
> >Thanks in advance,
> >Tahir Malas
> >Bilkent University
> >Electrical and Electronics Engineering Department
> >Phone: +90 312 290 1385
> >

Does LAM-MPI not have a shared memory device for intra-node
communication?  How about changing your MPI implementation to one that


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