[Beowulf] Re: scalability

Jörg Saßmannshausen jorg.sassmannshausen at strath.ac.uk
Thu Dec 10 06:56:29 PST 2009

Hi Doug,

I have heard of Open-MX before, do you need special hardware for that? We are 
currently using one GB network here on the cluster (for everything: NFS, 
MPI...) and I would like to increase the performance for the parallel codes I 
am using (NWChem, cp2k, GAMESS) without dishing out too much money for IB or 
Myrinet as the cluster is too small for them (22 nodes right now).

All the best


On Thursday 10 December 2009 13:50:51 beowulf-request at beowulf.org wrote:
> Date: Thu, 10 Dec 2009 08:45:30 -0500 (EST)
> From: "Douglas Eadline" <deadline at eadline.org>
> Subject: Re: [Beowulf] scalability
> To: "amjad ali" <amjad11 at gmail.com>
> Cc: Beowulf Mailing List <beowulf at beowulf.org>
> Message-ID: <51346. at mail.eadline.org>
> Content-Type: text/plain;charset=iso-8859-1
> The performance of GigE can vary widely based on several
> issues:
>  - chipset
>  - driver
>  - driver settings (interrupt coalescing etc.)
>  - switch performance under load
>  - switch manufacturer
> A well tuned GigE network is never as good as
> IB or Myrinet, but it can work well for some codes.
> You can also try using Open-MX instead of TCP
> for MPI communications.
> --
> Doug

Jörg Saßmannshausen
Research Fellow
University of Strathclyde
Department of Pure and Applied Chemistry
295 Cathedral St.
G1 1XL

email: jorg.sassmannshausen at strath.ac.uk
web: http://sassy.formativ.net

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