[MITgcm-support] Suggestions for making MITgcm accessible

Jens-Olaf Beismann jbeismann at hpce.nec.com
Thu Jun 7 08:28:16 EDT 2007

Dear MITgcm users,

> This "philosphy" works fairly well for most single cpu and parallel 
> computer architectures, although I am now struggling with a vector 
> computer for which the MITgcm is only efficient if the horizontal domain 
> size is fairly large (because the code generally excludes vectorization 
> in the vertical dimension, and that's not likely to change).

just a quick comment regarding the use of the MITgcm on vector machines: 
I'm not familiar with Martin's application, but I know several MITgcm 
configurations which are used very efficiently on SX machines at other 
computing centres. These are "medium-sized" regional ocean models, and 
they typically run at appr. 25-35% of the theoretical peak performance.

As Martin pointed out, it is necessary to have a completely vectorised 
code to achieve good vector performance, but there is no general problem 
in running the MITgcm on a vector machine.

Best regards,

Dr. Jens-Olaf Beismann           Benchmarking Analyst
NEC High Performance Computing Europe GmbH
Prinzenallee 11, D-40549 Duesseldorf, Germany
Tel: +49 4326 288859 (office)  +49 160 183 5289 (mobile)
Fax: +49 4326 288861              http://www.hpce.nec.com

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