[MITgcm-support] darwinism and mpi

[Dmitri Leonov]

Hi Nicolas,

I'm using LAM mpi 7.1.1 with xlf 8.1 on a cluster of dual G5s under OSX 
10.3.
I usually run shared memory experiments using 2 cpus on one node - 
because the experiments are 2d with about 400x50 grid size, but I've 
used it across nodes as well - and it seemed to work too, but slower 
than on one node.

Cheers,
Dmitri

P.S.

Just curious: does anyone know what exactly 'usingMPI' flag means?
In a shared-memory run on 1 dual-cpu node (mpirun c2,3 -D 
<fullpath>/mitgcmuv) both ascii output files show something like

(PID.TID 0001.0001) usingMPI =    F ; /* Flag used to control whether 
MPI is in use */

In fact MPI is obviously being used, for shared-memory though. (Version: 
checkpoint57p_post)

Thanks,
Dmitri


Nicolas Wienders wrote:

>
> Has anobody some experience with using MPI on Mac OS X ?
>
> Thank you.
> Have a good long week-end.
>
>
> -- 
>
> Nicolas Wienders                   (850) 644-1987 (office)
> Oceanography - OSB415                294-3542 (cell)
> Florida State University                    644-2581 (fax)
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>
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