[MITgcm-support] darwinism and mpi

[Samar Khatiwala]

Nicolas:

If you are installing MPI for the first time, I suggest getting  
mpich2. The LAM-MPI
project is now defunct. (You can still download it, but further  
development has stopped.)
A pity because it was so much nicer to use - at least on Mac OS X -  
than mpich.
I believe LAM is now part of the Open MPI project.

Samar

On Nov 10, 2005, at 2:36 PM, Dmitri Leonov wrote:

> 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)
>> Tallahassee, FL - 32306    wienders at ocean.fsu.edu
>>
>>
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