[MITgcm-support] parallelizing tutorial examples

[Nicolas Grisouard]

Hi Francis,

I also do this:

* when creating the makefile, I add -mpi as an option for the execution 
of genmake2 (although I'm sure sure if it's necessary),

* in eedata, I add line:
usingMPI=.TRUE.,

* This last bullet is very optional, its purpose is to get output fields 
that are not sliced in a number of files equal to the number of 
processors. So in data, I set globalFiles to TRUE (apparently it is not 
recommended) and in the same section, I add the following line:
useSingleCpuIO=.TRUE.,

That's how I've been told to proceed and I'd be interested myself to 
know if all of this is necessary. But unless I forgot anything, it sure 
works.

Cheers,
Nicolas.


On 4/28/11 1:05 PM, Francis Poulin wrote:
> Hello,
>
> I've just started using the MITgcm and I have a rather simple 
> questions.  I've been able to run many of the tutorials in serial and 
> they work beautifully.  To run them in parallel requires some 
> alterations and I'm hoping to find a list of what needs to be done. 
>  What I've figured out so far is:
>
> 1) Need to change the OPTFILE.  I think I've done this correctly since 
> it compiles ok.
>
> 2) Need to change the SIZE.h file (I actually used the SIZE.h_mpi that 
> I found in exp2).
>
> 3) When I ran it there was a problem with topog.bin.  I presume this 
> means that I need to recreate the data file in a way that is 
> consistent with MPI?
>
> I've looked through the manual and haven't found anything that lists 
> all the necessary changes.  I thought I'd ask just in case someone has 
> done this already.
>
> Thanks in advance for your time,
> Francis
>
>
> ------------------
> Francis Poulin
> Assistant Professor
> Department of Applied Mathematics
> University of Waterloo
>
> email: fpoulin at uwaterloo.ca <mailto:fpoulin at uwaterloo.ca>
> Web: http://www.math.uwaterloo.ca/~fpoulin/ 
> <http://www.math.uwaterloo.ca/%7Efpoulin/>
> Telephone:  +1 519 888 4567 x32637
>
>
>
>
>
>
>
>
>
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-- 
Nicolas Grisouard
Assistant Research Scientist
Courant Institute of mathematical Sciences
251 Mercer Street
New York, NY 10012
tel: (+1) 212-992-9920 -- room 927
http://nicolas.grisouard.free.fr

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