[MITgcm-support] Question about parallel run

[Martin Losch]

Ali,

you do not need different source code for each configuration, only your SIZE.h needs to change when you build the executable "mitgcmuv". I usually have different subdirectories when I want to try different numbers of cpus. The makefile-procedures just links the source code into the build directory so that you can use the same source code for all of you runs, except for SIZE.h which should then reside in a separate directory (specified by -mods at the genmake2 step).

The code is based on Fortran77, so all memory is allocated statically. I do not know of any plans to change that in the future.

Martin
On Jun 14, 2011, at 11:12 AM, Ali Nazemian wrote:

> Thanks a lot.
> So i should have a different source code per each run configuration and use it for example with SGE as a job scheduler? 
> Is it in developer road map to make MITgcm more portable? i mean change parallel configuration to runtime instead of compile time?
> Regards.
> 
> On Tue, Jun 14, 2011 at 6:10 PM, Stefano Querin <squerin at ogs.trieste.it> wrote:
> Hi Ali,
> 
> 
> Hi,
> I am wondering that should i recompile MITgcm each time that i want to run that on our cluster with different number of processors?!
> 
> Yes (as far as I know...), you have to recompile it.
> 
> 
> assume i want to run it on 10 processors, 16 processors , 20 processors and etc... should i change size.h file each time and recompile my code?
> 
> Yes.
> For more info:
> http://mitgcm.org/public/r2_manual/latest/online_documents/node102.html
> http://mitgcm.org/public/r2_manual/latest/online_documents/node181.html
> 
> 
> what if two or more user want to submit parallel job with MITgcm with different number of processors?
> 
> Just run them on separate folders...
> If many people want to perform several runs, you should also have a job scheduler installed on your cluster to handle the job queues.
> Ask your system administrator.
> 
> 
> have i need a different compiled code for each of them?!
> 
> Yes, one executable for each kind of domain decomposition.
> 
> Best Regards.
> -- 
> A.Nazemian
> 
> Cheers,
> 
> S.
> 
> 
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> 
> -- 
> A.Nazemian
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