[mpas-developers] alternate mesh decomposition file names

[Todd Ringler]

Hi Michael,

Thanks for keeping this on the list. The proposed change to  
accommodate different graph names looks fine to me.

I can't comment on the big-endian modification. I am happy to go with  
it if no one voices concern.

Cheers,
Todd

On Nov 29, 2010, at 1:25 PM, Michael Duda wrote:

> Hi, All.
>
> I'd like to propose a set of changes to the trunk that would allow
> us to specify the prefix for mesh decomposition files, as Todd
> suggested below. In the attached changes, I've used a new namelist
> variable config_decomp_file_prefix in the &io record, though I'm
> open to better suggestions. Also included in the attached tar file
> are changes to the top-level Makefile to use big-endian format for
> unformatted reads and writes, which we'll be using for lookup
> tables in atmospheric physics and for initial atmospheric fields
> for real-data simulations.
>
> If there are any questions or comments, please don't hesitate to
> let me know!
>
> Cheers,
> Michael
>
>
> On Wed, Oct 27, 2010 at 01:12:20PM -0600, Todd Ringler wrote:
>>
>> ...
>>
>> On another note (that is related to this topic because it is done  
>> at init) is the issue of graph.info.part.* . If have two  
>> recommendations that we can consider to be a part of this  
>> reorganization or addressed separately.
>>
>> The first is that we might want to be able to specify the  
>> "graph.info.part" part of the input file through the namelist. We  
>> are generating a lot of meshes and the graph files go with the  
>> meshes. Metis names the graph files to be analogous to the grid  
>> files and this makes sense. As a result, I do a lot of copying like  
>> "cp x1.2562.graph.info.part.8 graph.info.part.8" into my run  
>> directory. A generalization would make the graph input similar the  
>> grid input, i.e. we can specify the form of both. The difference  
>> here is that we would require a way to get the number of tasks at  
>> runtime (before opening the graph file) in order to complete the  
>> graph file name.
>>
>> The second graph issue is that we should be able to run the model  
>> with "mpirun -np 1 ocean.exe" with no graph file present. I have  
>> verified that the model runs in this mode by creating my own  
>> graph.info.part.1 files (kmetis will not produce these!). This  
>> configuration essentially turns off the MPI and provides a means of  
>> testing certain aspects of the model. I guess that this would be  
>> pretty trivial if, again, we could we can retrieve the number of  
>> processors before opening the graph file.
>>
>> This might be more of a "graph" issue than an "init" issue and we  
>> might be better off pushing this to a later reorganization. I just  
>> wanted to bring it up now in case you think that it is easy to  
>> address at present.
>>
>> Thanks again for putting together a reorg of the init procedure.
>>
>> Cheers,
>> Todd
>>
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