[mpas-developers] config_write_initial_output option

[Mark Petersen]

Michael,

Thanks for your thoughts.

I tested the ocean core using config_write_initial_output=.false. with 
both single and multiple frames per output file, and both worked as 
expected.  In both cases,
    mpas_output_state_init
is called the first time within a
   if(output_frame == 1) then
branch in mpas_*_mpas_core.F.  Is calling the initialization routine 
your concern for multiple frames?

Your more general implementation of time frames sounds good.  It is 
mostly a question of timing.  If you are thinking of making these 
changes in the next week or two, I'm happy to wait and you can use my 
branch if you like.  If it is a longer term improvement, I prefer to 
merge this config_write_initial_output flag to the trunk so I don't need 
to maintain a branch from which to run our large simulations.

Thanks,
Mark


On 05/10/12 14:24, Michael Duda wrote:
> Mark,
>
> I think this would be a useful option, though as currently implemented
> in the branch, I'm not sure that it would work as expected when there
> are multiple history frames written to the same file. I've also been
> looking at implementing this, and I have some changes to the IO layer to
> support appending time frames to an existing file that I think might be
> useful for a completely general implementation of the
> write_initial_output functionality. I can send these changes to you to
> take a look at, or I can merge them into the branch; just let me know.
>
> Michael
>
>
> On Thu, May 10, 2012 at 01:06:15PM -0600, Mark Petersen wrote:
>> MPAS Developers,
>>
>> I added the flag config_write_initial_output to all cores in the branch
>> ocean_projects/first_output_optional.  It simply controls if an output
>> file is written upon start-up.  The ocean core needs this for our large
>> runs, to save i/o and for simply time-averaged variables.  Because the
>> first file initialized in driver/mpas_subdriver.F, it affects all
>> cores.  In addition, it seems like a useful flag for everyone.
>>
>> I tested by compiling all four cores, and running with the ocean core.
>> Could someone run a little test with the atmospheric cores, switching
>> this flag on and off, and make sure it works as expected?  When I hear
>> back, I will merge the branch to the trunk.
>>
>> Thanks,
>> Mark
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