[mpas-developers] MPAS Restart I/O

[Conrad Roesch]

Thank you all for the feedback.

The supplemental change allowing automatic selection of the latest available restart time has been well-received by the folks I've spoken to over here, so I propose that we make this additional functionality consistent across cores, and I would be happy to implement this.  However, since we are getting close to merging the atmospheric branch into the trunk, I propose that we first implement the one restart frame per file across all cores, merge that change along with the atmospheric branch into the trunk, and then add the additional restart-latest functionality in a separate merge.

The proposal to store the latest restart name in a latest_restart file and accepting the namelist values:
config_start_time = 'latest'
config_do_restart = .true.
seems like a suitable implementation to me, but if anyone has any adjustments to propose, please let me know.

Cheers,
Conrad



On Oct 25, 2011, at 1:27 PM, Todd Ringler wrote:

> 
> Hi Conrad,
> 
> Your email is very timely. I am also struggling a bit with the current restart setup.
> 
> Since we are using DART for assimilation in both the atmosphere and ocean, we really want to keep the various cores in-sync with respect to restart I/O (as well as other aspects of the models).
> 
> Unless we hear otherwise, I think that the ocean model would like to move to one restart frame per file with the time stamp in the filename. In that, we would like to follow your lead on the atmosphere side.
> 
> Would you all be open to the following? 1) supplementing the change in how we write restarts with the writing of a text file that points to the last restart written and 2) add the ability (within frameworks) to read this string at init in order to grab to latest restart (if that option is chosen in the namelist).
> 
> As Mark indicated, we are pressing to do quasi-production ocean runs. Getting this change implemented across all MPAS cores is high on our list since it will make our lives much easier. As such, we would be happy to help.
> 
> Cheers,
> Todd
> 
> 
> On Oct 25, 2011, at 1:13 PM, Jones, Philip W wrote:
> 
>> 
>> Folks,
>> 
>> I think I mentioned before, but...
>> 
>> On 10/25/11 12:48 PM, "Mark Petersen" <mpetersen at lanl.gov> wrote:
>> One way to do this is to write the name of the restart file to a text file
>> named latest_restart whenever a restart file is written.  
>> 
>> ...is the way that CCSM/CESM handles differently named restarts that still enable automatic queue resubmission.  They call it a pointer file and we have a flag in POP that specifies whether to read the filename from the pointer file or not.
>> 
>> Phil
>> 
>> 
>> ---
>> Correspondence/TSPA/DUSA EARTH
>> ------------------------------------------------------------
>> Philip Jones                                pwjones at lanl.gov
>> Climate, Ocean and Sea Ice Modeling
>> Los Alamos National Laboratory
>> T-3 MS B216                                 Ph: 505-500-2699
>> PO Box 1663                                Fax: 505-665-5926
>> Los Alamos, NM 87545-1663
>> 
>> 
>> 
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