[MITgcm-support] exch2 with lat lon grid

[Matthew Mazloff]

Hello

EXCH2 package works great!

Bringing me to my next question:

Is there a trick for using more than 999 cores? I assume setting nPy>999 is an issue since the mdsio routines have statements with:

         WRITE(dataFName,'(2A,I3.3,A,I3.3,A)')
     &              pfName(1:pIL),'.',iG,'.',jG,'.data'

Is there an easy fix (e.g. to ini_procs.F) for this issue?

Thanks!
Matt



On Dec 21, 2014, at 1:00 PM, Matthew Mazloff <mmazloff at ucsd.edu> wrote:

> Hi Patrick
> 
> I saw that but it seemed too simple -- glad to hear that works! So to confirm, there is no need to set any fancy topology files, the trick is just to set
> nPy =   Number of cores needed,
> 
> and then in data.exch2
>  W2_mapIO   = 1,
> so the code knows it was nPy that was set to "Number of cores needed"
> and then:
> dimsFacets = NX, NY,
> so it can rebuild the grid.
> 
> and that is it?
> 
> I'll give it a try -- sounds great!
> 
> Thanks
> Matt
> 
> 
> 
> 
> 
> 
> On Dec 21, 2014, at 12:09 PM, Patrick Heimbach <heimbach at mit.edu> wrote:
> 
>> Hi Matt,
>> 
>> yes, a simple example is the parallel version of verification/global_ocean.90x40x15/
>> i.e. take a look at
>> code/SIZE.h_mpi
>> input/data.exch2.mpi
>> 
>> p.
>> 
>> On Dec 21, 2014, at 2:54 PM, Matthew Mazloff <mmazloff at ucsd.edu> wrote:
>> 
>>> Hello
>>> 
>>> I have a lat-lon grid with a good number of blank tiles. Is it possible to use exch2 such that I can request fewer cores?  Is there an example of how to implement this for a simple grid? 
>>> 
>>> Thanks!
>>> Matt
>>> 
>>> 
>>> _______________________________________________
>>> MITgcm-support mailing list
>>> MITgcm-support at mitgcm.org
>>> http://mitgcm.org/mailman/listinfo/mitgcm-support
>> 
>> 
>> ---
>> Patrick Heimbach | heimbach at mit.edu | http://www.mit.edu/~heimbach
>> MIT | EAPS 54-1420 | 77 Massachusetts Ave | Cambridge MA 02139 USA
>> FON +1-617-253-5259 | FAX +1-617-253-4464 | SKYPE patrick.heimbach
>> 
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> 
> 
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