[MITgcm-support] nPx vs. nPy

[taimaz.bahadory]

Yes I always recompile the code when changing packages and sizes in /code
directory.
I can run the code now using 100 processors.
Thanks


On Fri, Jul 27, 2012 at 12:56 PM, Gus Correa <gus at ldeo.columbia.edu> wrote:

> Hi Taimaz
>
> Another detail is that you need to recompile the code
> whenever you change the number of processors and subgrid sizes
> in SIZE.h, as most memory is allocated statically.
> Well, at least it used to be this way.
> Did you recompile?
>
> Gus Correa
>
>
> On 07/26/2012 05:38 PM, taimaz.bahadory wrote:
>
>> My total grid is 130x100, which matches a Nx=13x1x10 and Ny=100x1x1.
>> As I said, when I play with y-direction (i.e. changing nPy to from 1 to
>> 10 and sNy from 100 to 10, while nPx is 1 and sNx is 130), everything
>> works fine. The problem arises when I try to increase the nPx to
>> something else than 1, also I'm careful of the total product to match
>> the total grid size mentioned in data file.
>>
>>
>>
>> On Thu, Jul 26, 2012 at 6:21 PM, Gus Correa <gus at ldeo.columbia.edu
>> <mailto:gus at ldeo.columbia.edu>**> wrote:
>>
>>     Hi Taimaz
>>
>>     Nx, Ny, Nr are the number of points in your [full] domain,
>>     which should match the domain size in your initial condtion files,
>>     etc, so they should be fixed for each experiment you run.
>>     If there is no match the run fails.
>>
>>     Given Nx, you need to find out the the values
>>     nPx, and sNx such that their product is Nx
>>     [assuming nSx is 1, i.e. you're not using threads/OpenMP].
>>     Likewise for nPy, sNy, etc.
>>
>>     Note that in SIZE.h is defined as
>>     Nx  = sNx*nSx*nPx,
>>     and Ny  = sNy*nSy*nPy.
>>     Hence, it is you need to choose the
>>     right factors to get the expected products Nx and Ny.
>>
>>     I hope this helps,
>>     Gus Correa
>>
>>
>>     On 07/26/2012 03:56 PM, taimaz.bahadory wrote:
>>
>>         Attached
>>
>>
>>         On Thu, Jul 26, 2012 at 5:17 PM, Chris Horvat
>>         <horvat at fas.harvard.edu <mailto:horvat at fas.harvard.edu**>
>>         <mailto:horvat at fas.harvard.edu
>>
>>         <mailto:horvat at fas.harvard.edu**>__>> wrote:
>>
>>              Taimaz,
>>
>>              Could you include your SIZE.h file so we can see what the
>>         other set
>>              parameters are?
>>
>>              Chris Horvat
>>
>>
>>              On Thu, Jul 26, 2012 at 3:45 PM, taimaz.bahadory
>>         <taimaz.bahadory at mun.ca <mailto:taimaz.bahadory at mun.ca**>
>>         <mailto:taimaz.bahadory at mun.ca
>>
>>         <mailto:taimaz.bahadory at mun.ca**>__>> wrote:
>>
>>                  Hi;
>>
>>                  I have configures a code to run my topography file using
>>                  parallel system (mpi). Everything works fine when I set
>>         nPy=10
>>                  (or anything), but the errors come out when I try to
>>         break the
>>                  x-direction to different sections, i.e. increasing nPx to
>>                  something more than 1.
>>                  summary:
>>
>>                    * nPx = 1; nPy = 10 => works fine
>>                    * nPx = 10; nPy = 1 => fails
>>
>>
>>                  Is there any limitation on the x-axis?
>>
>>                  ______________________________**___________________
>>
>>                  MITgcm-support mailing list
>>         MITgcm-support at mitgcm.org <mailto:MITgcm-support at mitgcm.**org<MITgcm-support at mitgcm.org>
>> >
>>         <mailto:MITgcm-support at mitgcm.**__org
>>         <mailto:MITgcm-support at mitgcm.**org <MITgcm-support at mitgcm.org>>>
>>
>>         http://mitgcm.org/mailman/__**listinfo/mitgcm-support<http://mitgcm.org/mailman/__listinfo/mitgcm-support>
>>         <http://mitgcm.org/mailman/**listinfo/mitgcm-support<http://mitgcm.org/mailman/listinfo/mitgcm-support>
>> >
>>
>>
>>
>>              ______________________________**___________________
>>
>>              MITgcm-support mailing list
>>         MITgcm-support at mitgcm.org <mailto:MITgcm-support at mitgcm.**org<MITgcm-support at mitgcm.org>
>> >
>>         <mailto:MITgcm-support at mitgcm.**__org
>>         <mailto:MITgcm-support at mitgcm.**org <MITgcm-support at mitgcm.org>>>
>>
>>         http://mitgcm.org/mailman/__**listinfo/mitgcm-support<http://mitgcm.org/mailman/__listinfo/mitgcm-support>
>>         <http://mitgcm.org/mailman/**listinfo/mitgcm-support<http://mitgcm.org/mailman/listinfo/mitgcm-support>
>> >
>>
>>
>>
>>
>>         ______________________________**___________________
>>
>>         MITgcm-support mailing list
>>         MITgcm-support at mitgcm.org <mailto:MITgcm-support at mitgcm.**org<MITgcm-support at mitgcm.org>
>> >
>>         http://mitgcm.org/mailman/__**listinfo/mitgcm-support<http://mitgcm.org/mailman/__listinfo/mitgcm-support>
>>         <http://mitgcm.org/mailman/**listinfo/mitgcm-support<http://mitgcm.org/mailman/listinfo/mitgcm-support>
>> >
>>
>>
>>
>>     ______________________________**___________________
>>
>>     MITgcm-support mailing list
>>     MITgcm-support at mitgcm.org <mailto:MITgcm-support at mitgcm.**org<MITgcm-support at mitgcm.org>
>> >
>>     http://mitgcm.org/mailman/__**listinfo/mitgcm-support<http://mitgcm.org/mailman/__listinfo/mitgcm-support>
>>
>>     <http://mitgcm.org/mailman/**listinfo/mitgcm-support<http://mitgcm.org/mailman/listinfo/mitgcm-support>
>> >
>>
>>
>>
>>
>> ______________________________**_________________
>> MITgcm-support mailing list
>> MITgcm-support at mitgcm.org
>> http://mitgcm.org/mailman/**listinfo/mitgcm-support<http://mitgcm.org/mailman/listinfo/mitgcm-support>
>>
>
>
> ______________________________**_________________
> MITgcm-support mailing list
> MITgcm-support at mitgcm.org
> http://mitgcm.org/mailman/**listinfo/mitgcm-support<http://mitgcm.org/mailman/listinfo/mitgcm-support>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mitgcm.org/pipermail/mitgcm-support/attachments/20120727/ed3924c5/attachment-0001.htm>