[MITgcm-support] No. of processes not equal to nPx*nPy

[Gus Correa]

Hi Jean-Michel

I keep a bunch of SIZE_Np.h_mpi
(where N is the number of processors to use).
My SIZE.h is just a soft link to that particular number
of processors I want to use.
This is very convenient when you have to accommodate with
other user jobs in a cluster with a batch queue,
shrinking or expanding the number of requested processes
depending on their availability and queue status.

The new genmake2 scheme will break this, right?
What is the upside of the new genmake2 scheme?
Can it be reverted to the old one?

Of course I can rename the files SIZE_Np.h_mpi with a
different suffix.
However, if the decision to use different include files
is based on slightly different file names,
and is hidden inside genmake2,
this may trick users, as it may have done to Nico.
Including a single SIZE.h with the standard file name
avoids confusion.

Just a suggestion.

Thank you,
Gus Correa
---------------------------------------------------------------------
Gustavo Correa
Lamont-Doherty Earth Observatory - Columbia University
Palisades, NY, 10964-8000 - USA
---------------------------------------------------------------------


Jean-Michel Campin wrote:
> Hi Nico,
> 
> Can you check which "SIZE.h" is in your directory where you 
> build the executable ?
> 
> I realized that I made a modification to genmake2 
> (and still not sure if this was a good idea) which could explain
> the changes you see now:
> with the option "-mpi", genmake2 is now linking *_mpi files from all
> our "mods-dir" and then renames the link without the suffix "_mpi".
> If you keep a "SIZE.h_mpi" in your mods-dir, it was ignored before
> but is now linked before "SIZE.h". You can just remove "SIZE.h_mpi"
> and everything will work as they used to.
> 
> Thanks,
> Jean-Michel
> 
> On Tue, Apr 21, 2009 at 12:51:50PM -0400, Nico Wienders wrote:
>>
>>
>>
>>
>> MITgcmers,
>>
>> I got a funny one this morning:
>>
>> (PID.TID 0003.0001) *** ERROR *** S/R EEBOOT_MINIMAL: No. of processes  
>> not equal to nPx*nPy    12     2
>>
>> In this message i believe the first column (12)  indicate the number of 
>> procs i request in my mpi command
>> The second column (2) is on how many processors the code recognizes it  
>> should run. Correct?
>>
>> But my SIZE.h is:
>>
>>     &           sNx =  150,
>>     &           sNy =  150,
>>     &           OLx =   3,
>>     &           OLy =   3,
>>     &           nSx =   1,
>>     &           nSy =   1,
>>     &           nPx =   3,
>>     &           nPy =   4,
>>     &           Nx  = sNx*nSx*nPx,
>>     &           Ny  = sNy*nSy*nPy,
>>     &           Nr  =   140)
>>
>>
>>
>> I do not understand. These configurations were all working fine in the  
>> past. Thank you.
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