[MITgcm-support] strange mpi results (using mpi?)

[Patrick Heimbach]

Michael,

in the runtime parameter file 'eedata'
add the line
 usingMPI = .TRUE.

and the white part of the world will look rose.

-p.

Quoting "m. r. schaferkotter" <schaferk at bellsouth.net>:

> greetings;
> 
> after running a successful lock exchange problem in serial mode, i 
> decided to run as mpi
> on lintel with pgi5.2, mpich-1.2.6 by modifying linux_ia32_pgf77+mpi, 
> which has no MPI defines in it, only
> some paths to mpich includes and mpich libs.
> 
> after a successful build, the program runs for the prescribed number of 
> timesteps (10- 300 in testing).
> i/ve compiled with 2,4, and 8 processors and a similar phenomenon 
> exists in all.
> 
> the program runs with mpirun, but i don/t see where the program been 
> told to use mpi. (below usingMPI is F).
> 
> (PID.TID 0000.0001) > nTx=1,       ! nTx - No. threads per process in X
> (PID.TID 0000.0001) > nTy=1        !  nTy - No. threads per process in Y
> (PID.TID 0000.0001)      nPx =    2 ; /* No. processes in X */
> (PID.TID 0000.0001)      nPy =    1 ; /* No. processes in Y */
> (PID.TID 0000.0001)      nSx =    1 ; /* No. tiles in X per process */
> (PID.TID 0000.0001)      nSy =    1 ; /* No. tiles in Y per process */
> (PID.TID 0000.0001)      sNx =  800 ; /* Tile size in X */
> (PID.TID 0000.0001)      sNy =    1 ; /* Tile size in Y */
> (PID.TID 0000.0001)       Nr =   51 ; /* No. levels in the vertical   */
> (PID.TID 0000.0001)       nX = 1600 ; /* Total domain size in X ( = 
> nPx*nSx*sNx ) */
> (PID.TID 0000.0001)       nY =    1 ; /* Total domain size in Y ( = 
> nPy*nSy*sNy ) */
> (PID.TID 0000.0001)   nTiles =    1 ; /* Total no. tiles per process ( 
> = nSx*nSy ) */
> (PID.TID 0000.0001)   nProcs =    2 ; /* Total no. processes ( = 
> nPx*nPy ) */
> (PID.TID 0000.0001) nThreads =    1 ; /* Total no. threads per process 
> ( = nTx*nTy ) */
> (PID.TID 0000.0001) usingMPI =    F ; /* Flag used to control whether 
> MPI is in use */
> (PID.TID 0000.0001)                   /*  note: To execute a program 
> with MPI calls */
> (PID.TID 0000.0001)                   /*  it must be launched 
> appropriately e.g     */
> (PID.TID 0000.0001)                   /*  "mpirun -np 64 ......"        
>              */
> 
> when i view the output of the temperature (initial) i find that the 
> temperature looks ok,
> but there is a large white blank square at the bottom of the domain, in 
> tile 2 of a 4 processor run
> 
> where does one set usingMPI? what about the eedata namelist
> 
> &EEPARMS
>   nTx=1,       ! nTx - No. threads per process in X
>   nTy=1        !  nTy - No. threads per process in Y
>   &end
> 
> where are the instructions on getting mpi runs going?
> 
> m. r.
> 
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> 


--------------------------------------------------------
Patrick Heimbach   Massachusetts Institute of Technology
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http://www.mit.edu/~heimbach/                        USA