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

[m. r. schaferkotter]

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.