[mpich-discuss] MPI_Comm_size

[xiao zhang]

HI~ Everyone: i have a little doubt about the funtion:
MPI_Comm_size
If I call it like:

include 'mpif.h'
integer :: ierr
call MPI_Init(ierr)
call MPI_Comm_size(MPI_COMM_WORLD,*mgroupsize*,ierr)

Then I use 8 processors to run the program, the return value of *mgroupsize
*should be 8. Is that right?
If it is right, the return value for me is just 1.   What would be the
possible problem?

 I am really new to this and thank you very much
                                   Xia
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