thank u for your reply .... can you please tell me what is the reason? it is my first time running a mpi .... 

i compiled a program with cpp which tells to use :

export           USE_MPI=on            # distributed-memory parallelism

 export        USE_MPIF90=on              # compile with mpif90 script

 export         which_MPI=mpich         # compile with MPICH library

#export         which_MPI=mpich2        # compile with MPICH2 library

# export         which_MPI=openmpi       # compile with OpenMPI library

#export        USE_OpenMP=on            # shared-memory parallelism

# export              FORT=ifort

export              FORT=gfortran

#export              FORT=pgi

 #export         USE_DEBUG=              # use Fortran debugging flags

 export         USE_LARGE=on            # activate 64-bit compilation

#export       USE_NETCDF4=on            # compile with NetCDF-4 library

#export   USE_PARALLEL_IO=on            # Parallel I/O with Netcdf-4/HDF5

#export       USE_MY_LIBS=on            # use my library paths below

and then it gives me a file(coawstM) and the manual tells me to run that file in this way :

mpirun -np 2 ./coawstM  swan_only.in

what will be the reason? is it because mpich was not compiled truely or the coawstM is not working for a reason?

thank you

On Sat, Nov 29, 2014 at 6:07 AM, Junchao Zhang <jczhang@mcs.anl.gov> wrote:

As indicated by the message, you passed an invalid communicator to MPI_Comm_rank() in your program.

--Junchao Zhang

On Sat, Nov 29, 2014 at 4:32 AM, نازنین <nazanin.mirshokraei@gmail.com> wrote:

hi does any one know about this error :

Fatal error in PMPI_Comm_rank: Invalid communicator, error stack:

PMPI_Comm_rank(108): MPI_Comm_rank(comm=0x0, rank=0x7fff24a405bc) failed

PMPI_Comm_rank(66).: Invalid communicator

Fatal error in PMPI_Comm_rank: Invalid communicator, error stack:

PMPI_Comm_rank(108): MPI_Comm_rank(comm=0x0, rank=0x7fff63e1598c) failed

PMPI_Comm_rank(66).: Invalid communicator

it is when i run mpich like :

mpirun -np 2 ./coawstM   swan_only.in

i don't know if this is a problem in my executable file (coawstM) or this is from mpich or any other hardware issues or anything else 

thank you for your help

nazi

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