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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