[nandiganavishal]

Dear Foamers,

I have installed OF 2.4 in my cluster and am trying to run icoFoam in parallel. However, I get the following error message.

--> FOAM FATAL ERROR: 
bool IPstream::init(int& argc, char**& argv) : attempt to run parallel on 1 processor


--> FOAM FATAL ERROR: 
bool IPstream::init(int& argc, char**& argv) : attempt to run parallel on 1 processor

    From function UPstream::init(int& argc, char**& argv)
    in file UPstream.C at line 79.


    From function UPstream::init(int& argc, char**& argv)
    in file UPstream.C at line 79.

FOAM aborting


--> FOAM FATAL ERROR: 
bool IPstream::init(int& argc, char**& argv) : attempt to run parallel on 1 processor

    From function UPstream::init(int& argc, char**& argv)
FOAM aborting


    in file UPstream.C at line 79.

FOAM aborting


--> FOAM FATAL ERROR: 
bool IPstream::init(int& argc, char**& argv) : attempt to run parallel on 1 processor

    From function UPstream::init(int& argc, char**& argv)
    in file UPstream.C at line 79.

FOAM aborting

#0  #0  #0  #0  Foam::error::printStack(Foam::Ostream&)Foam::error::printStack(Foam::Ostream&)Foam::error::printStack(Foam::Ostream&)Foam::error::printStack(Foam::Ostream&)--------------------------------------------------------------------------
An MPI process has executed an operation involving a call to the
"fork()" system call to create a child process.  Open MPI is currently
operating in a condition that could result in memory corruption or
other system errors; your MPI job may hang, crash, or produce silent
data corruption.  The use of fork() (or system() or other calls that
create child processes) is strongly discouraged.  

The process that invoked fork was:

  Local host:          taub098 (PID 19185)
  MPI_COMM_WORLD rank: 0

If you are *absolutely sure* that your application will successfully
and correctly survive a call to fork(), you may disable this warning
by setting the mpi_warn_on_fork MCA parameter to 0.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
An MPI process has executed an operation involving a call to the
"fork()" system call to create a child process.  Open MPI is currently
operating in a condition that could result in memory corruption or
other system errors; your MPI job may hang, crash, or produce silent
data corruption.  The use of fork() (or system() or other calls that
create child processes) is strongly discouraged.  

The process that invoked fork was:

  Local host:          taub098 (PID 19183)
  MPI_COMM_WORLD rank: 0

If you are *absolutely sure* that your application will successfully
and correctly survive a call to fork(), you may disable this warning
by setting the mpi_warn_on_fork MCA parameter to 0.

NOTE: This is how my batch script looks.

#PBS -q cse
#PBS -l nodes=1:ppn=4
#PBS -l walltime=00:01:00
#PBS -j oe
#PBS -o dc_0V
#PBS -N dc_0 
cd ${PBS_O_WORKDIR}

module load mvapich2/1.6-gcc+ifort

#blockMesh
#decomposePar
mpiexec -np 4 icoFoam -parallel

Please let me know what is the source of this error and how to correct it.

Thanks

Regards,
Vishal

[wyldckat]

Quick answer: You need to check the options that mpiexec needs for working, because the problem seems to be that the "-parallel" argument was not delivered to icoFoam for using. You need to talk with the system administrator of your cluster and/or check the documentation of mvapich2 that you're using.

For example:

mpiexec --help

[nandiganavishal]

Thanks, Bruno for the reply. I was able to figure out the solution to the problem by loading a different module in the batch script.

module load openmpi/1.8.4-gcc-4.9.2

Thanks

Regards,
Vishal