> /bin/uname -a is a good program to try first.
> if that doesn't work, google for an mpi helloworld program that spits
> out each processors rank.
Here is a mpi helloworld that also prints out the DISPLAY environment
variable for each process:
/* C Example */
#include <stdio.h>
#include <mpi.h>
#include <stdlib.h>
int main (int argc, char *argv[])
{
int rank, size;
MPI_Init (&argc, &argv); /* starts MPI */
MPI_Comm_rank (MPI_COMM_WORLD, &rank); /* get current process id */
MPI_Comm_size (MPI_COMM_WORLD, &size); /* get number of processes */
printf( "Hello world from process %d of %d. DISPLAY is: %s\n",
rank, size, getenv("DISPLAY") );
MPI_Finalize();
return 0;
}
Result:
mpirun -np 2 ./helloworld
Hello world from process 1 of 2. DISPLAY is: (null)
Hello world from process 0 of 2. DISPLAY is: (null)
mpirun -np 2 -x DISPLAY ./helloworld
Hello world from process 0 of 2. DISPLAY is: :0.0
Hello world from process 1 of 2. DISPLAY is: :0.0
Pat
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