MPI hello world program return error result

[xiongjie494]

I started a cluster of 2 nodes successfully. I try to run a MPI hello world program to check the cluster. But the result display that there are only master node is working in the cluster.

////////////////////////////////////////// //MPI_Hello.c //////////////////////////////////////////

include

include

int main(int argc, char\ argv) { // Initialize the MPI environment MPI_Init(NULL, NULL);

// Get the number of processes
int world_size;
MPI_Comm_size(MPI_COMM_WORLD, &world_size);

// Get the rank of the process
int world_rank;
MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);

// Get the name of the processor
char processor_name[MPI_MAX_PROCESSOR_NAME];
int name_len;
MPI_Get_processor_name(processor_name, &name_len);

// Print off a hello world message
printf("Hello world from processor %s, rank %d"
       " out of %d processors\n",
       processor_name, world_rank, world_size);

// Finalize the MPI environment.
MPI_Finalize();

}

$ mpicc MPI_Hello.c -o hello $ mpirun -np 2 ./hello

RESULTS: Hello world from processor master, rank 0 out of 1 processors Hello world from processor master, rank 0 out of 1 processors

It seams only master is in the cluster. I choose the NODE_IMAGE_ID = ami-6b211202, NODE_INSTANCE_TYPE = t2.micro, and put the config file in attachment.

I have no idea what happened. Please help me out. Thank you!

config.pdf

[vasisht]

Have you tried using the MPICH2 plugin? http://star.mit.edu/cluster/docs/0.93.3/plugins/mpich2.html

[xiongjie494]

No. I just use the OpenMPI.

[xiongjie494]

Thank you, vasisht. I try using MPICH2, it works! I got the right result.