Here you’ll learn how to build your own cluster that uses MPI library to execute programs in parallel mode.
Cluster
Using our cluster created Jcluster.
We need to install MPI (Message Pasing Interface).
MPI
MPI is a standardized and portable message-passing system.
sudo apt-get install mpich
MPI is useful in Distributed Computing Systems to do parallel programs.
Example
On /home/juser/forShare, we must shared mpi files.
Creating a
nodesfilefile with content:Jnode01:2 # this node use 2 processors Jnode02:3 # this node use 3 processors Jnode03:4 # this node use 4 processors Jnode04 # this node use 1 processors Jnode05Then, we write the
helloworldMPI.cprogram (we use C language):
#include <mpi.h>
#include <stdio.h>
int main(int argc, char** argv) {
// Initialize the MPI environment
MPI_Init(NULL, NULL);
// Get the number of processes
int world_size, world_rank, name_len;
MPI_Comm_size(MPI_COMM_WORLD, &world_size);
// Get the rank of the process
MPI_Comm_rank(MPI_COMM_WORLD, &world_rank);
// Get the name of the processor
char processor_name[MPI_MAX_PROCESSOR_NAME];
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();
}
Then, compile it:
mpicc helloworldMPI.c -o mpihelloAnd run on
Jmaster:mpiexec -np 3 -f /path/to/nodesfile ./mpihello
