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Giorgos Mouch
Asked: 2020-05-08 03:24:46 +0800 CST

MPICH installation

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I searching on internet how to download the MPICH in my laptop, and something is going wrong... I don't know what is happening. I am using ubuntu 18.04. Someone know any good installation video, or doc to use and download it? I am trying to do the installation since 3 days and I can't... Sorry for the silly question

software-installation mpi

1 Answers

  1. 1. Install mpich from the default Ubuntu repositories.

    sudo apt install mpich

    2. Copy the below hello world C code into a new file named mpi_hello_world.c and save.

    #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;
    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();
}

    3. Change directories to the directory which contains mpi_hello_world.c, then compile and run the code with the following commands.

    mpicc mpi_hello_world.c -o hello-world  
mpirun -np 5 ./hello-world
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