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A Beginner's Guide to Running MPI Programs on GCB

This guide provides simple steps to run MPI (Message Passing Interface) programs on the GCB system. Using PuTTY or a terminal, connect via SSH to gcb.fiu.edu with your username and password. The tutorial includes a "Hello World" example using two processors demonstrating message passing. You'll learn how to compile and run your MPI program with commands like `mpicc` and `mpirun`. Follow along with the code provided and understand how MPI initializes, sends, and receives messages, making parallel programming accessible to everyone.

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A Beginner's Guide to Running MPI Programs on GCB

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  1. Running on GCBpart1 By: Camilo Silva

  2. Simple steps to run MPI • Use putty or the terminal • SSH to gcb.fiu.edu • Loggin by providing your username and password

  3. You are in! • You should have a screen similar to this one:

  4. Time to program! /* "Hello World" example for 2 processors. Initially, both processors have status "I am alone!". Each sends out a "Hello World" to the other. Upon receiving each other's message, the status changes to what is received. */ #include "mpi.h" #include <stdio.h> int main(int argc, char** argv) { int MyProc, tag=0; char msg[12]="Hello World"; char msg_recpt[12]="I am alone!"; MPI_Status status; MPI_Init(&argc, &argv); MPI_Comm_rank(MPI_COMM_WORLD, &MyProc); printf("Process# %d started \n", MyProc); MPI_Barrier(MPI_COMM_WORLD); if (MyProc== 0) { printf("Proc#0: %s \n", msg_recpt) ; printf("Sendingmessage to Proc #1: %s \n", msg) ; MPI_Send(&msg, 12, MPI_CHAR, 1, tag, MPI_COMM_WORLD); MPI_Recv(&msg_recpt, 12, MPI_CHAR, 1, tag, MPI_COMM_WORLD, &status); printf("Receivedmessage from Proc #1: %s \n", msg_recpt) ; } else { printf("Proc#1: %s \n", msg_recpt) ; MPI_Recv(&msg_recpt, 12, MPI_CHAR, 0, tag, MPI_COMM_WORLD, &status); printf("Receivedmessage from Proc #0: %s \n", msg_recpt) ; printf("Sendingmessage to Proc #0: %s \n", msg) ; MPI_Send(&msg, 12, MPI_CHAR, 0, tag, MPI_COMM_WORLD); } MPI_Finalize(); } Using vi, pico, or nano, or your favorite text editor code the following program:

  5. What next? • Submit the following command in the terminal: PATH=/opt/mpich/gnu/bin:$PATH • That line will add mpich to your path

  6. One last step… • Before compiling and running you must sent the following command: • [username~]$lamboot –v Then, compile the program: • mpicc –o hello hello.c Finally run it: • mpirun –v –np 2 hello Check the man for details of the functions and parameters

  7. Results:

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