Parallel with openmpi

Overview

Teaching: 5 min min
Exercises: 0 min

Questions

• How to run parallel with openmpi in Palmetto

Objectives

First download and configure gnu hello

Request a compute node with 16 mpiprocs:

$ qsub -l select=1:ncpus=16:mpiprocs=16:mem=62gb:interconnect=fdr,walltime=3:00:00

Download and compile gnu-hello program:

$ wget https://ftp.gnu.org/gnu/hello/hello-2.10.tar.gz
$ tar -xvf hello-2.10.tar.gz
$ cd hello-2.10
$ ./configure
$ make

The hello binary file is created

Request an openmpi modules then run using mpiexec or mpirin:

$ module load openmpi/3.1.4-gcc/8.3.1-ucx
$ mpiexec -np 16 hello
OR
$ mpirun -np 16 hello

Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!
Hello, world!

Key Points

• parallel, openmpi