Enable Intel MPI

Intel MPI is available on the Amazon ParallelCluster AMIs for alinux2, centos7, rhel8, ubuntu2204, and ubuntu2004 values for the Image / Os setting.

By default, Open MPI is placed on the path. To enable Intel MPI instead of Open MPI, you must first load the Intel MPI module. Then, you need to install the latest version by using module load intelmpi. The exact name of the module changes with every update. To see which modules are available, run module avail. The output is as follows.

$ module avail
-----------------------------/usr/share/Modules/modulefiles --------------------------------
dot                            modules        
libfabric-aws/1.16.0~amzn3.0   null
module-git                     openmpi/4.1.4
module-info                    use.own

-----------------------------/opt/intel/mpi/2021.6.0/modulefiles ---------------------------
intelmpi

To load a module, run module load modulename. You can add this to the script used to run mpirun.

$ module load intelmpi

To see which modules are loaded, run module list.

$ module list
Currently Loaded Modulefiles:
  1) intelmpi

To verify that Intel MPI is enabled, run mpirun --version.

$ mpirun --version
Intel(R) MPI Library for Linux* OS, Version 2021.6 Build 20220227 (id: 28877f3f32)
Copyright 2003-2022, Intel Corporation.

After the Intel MPI module has been loaded, multiple paths are changed to use the Intel MPI tools. To run code that was compiled by the Intel MPI tools, load the Intel MPI module first.