mpiexec.hydra command not found

Introduction

When you run more command in linux terminal / console, you get the following error message

mpiexec.hydra: command not found

or when using sudo you get the following error message

sudo: mpiexec.hydra: command not found

Solutions to mpiexec.hydra: command not found

How To Fix mpiexec.hydra: command not found in Ubuntu / Debian / Kali Linux / Raspbian

In Ubuntu mpiexec.hydra is provided by mpich package.

mpich is:

MPICH is a high-performance and widely portable implementation of the MPI-3.1 standard from the Argonne National Laboratory. It efficiently supports different computation and communication platforms including commodity clusters, SMPs, massively parallel systems, and high-speed networks. This release has all MPI 3.1 functions and features required by the standard with the exception of support for the “external32” portable I/O format and user-defined data representations for I/O.

This package includes the program binaries necessary to run MPICH programs.

To fix this problem, we can install more using the command below.

sudo apt-get -y install mpich

This command might take some time to finish depending on your machine internet connection.

You can also use apt command to install mpich.

sudo apt -y install mpich

Or if you have aptitude installed you can use the following command.

sudo aptitude install mpich

Summary

In this tutorial we learn how to fix mpiexec.hydra command not found error in Ubuntu / Debian / Kali Linux or Raspbian distribution.