---
name: "Open-MPI"
section: "7"
platform: "linux"
package: "openmpi"
version: "5.0.11-1"
release: "Arch Linux 2026-11-01"
platforms: ["linux"]
url: "https://new.carta.tech/Open-MPI"
---

# Open-MPI(7)

Open MPI - General information

## OPEN MPI

Open MPI is an open source implementation of MPI (message-passing interface), the industry-standard specification for writing message-passing programs. Message passing is a programming model that gives the programmer explicit control over interprocess communication.

The MPI specification was developed by the MPI Forum, a group of software developers, computer vendors, academics, and computer-science researchers whose goal was to develop a standard for writing message-passing programs that would be efficient, flexible, and portable.

The outcome, known as the MPI Standard, was first published in 1993; its most recent version (MPI-4.0) was published in June 2021. Open MPI includes all MPI 3.1-compliant routines.

For more information about Open MPI, see *https://www.open-mpi.org*.

The MPI standards are available at *https://www.mpi-forum.org*.

## MAN PAGE SYNTAX

Man pages for Open MPI and Open MPI I/O routines are named according to C syntax, that is, they begin with the prefix **MPI\_**, all in uppercase, and the first letter following the **MPI\_** prefix is also uppercase. The rest of the letters in the routine are all lowercase, for example, *MPI\_Comm\_get\_attr*.

## ENVIRONMENT

To fine-tune your Open MPI environment, you can either use arguments to the *mpirun* or *mpiexec* commands, or you can use MCA parameters.

For more information on arguments, see the *[mpirun(1)](/mpirun/1.md)* man page.

For a complete listing of MCA parameters and their descriptions, issue the command **ompi\_info --all**.  See *[ompi\_info(1)](/ompi_info/1.md)* for more information.

## ERRORS

See *MPI Errors* for details about error values.

**SEE ALSO:**

*MPI\_T* *[mpirun(1)](/mpirun/1.md)* *[mpiexec(1)](/mpiexec/1.md)* *[ompi\_info(1)](/ompi_info/1.md)*

## COPYRIGHT

2003-2026, The Open MPI Community