OPEN-MPI(7)

💅 OPEN-MPI(7) 💅

ok so this is the open-mpi(7) manual page, bestie — the general-information one. no commands, no flags, just the whole vibe of what Open MPI is. sit down, hydrate, let's go 🫶

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NAME 🌸

Open MPI — general information. that's it, that's the name. iconic brevity.

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OPEN MPI 👑

so. Open MPI is an open source implementation of MPI — that's the message-passing interface — which is the industry-standard specification for writing message-passing programs. literally the blueprint everyone agreed on. ✨

and message passing itself? it's a programming model that hands you, the programmer, explicit control over interprocess communication. no vibes-based guessing about who's talking to whom — you say it, it happens 💅

the MPI specification was cooked up by the MPI Forum — a whole group chat 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
• portable

the outcome — known as the MPI Standard — was first published in 1993, and its most recent version (MPI-4.0) was published in June 2021. and here's the slay: Open MPI includes all MPI 3.1-compliant routines. all of them. no crumbs left. 😭🔥

for more info about Open MPI, see https://www.open-mpi.org the MPI standards themselves live at https://www.mpi-forum.org

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MAN PAGE SYNTAX 🎀

ok this part is lowkey satisfying to know. man pages for Open MPI and Open MPI I/O routines are named according to C syntax, meaning:

• they begin with the prefix MPI_ — all in uppercase
• the first letter following the MPI_ prefix is also uppercase
• the rest of the letters in the routine are all lowercase

example, because examples are everything: MPI_Comm_get_attr

see? MPI_ → C → omm_get_attr. pattern recognition ate, ngl 🦋

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ENVIRONMENT 🧚

want to fine-tune your Open MPI environment? you've got exactly two lanes, bestie:

• use arguments to the mpirun or mpiexec commands, or
• use MCA parameters

for more information on arguments, see the mpirun(1) man page.

for a complete listing of MCA parameters and their descriptions, literally just issue this command:

ompi_info --all

see ompi_info(1) for more information. 🫶

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ERRORS 🙈

see MPI Errors for details about error values.

SEE ALSO 🌈

ok the friend group:

• MPI_T
• mpirun(1)
• mpiexec(1)
• ompi_info(1)

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COPYRIGHT 💜

2003-2026, The Open MPI Community

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and that's the whole page, babes 🍓 thanks for reading all the way to the footer — which, for the record, is Sep 11, 2026, from the Open MPI crew. mwah, go write something portable 💅✨