MPI_GET_VERSION(3)

👑 MPI_Get_version — the vibe check on which MPI standard you're actually running 💅

okay so this one's from the Open MPI manual, section 3, and it's lowkey iconic: MPI_Get_version hands you back the version of the standard that the implementation you're currently talking to corresponds to. Not the library version, bestie — the standard version. iykyk. ✨

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🎀 SYNTAX 🎀

C Syntax

#include <mpi.h>

int MPI_Get_version(int *version, int *subversion)

Fortran Syntax

USE MPI
! or the older form: INCLUDE 'mpif.h'

MPI_GET_VERSION(VERSION, SUBVERSION, IERROR)
    INTEGER VERSION, SUBVERSION, IERROR

Fortran 2008 Syntax

USE mpi_f08

MPI_Get_version(version, subversion, ierror)
    INTEGER, INTENT(OUT) :: version, subversion
    INTEGER, OPTIONAL, INTENT(OUT) :: ierror

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📤 OUTPUT PARAMETERS 📤

• version — the major version number of the corresponding standard (an integer, bestie).
• subversion — the minor version number of the corresponding standard (also an integer).
• ierror — Fortran only, babes: the error status (integer).

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🌸 DESCRIPTION 🌸

So here's the tea ☕ — since Open MPI v5.0.10 is MPI-3.1 compliant (peep the Open MPI standards conformance page in the release notes if you want more deets on that), this function will return a version value of 3 and a subversion value of 1 for this release. No cap. 🫶

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⭐ NOTE ⭐

MPI_Get_version is one of the few functions that can be called before MPI_Init and after MPI_Finalize. main character energy honestly, it doesn't need the whole program to be up and running. 👑

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💀 ERRORS 💀

Almost all MPI routines return an error value; C routines as the return result of the function and Fortran routines in the last argument.

Before the error value is returned, the current MPI error handler associated with the communication object (e.g., communicator, window, file) is called. If no communication object is associated with the MPI call, then the call is considered attached to MPI_COMM_SELF and will call the associated MPI error handler. When MPI_COMM_SELF is not initialized (i.e., before MPI_Init/MPI_Init_thread, after MPI_Finalize, or when using the Sessions Model exclusively) the error raises the initial error handler. The initial error handler can be changed by calling MPI_Comm_set_errhandler on MPI_COMM_SELF when using the World model, or the mpi_initial_errhandler CLI argument to mpiexec or info key to MPI_Comm_spawn/MPI_Comm_spawn_multiple. If no other appropriate error handler has been set, then the MPI_ERRORS_RETURN error handler is called for MPI I/O functions and the MPI_ERRORS_ABORT error handler is called for all other MPI functions.

Open MPI includes three predefined error handlers that can be used:

• MPI_ERRORS_ARE_FATAL — causes the program to abort all connected MPI processes. 💀
• MPI_ERRORS_ABORT — an error handler that can be invoked on a communicator, window, file, or session. When called on a communicator, it acts as if MPI_Abort was called on that communicator. If called on a window or file, acts as if MPI_Abort was called on a communicator containing the group of processes in the corresponding window or file. If called on a session, aborts only the local process.
• MPI_ERRORS_RETURN — returns an error code to the application.

MPI applications can also implement their own error handlers by calling:

• MPI_Comm_create_errhandler then MPI_Comm_set_errhandler
• MPI_File_create_errhandler then MPI_File_set_errhandler
• MPI_Session_create_errhandler then MPI_Session_set_errhandler or at MPI_Session_init
• MPI_Win_create_errhandler then MPI_Win_set_errhandler

Note that MPI does not guarantee that an MPI program can continue past an error. like, fr fr, don't go assuming you can just keep vibing after an error. 🙈

See the MPI man page for a full list of MPI error codes.

See the Error Handling section of the MPI-3.1 standard for more information.

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📜 Copyright 📜

2003-2026, The Open MPI Community

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and that's the whole page, bestie 💜 this lil slice of the Open MPI manual was dated Sep 10, 2026 — go forth, call MPI_Get_version, and slay ✨🦋🎀