MPI_T_FINALIZE(3)

💖 MPI_T_FINALIZE — the Open MPI bestie 💖

okay so this is MPI_T_FINALIZE(3) from the Open MPI manual, section 3. grab a snack, we're closing tabs on the MPI tool interface. 🎀

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🌸 NAME 🌸

MPI_T_finalize — bestie, it's time to Finalize the MPI tool information interface ✨

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🦋 SYNTAX 🦋

C Syntax

#include <mpi.h>

int MPI_T_finalize(void)

that's it. no arguments. no drama. just vibes and a return code. 💅

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👑 DESCRIPTION 👑

So MPI_T_finalize() finalizes the MPI tool information interface, and the one rule you literally cannot skip is this: it must be called the same number of times as MPI_T_init_thread() by the end of execution. Matching set. Like friendship bracelets. 🫶

Here's the tea tho — calls to MPI tool functions are allowed at any point in execution as long as both of these are true:

• MPI_T_init_thread() has been called at least once, and
• the number of calls to MPI_T_init_thread() is greater than the number of calls to MPI_T_finalize().

And if at any point in execution the number of calls to MPI_T_finalize() equals the number of calls to MPI_T_init_thread()? 😭 the MPI tool interface will no longer be available until another call to MPI_T_init_thread(). it's giving "you left the group chat, you don't get the messages". the door isn't locked, it's just closed. 🔥

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⭐ NOTES ⭐

Before the end of execution, the number of calls to MPI_T_init_thread() and MPI_T_finalize must be the same. that's the whole note. balance. symmetry. iconic. 🌈

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💀 ERRORS 💀

MPI_T_finalize will fail if:

• MPI_T_ERR_NOT_INITIALIZED: The MPI Tools interface not initialized 🙈

like... you can't close a book you never opened, bestie.

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See also:

• MPI_T_init_thread <#mpi-t-init-thread>

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🎀 Copyright 🎀

2003-2026, The Open MPI Community

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and that's the page! 💖 written up as part of the Open MPI docs, this version dated Sep 10, 2026, and it's MPI_T_FINALIZE(3) forever and ever. slay responsibly, count your init/finalize pairs, and don't forget to MPI_T_init_thread before you come for MPI_T_finalize. periodt. ✨🦋💅