MPI_T_PVAR_WRITE(3)

💅 MPI_T_PVAR_WRITE(3) — like, the Open MPI manual page, bestie 💅

okay so this is the MPI_T_pvar_write(3) page from Open MPI, and honestly? it's giving "tiny function, big responsibility." it writes a performance variable's value. that's it. that's the whole vibe. let's get into it 🫶

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✨ NAME ✨

MPI_T_pvar_write — write the value of a control variable ✍️

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🌸 SYNTAX 🌸

💻 C Syntax

lowkey the easiest part, here's the whole thing verbatim, don't @ me:

#include <mpi.h>

int MPI_T_pvar_write(MPI_T_pvar_session session, MPI_T_pvar_handle handle, const void *buf)

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🎀 INPUT PARAMETERS 🎀

• session — the performance experiment session. like, the lil context this whole thing lives in 🧪
• handle — the performance variable handle. your little ticket to the variable u wanna touch 🎟️
• buf — the initial address of the storage location for the variable value. aka where the value u want to write is chillin' 📦

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🦋 DESCRIPTION 🦋

so MPI_T_pvar_write attempts to set the value of the performance variable identified by the handle in handle, inside the session in session. the value u wanna write? that comes from buf. ✨

important bestie note 🚨 the caller (that's u) must ensure the buffer in buf is large enough to hold the entire value of the performance variable. no cap, if it's too small that's on u. the function is not gonna magically resize it, it's not your mom 😭

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💀 ERRORS 💀

MPI_T_pvar_write will fail if any of these happen, and yes it will absolutely let u know:

• MPI_T_ERR_NOT_INITIALIZED — the MPI Tools interface is not initialized 🙈 (u gotta warm it up first, smh)
• MPI_T_ERR_INVALID_HANDLE — the handle is invalid or not associated with the session. it's giving "wrong group chat" energy 💀
• MPI_T_ERR_INVALID_SESSION — the session argument is not a valid session. bestie that's not even a real session 😭
• MPI_T_ERR_PVAR_NO_WRITE — the variable cannot be written. read-only icon behavior, respect it 👑

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🔥 SEE ALSO 🔥

• MPI_T_pvar_handle_alloc
• MPI_T_pvar_get_info
• MPI_T_pvar_session_create

go read those next, they're the supporting cast and they ate too 💅

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👑 COPYRIGHT 👑

2003-2026, The Open MPI Community — iconic, legendary, protecting the code since 2003 🌈

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and that's the whole page, bestie! written with love, dated Sep 11, 2026, and signed off by the Open MPI girlies at MPI_T_PVAR_WRITE(3) 💖✨🎀