MPI_T_PVAR_READ(3)

💖 MPI_T_PVAR_READ 💖

okay bestie, welcome to the Open MPI manual, section 3 — this is the page for MPI_T_pvar_read, and it's lowkey iconic because it's literally how you peek at a performance variable's value. no cap. 🫶

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✨ NAME ✨

MPI_T_pvar_read — read the value of a performance variable. that's it. that's the whole job. slay. 💅

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🌸 SYNTAX 🌸

C Syntax 🎀

#include <mpi.h>

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

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🦋 INPUT PARAMETERS 🦋

• session — the performance experiment session. it's giving "which experiment are we in". main character energy fr.
• handle — the performance variable handle. this is your lil VIP pass to the variable you wanna read. 👑
• buf — the initial address of the storage location for the variable value. so like, this is where the answer goes. it's the drop-off spot. 📦

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💜 DESCRIPTION 💜

so the way that MPI_T_pvar_read works is: it queries the value of a performance variable — the one identified by the handle you passed in handle, inside the session you passed in session. the result gets stored in the buffer that buf points to. periodt. ✨

⚠️ bestie listen — the caller must ensure that the buffer pointed to by buf is large enough to hold the entire value of the performance variable. not me stressing about buffer sizes. please. do the vibe check on your allocation first or it's gonna be a bad time. 😭💀

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🔥 ERRORS 🔥

MPI_T_pvar_read will fail if:

• MPI_T_ERR_NOT_INITIALIZED — the MPI Tools interface is not initialized. you gotta init first, babe. 🙈
• MPI_T_ERR_INVALID_HANDLE — the handle is invalid, or it's not associated with the session. mismatched. not the duo we thought. 💔
• MPI_T_ERR_INVALID_SESSION — the session argument is not a valid session. 🌧️

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🧚 SEE ALSO 🧚

• MPI_T_pvar_handle_alloc <#mpi-t-pvar-handle-alloc>
• MPI_T_pvar_get_info <#mpi-t-pvar-get-info>
• MPI_T_pvar_session_create <#mpi-t-pvar-session-create>

go read those too, iykyk. goblin-mode through the whole set, honestly. 🌈

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👑 COPYRIGHT 👑

2003-2026, The Open MPI Community

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and that's the whole page, bestie!! this was the Open MPI manual, section 3, dated Sep 10, 2026, page MPI_T_PVAR_READ(3) — courtesy of the Open MPI Community, 2003-2026. mwah. 💋 no cap, you're gonna read that variable like a pro. bye babe! 🎀💖✨🦋🌸🫶