MPI_T_PVAR_GET_NUM(3)

💖 MPI_T_PVAR_GET_NUM 💖

okay bestie, so this one lives in the Open MPI manual, section 3, and it's called MPI_T_pvar_get_num — say that five times fast, I dare you. It's literally just asking how many performance variables exist right now. That's the whole vibe. No cap. 🎀

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✨ NAME ✨

MPI_T_pvar_get_num — Query the number of performance variables 🔢

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🌸 SYNTAX 🌸

C Syntax

#include <mpi.h>

int MPI_T_pvar_get_num(int *num_pvar)

like, that's it. one function, one pointer, one dream. 💅

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🦋 OUTPUT PARAMETERS 🦋

• num_pvar — the current number of performance variables. that's the count as it stands right this second, and it lands in whatever int you point at. 🫶

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👑 DESCRIPTION 👑

okay so here's the tea: MPI_T_pvar_get_num is the little function you call when you need to know the current number of performance variables. it's giving census-taker energy for your MPI tools. 📋✨

and here's the important part, so listen up: the number of performance variables may increase throughout the execution of the process, but it will never decrease. so it only ever grows — no takebacks, no shrinking, no "jk bestie". it's a one-way street. 🚀

fr fr, this means a count you grabbed earlier might be stale later, but it will never be too big. iconic behaviour honestly. 💖

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💀 ERRORS 💀

MPI_T_pvar_get_num will fail if:

• MPI_T_ERR_NOT_INITIALIZED — the MPI Tools interface not initialized. so like... you have to actually turn it on first, bestie. you can't just walk in. 😭

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🍓 SEE ALSO 🍓

(the original page doesn't list any SEE ALSO entries, so we're just gonna sit here and vibe together) 🌈

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Copyright 2003-2026, The Open MPI Community

and that's the whole page, babes — this one was documented back on Sep 10, 2026, from the Open MPI crew, and it's MPI_T_PVAR_GET_NUM(3) in the manuals. go forth and count your performance variables, you absolute main character. 👑💜🧚