_NUM_PES(3)

💖 _NUM_PES(3) — Open MPI, bestie edition 💖

okay so real talk, this is <pink>_NUM_PES(3)</pink> from the Open MPI manual set, and it's genuinely one of the shortest, sweetest little pages ever. no cap. let's get into it 🫶

---

✨ NAME ✨

_num_pes, _num_pes, shmem_n_pes — literally just returns the number of processing elements (PEs) used to run the application. that's it. that's the whole job. iconic behaviour honestly 👑

(and yes, _num_pes shows up twice in the NAME line up there — that's exactly how it's written in the original, don't come for me 🙈)

---

🌸 SYNOPSIS 🌸

💅 C or C++

#include <mpp/shmem.h>

int _num_pes (void)
int shmem_n_pes (void)

💅 Fortran

include 'mpp/shmem.fh'
I = NUM_PES ()
I = SHMEM_N_PES ()

like, look at how tidy that is. no arguments. nothing to mess up. the vibes are immaculate ✨

---

🦋 DESCRIPTION 🦋

so num_pes() or shmem_n_pes() return the total number of PEs running in an application. that's the whole description, bestie — it's giving "short and confident" and i am obsessed 🎀

the way that this function just tells you how many of you there are?? main character energy fr fr 💀

🔗 SEE ALSO

• intro_shmem(3)
• shmem_my_pe(3)
• shmem_init(3)

go read those next, iykyk 🌈

---

👑 COPYRIGHT 👑

2003-2026, The Open MPI Community

---

💀 no warnings, no bugs, no dangers on this page — it's a clean run, bestie. go forth and count your PEs ✨

---

and that's the page!! 🌸 written by the Open MPI Community, copyright 2003-2026, dated May 14, 2026 — mwah, slay, periodt 💅🎀🦋