SHMEM_BARRIER_ALL(3)

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💅 SHMEM_BARRIER_ALL(3) — the Open MPI glow-up

okay so bestie, welcome to SHMEM_BARRIER_ALL(3), one of the Open MPI pages, and honestly? it's giving "everyone wait for me" energy 💖

✨ NAME ✨

shmem_barrier_all — suspends the execution of the calling PE until all the other PEs have issued a call to this exact same shmem_barrier_all() statement. no cap, that's the whole vibe check 🫶

🌸 SYNOPSIS 🌸

C or C++:

#include <mpp/shmem.h>

void shmem_barrier_all(void)

Fortran:

include 'mpp/shmem.h'

CALL SHMEM_BARRIER_ALL

🦋 DESCRIPTION 🦋

So here's the tea: shmem_barrier_all literally does not return until all the other PEs have entered this routine at the same point of the execution path. everybody meets up at the same spot, nobody leaves until the whole group chat is present 🎀

And before it synchronizes with the other PEs, shmem_barrier_all makes sure everything you already issued is done — completion of all previously issued local memory stores, plus remote memory updates issued via SHMEM functions like shmem_put32(3). so it's a sync point and a "finish your homework first" checkpoint. iconic, honestly ✨

🍓 EXAMPLES 🍓

   setup_data()
   {
     if (shmem_my_pe() == 0) {
       setup();
     }

     /* All PEs wait for PE 0 to complete setup().  */
     shmem_barrier_all();
   }

🔥 SEE ALSO 🔥

2003-2026, The Open MPI Community

and that's a wrap, my love 🧚 — this page dropped on May 14, 2026, lives under the Open MPI banner, belongs to the SHMEM_BARRIER_ALL(3) fam, and the copyright is 2003-2026, The Open MPI Community. barrier with your besties, never without them 💜🌈⭐

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