SHMEM_BARRIER_ALL(3)

📦
version 5.0.10 · 7 versions
, in ubuntu stonking

💖 SHMEM_BARRIER_ALL(3) 💖

okay bestie, welcome to the Open MPI corner of the world, this one's a classic

✨ NAME ✨

shmem_barrier_all — literally just pauses the calling PE and holds it there until every other PE rolls up and calls this exact same shmem_barrier_all() statement 🫶

🌸 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 will not return until all the other PEs have entered this routine at the same point of the execution path. No sneaking past, no early exit, no main character behavior. Everyone arrives, then everyone goes. periodt 💅

And before it actually syncs up with the other PEs, shmem_barrier_all makes sure everything's wrapped up first — specifically, completion of all previously issued local memory stores and remote memory updates that got issued through SHMEM functions like shmem_put32(3). So all your little writes are done and dusted before the barrier clears. no cap ✨

🎀 EXAMPLES 🎀

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

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

See also:

Copyright 2003-2026, The Open MPI Community

and that's the whole page bestie, mwah 🍓 this was SHMEM_BARRIER_ALL(3) from the Open MPI crew, last touched Sep 10, 2026 — go sync up with your friends, you got this 💖🧚

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