SHMEM_QUIET(3)

💖 NAME 💖

okay so bestie, this is Open MPI's shmem_quiet(3) — the function that literally waits for completion of all outstanding remote writes issued by a processing element (PE). 💅

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✨ SYNOPSIS ✨

C or C++:

#include <mpp/shmem.h>

void shmem_quiet(void);

Fortran:

CALL SHMEM_QUIET

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🌸 DESCRIPTION 🌸

shmem_quiet ensures ordering of put (remote write) operations. All put operations issued to any processing element (PE) prior to the call to shmem_quiet are guaranteed to be visible to all other PEs no later than any subsequent memory load or store, remote put or get, or synchronization operations that follow the call to shmem_quiet. 🫶

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🎀 NOTES 🎀

• shmem_quiet is most useful as a way of ensuring ordering of delivery of several put operations. For example, you might use shmem_quiet to await delivery of a block of data before issuing another put, which sets a completion flag on another PE. 🦋
• shmem_quiet is not usually needed if shmem_barrier_all(3) or shmem_barrier(3) are called. The barrier routines all wait for the completion of outstanding remote writes (puts). ✨

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🦋 EXAMPLES 🦋

       PROGRAM COMPFLAG
         INCLUDE "mpp/shmem.fh"

         INTEGER FLAG_VAR, ARRAY(100), RECEIVER, SENDER
         COMMON/FLAG/FLAG_VAR
         COMMON/DATA/ARRAY
         INTRINSIC MY_PE

         FLAG_VAR = 0
         CALL SHMEM_BARRIER_ALL ! wait for FLAG_VAR to be initialized
         SENDER = 0                        ! PE 0 sends the data
         RECEIVER = 1                      ! PE 1 receives the data

         IF (MY_PE() .EQ. 0) THEN
           ARRAY = 33
           CALL SHMEM_PUT(ARRAY, ARRAY, 100, RECEIVER) ! start sending data
           CALL SHMEM_QUIET                ! wait for delivery
           CALL SHMEM_PUT(FLAG_VAR, 1, 1, RECEIVER) ! send completion flag
         ELSE IF (MY_PE() .EQ. RECEIVER) THEN
           CALL SHMEM_UDCFLUSH
           CALL SHMEM_WAIT(FLAG_VAR, 0)
           PRINT *,ARRAY                       ! ARRAY has been delivered
         ENDIF
       END

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💜 SEE ALSO 💜

• intro_shmem(3)
• shmem_barrier(3)
• shmem_barrier_all(3)
• shmem_fence(3)
• shmem_put(3)
• shmem_wait(3)

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okay that's the whole page, bestie! 💖 Cute little sign-off: source/version vibes are gitclone / Unreleased developer copy, and the footer tag is SHMEM_QUIET(3) — slay, bye! 🎀✨