SHMEM_PUT128_NBI(3)

SHMEM_PUT128_NBI 💅✨

okay bestie, this is a page from the Open MPI manual, and it's all about the nonblocking put girlies 🫶

The whole squad is: shmem_putmem_nbi(3), shmem_char_put_nbi(3), shmem_short_put_nbi(3), shmem_int_put_nbi(3), shmem_long_put_nbi(3), shmem_longlong_put_nbi(3), shmem_float_put_nbi(3), shmem_double_put_nbi(3), shmem_longdouble_put_nbi(3), shmem_put8_nbi(3), shmem_put16_nbi(3), shmem_put32_nbi(3), shmem_put64_nbi(3), shmem_put128_nbi(3) — and what they all do is give you a way to copy data from a contiguous local data object over to a data object living on a specified PE. no cap. 💖

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✨ SYNOPSIS ✨

C or C++:

#include <mpp/shmem.h>

void shmem_putmem_nbi(void *dest, const void *source,
  size_t nelems, int pe)

void shmem_char_put(char *dest, const char *source,
  size_t nelems, int pe)

void shmem_short_put(short *dest, const short *source,
  size_t nelems, int pe)

void shmem_int_put(int *dest, const int *source,
  size_t nelems, int pe)

void shmem_long_put(long *dest, const long *source,
  size_t nelems, int pe)

void shmem_longlong_put(long long *dest, const long long *source,
  size_t nelems, int pe)

void shmem_float_put(float *dest, const float *source,
  size_t nelems, int pe)

void shmem_double_put(double *dest, const double *source,
  size_t nelems, int pe)

void shmem_longdouble_put(long double *dest, const long double *source,
  size_t nelems, int pe)

void shmem_put8(void *dest, const void *source,
  size_t nelems, int pe)

void shmem_put16(void *dest, const void *source,
  size_t nelems, int pe)

void shmem_put32(void *dest, const void *source,
  size_t nelems, int pe)

void shmem_put64(void *dest, const void *source,
  size_t nelems, int pe)

void shmem_put128(void *dest, const void *source,
  size_t nelems, int pe)

Fortran:

INCLUDE "mpp/shmem.fh"

INTEGER nelems, pe

CALL SHMEM_PUTMEM_NBI(dest, source, nelems, pe)

CALL SHMEM_CHARACTER_PUT_NBI(dest, source, nelems, pe)

CALL SHMEM_COMPLEX_PUT_NBI(dest, source, nelems, pe)

CALL SHMEM_DOUBLE_PUT_NBI(dest, source, nelems, pe)

CALL SHMEM_INTEGER_PUT_NBI(dest, source, nelems, pe)

CALL SHMEM_LOGICAL_PUT_NBI(dest, source, nelems, pe)

CALL SHMEM_REAL_PUT_NBI(dest, source, nelems, pe)

CALL SHMEM_PUT4_NBI(dest, source, nelems, pe)

CALL SHMEM_PUT8_NBI(dest, source, nelems, pe)

CALL SHMEM_PUT32_NBI(dest, source, nelems, pe)

CALL SHMEM_PUT64_NBI(dest, source, nelems, pe)

CALL SHMEM_PUT128_NBI(dest, source, nelems, pe)

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🌸 DESCRIPTION 🌸

so the way these work is: the routine returns right after posting the operation. it is not done yet, bestie, do not be fooled 😭. the operation is considered complete only after a subsequent call to shmem_quiet. and at the completion of shmem_quiet, the data has been copied into the dest array on the destination PE. slay. 💅

but listen 🙈 — the delivery of data words into the data object on the destination PE may occur in any order. AND, two successive put routines may deliver data out of order unless you introduce a call to shmem_fence between the two calls. so if order matters to you, fence it, periodt.

🎀 The arguments, explained 🎀

• dest — the data object to be updated on the remote PE. this one has to be remotely accessible, no exceptions 💜
• source — the data object holding the data you wanna copy.
• nelems — how many elements are in the dest and source arrays. for C, nelems must be of type size_t. if you're in Fortran, it has to be a constant, variable, or array element of default integer type.
• pe — the PE number of the remote PE. pe must be of type integer. if you're using Fortran, again it has to be a constant, variable, or array element of default integer type.

Fortran girlies, this one's for you: data types must be of default size. like, a real variable has to be declared as REAL, REAL*4, or REAL(KIND=4). don't get cute with it 🌟

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🦋 NOTES 🦋

if you wanna know what "remotely accessible" even means (valid question, icon), go read intro_shmem(3). it's defined there. iykyk 🫶

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💖 EXAMPLES 💖

here's a cute lil' simple example for C. look at her go:

#include <stdio.h>
#include <mpp/shmem.h>

main()
{
  long source[10] = { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
  static long target[10];
  shmem_init();

  if (shmem_my_pe() == 0) {
    /* put 10 words into target on PE 1 */
    shmem_long_put_nbi(target, source, 10, 1);
    shmem_quiet();
  }
  shmem_barrier_all();  /* sync sender and receiver */
  if (shmem_my_pe() == 1)
    shmem_udcflush();  /* not required on Altix systems */
  printf("target[0] on PE %d is %d\n", shmem_my_pe(), target[0]);
}

See also:

• intro_shmem(3)
• shmem_quiet(3)

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👑 Copyright 👑

2003-2026, The Open MPI Community

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and that's the whole page, bestie 🎀 mwah 💋 — this was SHMEM_PUT128_NBI(3) from the Open MPI crew, dated Sep 10, 2026. go forth and put your data nonblockingly, you absolute main character 👑✨🦋