SHMEM_SHORT_GET_NBI(3)

💅 SHMEM_SHORT_GET_NBI(3) — Open MPI 💅

bestie come CLOSER, this is the Open MPI man page for SHMEM_SHORT_GET_NBI(3) and it's literally all about the nonblocking get routines, no cap 🫶

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✨ NAME ✨

okay so this page covers the whole nonblocking-get squad, and here's every single one of them:

• shmem_getmem_nbi(3)
• shmem_char_get_nbi(3)
• shmem_short_get_nbi(3)
• shmem_int_get_nbi(3)
• shmem_long_get_nbi(3)
• shmem_longlong_get_nbi(3)
• shmem_float_get_nbi(3)
• shmem_double_get_nbi(3)
• shmem_longdouble_get_nbi(3)
• shmem_get8_nbi(3)
• shmem_get16_nbi(3)
• shmem_get32_nbi(3)
• shmem_get64_nbi(3)
• shmem_get128_nbi(3)

and what do they DO, you ask? 🧚 the nonblocking get routines provide a method for copying data from a contiguous remote data object on the specified PE to the local data object. that's the vibe. that's the whole thing. periodt.

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🌈 SYNOPSIS 🌈

C or C++

#include <mpp/shmem.h>

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

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

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

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

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

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

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

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

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

void shmem_get8(void *dest, const void *source,
  size_t nelems, int pe)

void shmem_get16(void *dest, const void *source,
  size_t nelems, int pe)

void shmem_get32(void *dest, const void *source,
  size_t nelems, int pe)

void shmem_get64(void *dest, const void *source,
  size_t nelems, int pe)

void shmem_get128(void *dest, const void *source,
  size_t nelems, int pe)

Fortran

INCLUDE "mpp/shmem.fh"

INTEGER nelems, pe

CALL SHMEM_GETMEM_NBI(dest, source, nelems, pe)

CALL SHMEM_CHARACTER_GET_NBI(dest, source, nelems, pe)

CALL SHMEM_COMPLEX_GET_NBI(dest, source, nelems, pe)

CALL SHMEM_DOUBLE_GET_NBI(dest, source, nelems, pe)

CALL SHMEM_INTEGER_GET_NBI(dest, source, nelems, pe)

CALL SHMEM_LOGICAL_GET_NBI(dest, source, nelems, pe)

CALL SHMEM_REAL_GET_NBI(dest, source, nelems, pe)

CALL SHMEM_GET4_NBI(dest, source, nelems, pe)

CALL SHMEM_GET8_NBI(dest, source, nelems, pe)

CALL SHMEM_GET32_NBI(dest, source, nelems, pe)

CALL SHMEM_GET64_NBI(dest, source, nelems, pe)

CALL SHMEM_GET128_NBI(dest, source, nelems, pe)

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🌸 DESCRIPTION 🌸

so the get routines provide a method for copying a contiguous symmetric data object from a different PE to a contiguous data object on the local PE. but here's the ✨ twist ✨ — the routines return after posting the operation. like, they don't wait around. they just yeet the request and dip 🏃‍♀️

the operation is considered complete after a subsequent call to shmem_quiet. and at the completion of shmem_quiet, the data has been delivered to the dest array on the local PE. so if you skip the quiet, you're on your own bestie, the data's still in transit 😭

the arguments, bestie 🎀

• dest — Local data object to be updated.
• source — Data object on the PE identified by pe that contains the data to be copied. This data object must be remotely accessible.
• nelems — Number of elements in the target and source arrays. len must be of type integer. If you are using Fortran, it must be a constant, variable, or array element of default integer type.
• pe — PE number of the remote PE. pe must be of type integer. If you are using Fortran, it must be a constant, variable, or array element of default integer type.

⚠️ Fortran girlies listen up: if you are using Fortran, data types must be of default size. so like, a real variable must be declared as REAL, REAL*4, or REAL(KIND=4). no sneaky custom kinds, mwah 💋

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🦋 NOTES 🦋

see intro_shmem(3) for a definition of the term remotely accessible. iykyk 💅

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👑 EXAMPLES 👑

consider this simple example for Fortran:

PROGRAM REDUCTION
  REAL VALUES, SUM
  COMMON /C/ VALUES
  REAL WORK

  CALL START_PES(0) ! ALLOW ANY NUMBER OF PES
  VALUES = MY_PE() ! INITIALIZE IT TO SOMETHING
  CALL SHMEM_BARRIER_ALL
  SUM = 0.0
  DO I = 0,NUM_PES()-1
    CALL SHMEM_REAL_GET_NBI(WORK, VALUES, 1, I)
    CALL SHMEM_QUIET                ! wait for delivery
    SUM = SUM + WORK
  ENDDO
  PRINT *, 'PE ', MY_PE(), ' COMPUTED SUM=', SUM
  CALL SHMEM_BARRIER_ALL
END

also see: 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!! 🎀 thank you for coming to my ted talk, this was the SHMEM_SHORT_GET_NBI(3) page from Open MPI, dated Sep 10, 2026 — go forth and shmem_quiet before you read your data, i'm literally begging 🙈💖🦋