SHMEM_LONGLONG_GET_NBI(3)

💅 SHMEM_LONGLONG_GET_NBI(3) — bestie edition 💅

okay so real talk: this is the Open MPI man page for shmem_longlong_get_nbi and all its lil sibling nonblocking get routines, and we are gonna get you fluent in it, no cap. 🦋

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. ✨

The whole girliepop squad is:

• 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)

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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. Here's the tea tho: these routines return after posting the operation. Like, they dip immediately, okay? 👋

The operation is considered complete after a subsequent call to shmem_quiet. At the completion of shmem_quiet, the data has been delivered to the dest array on the local PE. So basically: post it, then shmem_quiet is your "okay bestie, did it actually land" moment. 😌

The arguments, one by one:

• dest — Local data object to be updated. this is the glow-up destination 💖
• source — Data object on the PE identified by pe that contains the data to be copied. This data object must be remotely accessible. no exceptions, she has to be reachable fr fr
• 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. For example, a real variable must be declared as REAL, REAL*4, or REAL(KIND=4). don't get cute with it. 🙈

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📝 NOTES 📝

See intro_shmem(3) for a definition of the term remotely accessible. (iykyk — that's where the lore lives 📖)

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🎀 EXAMPLES 🎀

okay here's a simple lil Fortran moment, observe and take notes 👑

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

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, you ate that 🫶 this was Open MPI's SHMEM_LONGLONG_GET_NBI(3), dated Sep 10, 2026 — go forth and get your data, just don't forget the shmem_quiet. periodt. 💅✨