SHMEM_GET16_NBI(3)

💖 NAME 💖

hey bestie, so this is the manual page for shmem_get16_nbi from Open MPI, and honestly? it's a whole family situation. the page covers all of these:

• 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 the one-line vibe check for the whole squad:

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. 🫶

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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 🌸

okay so here's the tea ☕ the get routines give you a way to copy a contiguous symmetric data object from a different PE over to a contiguous data object on your local PE. and they are nonblocking, which is the whole point — these routines return after posting the operation, like "k I sent it, don't wait up 💅".

so when is it actually done? when is the data actually in dest? not when the call returns, bestie. 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. that's the moment. periodt. 👑

the arguments, one by one:

• dest — local data object to be updated. it's your spot, it's where the goodies land.
• source — data object on the PE identified by pe that contains the data to be copied. this data object must be remotely accessible. iykyk.
• nelems — number of elements in the target and source arrays. len must be of type integer. if you're doing Fortran, it has to be a constant, variable, or array element of default integer type.
• pe — PE number of the remote PE. pe must be of type integer. and again, if you're on Fortran, it's gotta be a constant, variable, or array element of default integer type.

and one more thing for the Fortran girlies: if you are using Fortran, data types must be of default size. so like, a real variable has to be declared as REAL, REAL*4, or REAL(KIND=4). no improvising. 🙈

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🦋 NOTES 🦋

want to know what "remotely accessible" actually means? go read intro_shmem(3), it defines the term. not me outsourcing the definition but it is what it is. 🎀

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🍓 EXAMPLES 🍓

picture this: a simple little Fortran moment. lowkey iconic.

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 👑

Copyright 2003-2026, The Open MPI Community

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and that's the whole page bestie, fr fr 🌈✨ this was SHMEM_GET16_NBI(3) from the Open MPI crew, last touched Sep 10, 2026 — go forth and shmem_quiet before you read your dest, i am begging you 💜🦋