SHMEM_SHORT_IGET(3)

👑 NAME 👑

hiii bestie ✨ say hello to the whole strided-get friend group 💖 — all of these cuties live in the same manpage because they're literally the same vibe with different types:

shmem_complex_iget(3), shmem_double_iget(3), shmem_float_iget(3), shmem_iget4(3), shmem_iget8(3), shmem_iget32(3), shmem_iget64(3), shmem_iget128(3), shmem_int_iget(3), shmem_integer_iget(3), shmem_logical_iget(3), shmem_long_iget(3), shmem_longdouble_iget(3), shmem_longlong_iget(3), shmem_real_iget(3), shmem_short_iget(3)

And what do they do? They transfer strided data from a specified processing element (PE). That's the whole gig. Slay. 💅

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✨ SYNOPSIS ✨

C or C++: no cap, it's giving <mpp/shmem.h>

#include <mpp/shmem.h>

void shmem_iget32(void *target, const void *source,
  ptrdiff_t tst, ptrdiff_t sst, size_t len, int pe)

void shmem_iget64(void *target, const void *source,
  ptrdiff_t tst, ptrdiff_t sst, size_t len, int pe)

void shmem_iget128(void *target, const void *source,
  ptrdiff_t tst, ptrdiff_t sst, size_t len, int pe)

void shmem_int_iget(int *target, const int *source,
  ptrdiff_t tst, ptrdiff_t sst, size_t len, int pe)

void shmem_double_iget(double *target, const double *source,
  ptrdiff_t tst, ptrdiff_t sst, size_t len, int pe)

void shmem_float_iget(float *target, const float *source,
  ptrdiff_t tst, ptrdiff_t sst, size_t len, int pe)

void shmem_long_iget(long *target, const long *source,
  ptrdiff_t tst, ptrdiff_t sst, size_t len, int pe)

void shmem_longdouble_iget(long double *target,
  const long double *source, ptrdiff_t tst, ptrdiff_t sst,size_t len, int pe)

void shmem_longlong_iget(long long *target,
  const long long *source, ptrdiff_t tst, ptrdiff_t sst, size_t len, int pe)

void shmem_short_iget(short *target,
  const short *source, ptrdiff_t tst, ptrdiff_t sst, size_t len, int pe)

Fortran: say it with me, INCLUDE "mpp/shmem.fh" 🎀

INCLUDE "mpp/shmem.fh"

INTEGER tst, sst, len, pe

CALL SHMEM_COMPLEX_IGET(target, source, tst, sst, len,
& pe)

CALL SHMEM_DOUBLE_IGET(target, source, tst, sst, len,
& pe)

CALL SHMEM_IGET4(target, source, tst, sst, len, pe)

CALL SHMEM_IGET8(target, source, tst, sst, len, pe)

CALL SHMEM_IGET32(target, source, tst, sst, len, pe)

CALL SHMEM_IGET64(target, source, tst, sst, len, pe)

CALL SHMEM_IGET128(target, source, tst, sst, len, pe)

CALL SHMEM_INTEGER_IGET(target, source, tst, sst, len,
& pe)

CALL SHMEM_LOGICAL_IGET(target, source, tst, sst, len,
& pe)

CALL SHMEM_REAL_IGET(target, source, tst, sst, len, pe)

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🌸 DESCRIPTION 🌸

okay so here's the tea ☕ — these strided get routines retrieve array data that's available at the address source on the remote PE (pe). The elements of the source array are separated by a stride, sst. Once the data comes through, it gets stored at the local memory address target, separated by stride tst. The routines return when the data has been copied into the local target array — like, they wait for it, no ghosting. 🫶

The arguments are, in order, bestie:

• target — the array that gets updated on the local PE. this is the glow-up destination 💖
• source — the array holding the data to be copied, living on the remote PE.
• tst — the stride between consecutive elements of the target array. It's scaled by the element size of the target array, and a value of 1 means contiguous data. tst must be of type integer. If you're calling from Fortran, it must be a default integer value.
• sst — the stride between consecutive elements of the source array. Scaled by the element size of the source array, and a value of 1 means contiguous data. sst must be of type integer. From Fortran? default integer value, periodt.
• len — number of elements in the target and source arrays. len must be of type integer. If you're 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're using Fortran, it must be a constant, variable, or array element of default integer type.

the typing constraints (do NOT skip this, iykyk)

The target and source data objects must conform to typing constraints, which are as follows:

• shmem_iget32, shmem_iget4 — any noncharacter type that has a storage size equal to 32 bits.
• shmem_iget64, shmem_iget8 — any noncharacter type that has a storage size equal to 64 bits.
• shmem_iget128 — any noncharacter type that has a storage size equal to 128 bits.
• shmem_short_iget — elements of type short.
• shmem_int_iget — elements of type int.
• shmem_long_iget — elements of type long.
• shmem_longlong_iget — elements of type long long.
• shmem_float_iget — elements of type float.
• shmem_double_iget — elements of type double.
• shmem_longdouble_iget — elements of type long double.
• SHMEM_COMPLEX_IGET — elements of type complex of default size.
• SHMEM_DOUBLE_IGET — (Fortran) elements of type double precision.
• SHMEM_INTEGER_IGET — elements of type integer.
• SHMEM_LOGICAL_IGET — elements of type logical.
• SHMEM_REAL_IGET — elements of type real.

and then, because the manpage said it with its whole chest, here it is again 💀 (yes, fr fr, it lists these twice — the original did too, and we keep every single detail, no editing the receipts):

• shmem_longdouble_iget — elements of type long double.
• SHMEM_COMPLEX_IGET — elements of type complex of default size.
• SHMEM_DOUBLE_IGET — (Fortran) elements of type double precision.
• SHMEM_INTEGER_IGET — elements of type integer.
• SHMEM_LOGICAL_IGET — elements of type logical.
• SHMEM_REAL_IGET — elements of type real.

If you're 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). 🙈

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💅 NOTES 💅

Go read intro_shmem(3) for a definition of the term remotely accessible — that word is load-bearing, bestie, don't just skip past it.

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🦋 EXAMPLES 🦋

Here's a cute little Fortran moment using shmem_logical_iget. Compile this example with the -lsma compiler option 👑

PROGRAM STRIDELOGICAL
  LOGICAL SOURCE(10), TARGET(5)
  SAVE SOURCE ! SAVE MAKES IT REMOTELY ACCESSIBLE
  DATA SOURCE /.T.,.F.,.T.,.F.,.T.,.F.,.T.,.F.,.T.,.F./
  DATA TARGET / 5*.F. /

  CALL START_PES(2)
  IF (MY_PE() .EQ. 0) THEN
    CALL SHMEM_LOGICAL_IGET(TARGET, SOURCE, 1, 2, 5, 1)
    PRINT*,'TARGET AFTER SHMEM_LOGICAL_IGET:',TARGET
  ENDIF
  CALL SHMEM_BARRIER_ALL
END

See also: intro_shmem(3) shmem_get(3) shmem_quiet(3)

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and that's the whole page babes 🌈 this one's from Sep 10, 2026, brought to you by the Open MPI girlies — stay strided, stay slay 🎀💖✨