SHMEM_LONG_IGET(3)

💖 SHMEM_LONG_IGET 💖

okay bestie, welcome to the Open MPI manual page for SHMEM_LONG_IGET(3) and, like, its entire extended family. yes the whole girl gang is here. sit down, grab a boba, we're doing strided gets 🍓

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✨ NAME ✨

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) — all of them transfer strided data from a specified processing element (PE). that's the whole vibe. 👑

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✨ SYNOPSIS ✨

🩵 C or C++ 🩵

#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 🩵

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 ✨

so the strided get routines retrieve array data that's chilling at address source on a remote PE (pe). 🛰️ the elements of the source array are separated by a stride sst. once the data arrives, it gets stored at the local memory address target, separated by stride tst. and the routines return when the data has been copied into the local target array — like, they wait for it, no ghosting. 💅

the arguments, bestie, let's go 🔍

• target — the array that gets updated on the local PE. this one's the glow-up spot. 🌸
• source — the array holding the data to be copied, sitting on the remote PE. the origin story.
• tst — the stride between consecutive elements of the target array. it gets scaled by the element size of the target array. 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. it gets scaled by the element size of the source array. a value of 1 means contiguous data. sst must be of type integer. if you're calling from Fortran, it must be a default integer value.
• 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 — the 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 (aka the dress code) 👗

target and source data objects must conform to the 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 the page literally runs that same list again, like a remix, so here it is one more time because we do not skip a single crumb: 🍪

• 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.

important: 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). no custom-sized nonsense, she said what she said. ✋

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✨ NOTES ✨

peep intro_shmem(3) for the definition of the term remotely accessible. iykyk. 🧚

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✨ EXAMPLES ✨

the following simple example uses shmem_logical_iget in a Fortran program. 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

also see 👀

intro_shmem(3) shmem_get(3) shmem_quiet(3)

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🌈 COPYRIGHT 🌈

Copyright 2003-2026, The Open MPI Community

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okay and that's the whole page bestie!! 🫶 the footer said this one's from the Open MPI crew, manual name SHMEM_LONG_IGET(3), dated Sep 10, 2026. you ate that. go get those strides. 💅✨🦋