SHMEM_IPUT64(3)

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💅 SHMEM_IPUT64(3) — the Open MPI glow-up ✨

okay bestie, buckle up — this is the shmem_iput64(3) page from Open MPI, and honestly it's a whole family situation. there's like sixteen of these routines and they're all doing the same iconic thing: transfer strided data to a specified processing element (PE) 🎀

the whole squad, in no particular order (okay, alphabetical order, we're not animals):

✨ SYNOPSIS ✨

🌸 C or C++:

#include <mpp/shmem.h>

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

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

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

void shmem_iput32(void *target, const void *source,
  ptrdiff_t tst, ptrdiff_t sst, size_t len, int pe)

void shmem_iput64(void *target, const void *source,
  ptrdiff_t tst, ptrdiff_t sst, size_t len, int pe)

void shmem_iput128(void *target, const void *source,
  ptrdiff_t tst, ptrdiff_t sst, size_t len, int pe)

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

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

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

void shmem_short_iput(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_IPUT(target, source, tst, sst, len,
& pe)

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

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

CALL SHMEM_IPUT4(target, source, tst, sst, len, pe)

CALL SHMEM_IPUT8(target, source, tst, sst, len, pe)

CALL SHMEM_IPUT32(target, source, tst, sst, len, pe)

CALL SHMEM_IPUT64(target, source, tst, sst, len, pe)

CALL SHMEM_IPUT128(target, source, tst, sst, len, pe)

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

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

💖 DESCRIPTION 💖

so here's the vibe: the shmem_iput routines read the elements of a local array (source) and write them to a remote array (target) on the PE indicated by pe. strided data, remote PE, no cap. 🔥

big important timing tea ☕ — these routines return when the data has been copied out of the source array on the local PE, but not necessarily before the data has been delivered to the remote data object. so like... the send side is done. the arrival side? not guaranteed yet. don't @ me.

🫶 the arguments, bestie:

  • target — the array to be updated on the remote PE. this data object must be remotely accessible. no exceptions, it's giving rules.
  • source — the array containing the data to be copied. that's your local stash.
  • tst — the stride between consecutive elements of the target array. the stride gets scaled by the element size of the target array. a value of 1 means contiguous data. tst must be of type integer — and if you're in Fortran, it has to be a default integer value.
  • sst — the stride between consecutive elements of the source array. this one gets scaled by the element size of the source array. a value of 1 means contiguous data. sst must be of type integer — and in Fortran, it must be a default integer value.
  • len — number of elements in the target and source arrays. len must be of type integer — in 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 — in Fortran it must be a constant, variable, or array element of default integer type.

🌈 typing constraints (the vibe check for your data objects)

target and source data objects must conform to typing constraints, which are, and I quote the universe:

  • shmem_iput32, shmem_iput4: any noncharacter type that has a storage size equal to 32 bits.
  • shmem_iput64, shmem_iput8: any noncharacter type that has a storage size equal to 64 bits.
  • shmem_iput128: any noncharacter type that has a storage size equal to 128 bits.
  • shmem_short_iput: elements of type short.
  • shmem_int_iput: elements of type int.
  • shmem_long_iput: elements of type long.
  • shmem_longlong_iput: elements of type long long.
  • shmem_float_iput: elements of type float.
  • shmem_double_iput: elements of type double.
  • shmem_longdouble_iput: elements of type long double.
  • SHMEM_COMPLEX_IPUT: elements of type complex of default size.
  • SHMEM_DOUBLE_IPUT: (Fortran) elements of type double precision.
  • SHMEM_INTEGER_IPUT: elements of type integer.
  • SHMEM_LOGICAL_IPUT: elements of type logical.
  • SHMEM_REAL_IPUT: elements of type real.
  • SHMEM_LOGICAL_IPUT: elements of type logical.
  • SHMEM_REAL_IPUT: elements of type real.

(and yes, SHMEM_LOGICAL_IPUT and SHMEM_REAL_IPUT are listed twice in the source. the original said it twice, so we're saying it twice. consistency queen 💅)

🚨 also, 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). don't try to be cute with a fancy kind, it won't slay.

🧚 NOTES 🧚

  • intro_shmem(3) is where you go for the definition of the term remotely accessible. that's the lore. go read it. 📖

🍓 EXAMPLES 🍓

okay so consider this simple shmem_long_iput example for C/C++ programs. it's giving tutorial realness:

#include <mpp/shmem.h>

main()
{
  short source[10] = { 1, 2, 3, 4, 5,
  6, 7, 8, 9, 10 };
  static short target[10];

  shmem_init();
  if (shmem_my_pe() == 0) {
    /* put 10 words into target on PE 1 */
    shmem_short_iput(target, source, 1, 2, 5, 1);
  }
  shmem_barrier_all(); /* sync sender and receiver */
  if (shmem_my_pe() == 1) {
    shmem_udcflush(); /* not required on IRIX systems */
    printf("target on PE %d is %d %d %d %d %d0, shmem_my_pe(),
    (int)target[0], (int)target[1], (int)target[2],
    (int)target[3], (int)target[4] );
  }
  shmem_barrier_all(); /* sync before exiting */
}

(that printf line is exactly as it appears in the original, missing quote and all — we do not edit the ancestors 🙈)

⭐ SEE ALSO ⭐

2003-2026, The Open MPI Community

aaaand that's the page, bestie 🫶 this was May 14, 2026 energy, brought to you by Open MPI, SHMEM_IPUT64(3), the one and only. go put some strided data somewhere remote. slay. 💜🎀

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