plucky (3) shmem_double_get.openmpi.3.gz

SYNOPSIS

       C or C++:

          #include <mpp/shmem.h>

          void shmem_get32(void *target, const void *source,
            size_t len, int pe)

          void shmem_get64(void *target, const void *source,
            size_t len, int pe)

          void shmem_get128(void *target, const void *source,
            size_t len, int pe)

          void shmem_getmem(void *target, const void *source,
            size_t len, int pe)

          void shmem_int_get(int *target, const int *source,
            size_t len, int pe)

          void shmem_double_get(double *target, const double *source,
            size_t len, int pe)

          void shmem_float_get(float *target, const float *source,
            size_t len, int pe)

          void shmem_long_get(long *target, const long *source,
            size_t len, int pe)

          void shmem_longdouble_get(long double *target,
            const long double *source, size_t len, int pe)

          void shmem_longlong_get(long long *target,
            const long long *source, size_t len, int pe)

          void shmem_short_get(short *target,
            const short *source, size_t len, int pe)

       Fortran:

          INCLUDE "mpp/shmem.fh"

          INTEGER len, pe

          CALL SHMEM_CHARACTER_GET(target, source, len, pe)

          CALL SHMEM_COMPLEX_GET(target, source, len, pe)

          CALL SHMEM_DOUBLE_GET(target, source, len, pe)

          CALL SHMEM_GET4(target, source, len, pe)

          CALL SHMEM_GET8(target, source, len, pe)

          CALL SHMEM_GET32(target, source, len, pe)

          CALL SHMEM_GET64(target, source, len, pe)

          CALL SHMEM_GET128(target, source, len, pe)

          CALL SHMEM_GETMEM(target, source, len, pe)

          CALL SHMEM_INTEGER_GET(target, source, len, pe)

          CALL SHMEM_LOGICAL_GET(target, source, len, pe)

          CALL SHMEM_REAL_GET(target, source, len, pe)

DESCRIPTION

       The shmem_get routines transfer nelems elements of the data object at address source on the remote PE pe,
       to the data object at address target on the local PE. These routines  return  after  the  data  has  been
       copied to address target on the local PE.

       The arguments are as follows:

       target Local data object to be updated.

       source Data  object on the PE identified by pe that contains the data to be copied. This data object must
              be remotely accessible.

       len    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.

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

       shmem_getmem: Fortran: Any noncharacter type. C: Any data type. len is
              scaled in bytes.

       shmem_get4, shmem_get32: Any noncharacter type that has a storage size
              equal to 32 bits.

       {shmem_get8, shmem_get64}: Any noncharacter type that has a storage size equal to
              64 bits.

       shmem_get128: Any noncharacter type that has a storage size equal to 128
              bits.

       shmem_short_get: Elements of type short.

       shmem_int_get: Elements of type int.

       shmem_long_get: Elements of type long.

       shmem_longlong_get: Elements of type long long.

       shmem_float_get: Elements of type float.

       shmem_double_get: Elements of type double.

       shmem_longdouble_get: Elements of type long double.

       SHMEM_CHARACTER_GET: Elements of type character. len is the number of
              characters to transfer. The actual character lengths  of  the  source  and  target  variables  are
              ignored.

       SHMEM_COMPLEX_GET: Elements of type complex of default size.

       SHMEM_DOUBLE_GET: (Fortran) Elements of type double precision.

       SHMEM_INTEGER_GET: Elements of type integer.

       SHMEM_LOGICAL_GET: Elements of type logical.

       SHMEM_REAL_GET: Elements of type real.

       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).

NOTES

       See intro_shmem(3) for a definition of the term remotely accessible.

EXAMPLES

       Consider this simple example for Fortran.

          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(WORK, VALUES, 1, I)
              SUM = SUM + WORK
            ENDDO
            PRINT *, 'PE ', MY_PE(), ' COMPUTED SUM=', SUM
            CALL SHMEM_BARRIER_ALL
          END

       SEE ALSO:
          intro_shmem(3) shmem_put(3) shmem_iget(3) shmem_quiet(3)

COPYRIGHT

       2003-2025, The Open MPI Community

                                                  Feb 17, 2025                               SHMEM_DOUBLE_GET(3)