SHMEM_GET(3)SHMEM_GET(3)


NAME
     shmem_character_get, shmem_complex_get, shmem_double_get,
     shmem_float_get, shmem_get4, shmem_get8, shmem_get32, shmem_get64,
     shmem_get128, shmem_getmem, shmem_int_get, shmem_integer_get,
     shmem_logical_get, shmem_long_get, shmem_longdouble_get,
     shmem_longlong_get, shmem_real_get, shmem_short_get - Transfers data
     from a specified processing element (PE).

SYNOPSIS
     C or C++:

        #include <mpp/shmem.h>

        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_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_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:

        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 get routines provide a high-performance method for copying a
     contiguous data object from a different PE to a contiguous data object
     on a the local PE.  The routines return after the data has been
     delivered to the target array 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:

     Routine                       Data Type of target and source

     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)

     Message Passing Toolkit: MPI Programmer's Manual