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 ALSOintro_shmem(3), shmem_put(3), shmem_iget(3), shmem_quiet(3)
Message Passing Toolkit: MPI Programmer's Manual
