SHMEM_GET(3) Open MPI SHMEM_GET(3)
NAME
shmem_character_get(3), shmem_complex_get(3), shmem_double_get(3),
shmem_float_get(3), shmem_get4(3), shmem_get8(3), shmem_get32(3),
shmem_get64(3), shmem_get128(3), shmem_getmem(3), shmem_int_get(3),
shmem_integer_get(3), shmem_logical_get(3), shmem_long_get(3),
shmem_longdouble_get(3), shmem_longlong_get(3), shmem_real_get(3),
shmem_short_get(3) - Transfers data from a specified processing element
(PE).
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 tar-
get 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 con-
stant, 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 el-
ement 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 exam-
ple, 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)
4.1.2 Nov 24, 2021 SHMEM_GET(3)
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