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MPI_Get, MPI_Rget - Copies data from the target memory to the
origin.
#include <mpi.h>
MPI_Get(void *origin_addr, int origin_count, MPI_Datatype
origin_datatype, int target_rank, MPI_Aint target_disp,
int target_count, MPI_Datatype target_datatype, MPI_Win win)
MPI_Rget(void *origin_addr, int origin_count, MPI_Datatype
origin_datatype, int target_rank, MPI_Aint target_disp,
int target_count, MPI_Datatype target_datatype, MPI_Win win,
MPI_Request *request)
INCLUDE ’mpif.h’
MPI_GET(ORIGIN_ADDR, ORIGIN_COUNT, ORIGIN_DATATYPE, TARGET_RANK,
TARGET_DISP, TARGET_COUNT, TARGET_DATATYPE, WIN, IERROR)
<type> ORIGIN_ADDR(*)
INTEGER(KIND=MPI_ADDRESS_KIND) TARGET_DISP
INTEGER ORIGIN_COUNT, ORIGIN_DATATYPE, TARGET_RANK,
TARGET_COUNT, TARGET_DATATYPE, WIN, IERROR
MPI_RGET(ORIGIN_ADDR, ORIGIN_COUNT, ORIGIN_DATATYPE, TARGET_RANK,
TARGET_DISP, TARGET_COUNT, TARGET_DATATYPE, WIN, REQUEST, IERROR)
<type> ORIGIN_ADDR(*)
INTEGER(KIND=MPI_ADDRESS_KIND) TARGET_DISP
INTEGER ORIGIN_COUNT, ORIGIN_DATATYPE, TARGET_RANK,
TARGET_COUNT, TARGET_DATATYPE, WIN, REQUEST, IERROR
#include <mpi.h>
void MPI::Win::Get(const void *origin_addr, int origin_count,
const MPI::Datatype& origin_datatype, int target_rank,
MPI::Aint target_disp, int target_count,
const MPI::Datatype& target_datatype) const
- origin_addr
- Initial address of origin buffer (choice).
- origin_count
- Number of entries in origin buffer (nonnegative integer).
- origin_datatype
- Data type of each entry in origin buffer (handle).
- target_rank
- Rank of target
(nonnegative integer).
- target_disp
- Displacement from window start to the
beginning of the target buffer (nonnegative integer).
- target_count
- Number
of entries in target buffer (nonnegative integer).
- target datatype
- datatype
of each entry in target buffer (handle)
- win
- window object used for communication
(handle)
- request
- MPI_Rget: RMA request
- IERROR
- Fortran
only: Error status (integer).
MPI_Get copies data from the target
memory to the origin, similar to MPI_Put, except that the direction of
data transfer is reversed. The origin_datatype may not specify overlapping
entries in the origin buffer. The target buffer must be contained within
the target window, and the copied data must fit, without truncation, in
the origin buffer. Only processes within the same node can access the target
window.
MPI_Rget is similar to MPI_Get, except that it allocates a communication
request object and associates it with the request handle (the argument
request) that can be used to wait or test for completion. The completion
of an MPI_Rget operation indicates that the data is available in the origin
buffer. If origin_addr points to memory attached to a window, then the data
becomes available in the private copy of this window.
The
MPI standard prescribes portable Fortran syntax for the TARGET_DISP argument
only for Fortran 90. FORTRAN 77 users may use the non-portable syntax
INTEGER*MPI_ADDRESS_KIND TARGET_DISP
where MPI_ADDRESS_KIND is a constant defined in mpif.h and gives the length
of the declared integer in bytes.
Almost all MPI routines return
an error value; C routines as the value of the function and Fortran routines
in the last argument. C++ functions do not return errors. If the default
error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the
C++ exception mechanism will be used to throw an MPI::Exception object.
Before the error value is returned, the current MPI error handler is called.
By default, this error handler aborts the MPI job, except for I/O function
errors. The error handler may be changed with MPI_Comm_set_errhandler; the
predefined error handler MPI_ERRORS_RETURN may be used to cause error values
to be returned. Note that MPI does not guarantee that an MPI program can
continue past an error.
MPI_Put
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