NAME
MPI_Get - One Sided data fetch
SYNOPSIS
#include <mpi.h>
int
MPI_Get(orgaddr, orgcnt, orgtype, rank, targdisp, targcnt, targtype, win)
void *orgaddr;
int orgcnt;
MPI_Datatype orgtype;
int rank;
MPI_Aint targdisp;
int targcnt;
MPI_Datatype targtype;
MPI_Win win;
INPUT PARAMETERS
orgaddr
- initial address of origin buffer (choice)
orgcnt - number of entries in origin buffer (nonnegative integer)
orgtype
- datatype of each entry in origin buffer (handle)
rank - rank of target (nonnegative integer)
targdisp
- displacement from window start to the beginning of the target
buffer (nonnegative integer)
targcnt
- number of entries in target buffer (nonnegative integer)
targtype
- datatype of each entry in target buffer (handle)
win - window object used for communication (handle)
NOTES
Similar to MPI_PUT, except that the direction of data transfer is
reversed. Data are copied from the target memory to the origin. 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.
NOTES FOR FORTRAN
All MPI routines in Fortran (except for MPI_WTIME and MPI_WTICK ) have
an additional argument ierr at the end of the argument list. ierr is
an integer and has the same meaning as the return value of the routine
in C. In Fortran, MPI routines are subroutines, and are invoked with
the call statement.
All MPI objects (e.g., MPI_Datatype , MPI_Comm ) are of type INTEGER in
Fortran.
USAGE WITH IMPI EXTENSIONS
The IMPI standard only supports MPI-1 functions. Hence, this function
is currently not designed to operate within an IMPI job.
ERRORS
If an error occurs in an MPI function, the current MPI error handler is
called to handle it. By default, this error handler aborts the MPI
job. The error handler may be changed with MPI_Errhandler_set ; the
predefined error handler MPI_ERRORS_RETURN may be used to cause error
values to be returned (in C and Fortran; this error handler is less
useful in with the C++ MPI bindings. The predefined error handler
MPI::ERRORS_THROW_EXCEPTIONS should be used in C++ if the error value
needs to be recovered). Note that MPI does not guarantee that an MPI
program can continue past an error.
All MPI routines (except MPI_Wtime and MPI_Wtick ) return an error
value; C routines as the value of the function and Fortran routines in
the last argument. The C++ bindings for MPI do not return error
values; instead, error values are communicated by throwing exceptions
of type MPI::Exception (but not by default). Exceptions are only
thrown if the error value is not MPI::SUCCESS .
Note that if the MPI::ERRORS_RETURN handler is set in C++, while MPI
functions will return upon an error, there will be no way to recover
what the actual error value was.
MPI_SUCCESS
- No error; MPI routine completed successfully.
MPI_ERR_WIN
- Invalid window. A common error is to use a null window in a
call.
MPI_ERR_RANK
- Invalid source or destination rank. Ranks must be between
zero and the size of the communicator minus one; ranks in a
receive ( MPI_Recv , MPI_Irecv , MPI_Sendrecv , etc.) may also
be MPI_ANY_SOURCE .
MPI_ERR_OTHER
- Other error; use MPI_Error_string to get more information
about this error code.
MPI_ERR_EPOCH
- This error indicates than an operation has been attempted on a
"closed" window. Certain one-sided operations can only be
performed on windows whose epoch has been started with
MPI_Win_start.
MPI_ERR_INTERN
- An internal error has been detected. This is fatal. Please
send a bug report to the LAM mailing list (see http://www.lam-
mpi.org/contact.php ).
MPI_ERR_TYPENOTSUP
- Type not supported for this operation. This typically applies
to either reduction operations (for which only a limited
combination of datatypes and operations are defined, see MPI-1,
section 4.9.2) or one-sided operations where the actions on
specific datatpyes have not been implemented yet.
SEE ALSO
MPI_Put(3), MPI_Accumulate(3), MPI_Win_create(3), MPI_Win_start(3),
MPI_Win_complete(3), MPI_Win_fence(3), MPI_Win_free(3),
MPI_Win_get_group(3), MPI_Win_get_group(3), MPI_Win_wait(3)
MORE INFORMATION
For more information, please see the official MPI Forum web site, which
contains the text of both the MPI-1 and MPI-2 standards. These
documents contain detailed information about each MPI function (most of
which is not duplicated in these man pages).
http://www.mpi-forum.org/
LOCATION
get.c