GNU/Linux |
CentOS 3.1 |
|
MPI_Rsend_init(3) |
MPI_Rsend_init − Builds a handle for a ready send
#include
<mpi.h>
int MPI_Rsend_init(void* buf, int count, MPI_Datatype dtype,
int dest, int tag, MPI_Comm comm,
MPI_Request *req)
buf |
- initial address of send buffer (choice) |
|||
count |
- number of elements sent (integer) |
|||
dtype |
- type of each element (handle) |
|||
dest |
- rank of destination (integer) |
|||
tag |
- message tag (integer) |
|||
comm |
- communicator (handle) |
req |
- communication request (handle) |
The
communication initialized by this function will not be
started until req is given to MPI_Start or
MPI_Startall
.
The communication is then not guaranteed to progress or complete until req has been given to one of the test or wait functions ( MPI_Test , MPI_Testall , MPI_Testany , MPI_Testsome , MPI_Wait , MPI_Waitall , MPI_Waitany , MPI_Waitsome ).
Once any of the
test or wait functions indicate that the communication has
finished, the communication cycle can be started again with
MPI_Start or MPI_Startall
.
However, once
the communication has finished and it is no longer going to
be used, req should be freed with
MPI_Request_free
.
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.
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_COUNT
- Invalid count argument. Count arguments must be non-negative; a count of zero is often valid.
MPI_ERR_TYPE
- Invalid datatype argument. May be an uncommitted MPI_Datatype (see MPI_Type_commit ).
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_TAG
- Invalid tag argument. Tags
must be non-negative; tags in a receive ( MPI_Recv ,
MPI_Irecv , MPI_Sendrecv , etc.) may also be
MPI_ANY_TAG
. The largest tag value is available through the the
attribute MPI_TAG_UB
.
MPI_ERR_COMM
- Invalid communicator. A common error is to use a null communicator in a call (not even allowed in MPI_Comm_rank ).
MPI_ERR_OTHER
- This error is returned when some part of the LAM/MPI implementation is unable to acquire memory.
MPI_Rsend, MPI_Start, MPI_Startall, MPI_Test, MPI_Testall, MPI_Testany, MPI_Testsome, MPI_Wait, MPI_Waitall, MPI_Waitany, MPI_Waitsome
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/
The LAM Team would like the thank the MPICH Team for the handy program to generate man pages ("doctext" from ftp://ftp.mcs.anl.gov/pub/sowing/sowing.tar.gz ), the initial formatting, and some initial text for most of the MPI-1 man pages.
rsendinit.c
MPI_Rsend_init(3) |