MPI_Ineighbor_alltoallw - Nonblocking version of MPI_Neighbor_alltoallw.
int MPI_Ineighbor_alltoallw(const void *sendbuf, const int sendcounts, const MPI_Aint sdispls, const MPI_Datatype sendtypes, void *recvbuf, const int recvcounts, const MPI_Aint rdispls, const MPI_Datatype recvtypes, MPI_Comm comm, MPI_Request *request)
- - starting address of the send buffer (choice)
- - non-negative integer array (of length outdegree) specifying the number
of elements to send to each neighbor
- - integer array (of length outdegree). Entry j specifies the displacement
in bytes (relative to sendbuf) from which to take the outgoing data
destined for neighbor j (array of integers)
- - array of datatypes (of length outdegree). Entry j specifies the type of
data to send to neighbor j (array of handles)
- - non-negative integer array (of length indegree) specifying the number of
elements that are received from each neighbor
- - integer array (of length indegree). Entry i specifies the displacement
in bytes (relative to recvbuf) at which to place the incoming data from
neighbor i (array of integers).
- - array of datatypes (of length indegree). Entry i specifies the type of
data received from neighbor i (array of handles).
- - communicator with topology structure (handle)
- - starting address of the receive buffer (choice)
- - communication request (handle)
This routine is thread-safe. This means that this routine may be safely used by
multiple threads without the need for any user-provided thread locks. However,
the routine is not interrupt safe. Typically, this is due to the use of memory
allocation routines such as malloc
or other non-MPICH runtime routines
that are themselves not interrupt-safe.
All MPI routines in Fortran (except for MPI_WTIME
have an additional argument ierr
at the end of the argument list.
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
All MPI objects (e.g., MPI_Datatype
) are of type
All MPI routines (except MPI_Wtime
) return an error
value; C routines as the value of the function and Fortran routines in the
last argument. Before the value is returned, the current MPI error handler is
called. By default, this error handler aborts the MPI job. The error handler
may be changed with MPI_Comm_set_errhandler
(for files), and MPI_Win_set_errhandler
(for RMA windows). The MPI-1 routine MPI_Errhandler_set
may be used but
its use is deprecated. The predefined error handler MPI_ERRORS_RETURN
may be used to cause error values to be returned. Note that MPI does
guarentee that an MPI program can continue past an error; however,
MPI implementations will attempt to continue whenever possible.