MPI_Irsend
Starts a ready-mode nonblocking send.
#include <mpi.h>
int MPI_Irsend(const void *buf, int count, MPI_Datatype datatype, int dest,
int tag, MPI_Comm comm, MPI_Request *request)
USE MPI
! or the older form: INCLUDE 'mpif.h'
MPI_IRSEND(BUF, COUNT, DATATYPE, DEST, TAG, COMM, REQUEST, IERROR)
<type> BUF(*)
INTEGER COUNT, DATATYPE, DEST, TAG, COMM, REQUEST, IERROR
USE mpi_f08
MPI_Irsend(buf, count, datatype, dest, tag, comm, request, ierror)
TYPE(*), DIMENSION(..), INTENT(IN), ASYNCHRONOUS :: buf
INTEGER, INTENT(IN) :: count, dest, tag
TYPE(MPI_Datatype), INTENT(IN) :: datatype
TYPE(MPI_Comm), INTENT(IN) :: comm
TYPE(MPI_Request), INTENT(OUT) :: request
INTEGER, OPTIONAL, INTENT(OUT) :: ierror
buf
: Initial address of send buffer (choice).count
: Number of elements in send buffer (integer).datatype
: Datatype of each send buffer element (handle).dest
: Rank of destination (integer).tag
: Message tag (integer).comm
: Communicator (handle).
request
: Communication request (handle).ierror
: Fortran only: Error status (integer).
MPI_Irsend
starts a ready-mode nonblocking send. Nonblocking calls allocate a communication request object and associate it with the request handle (the argument request). The request can be used later to query the status of the communication or to wait for its completion.
A nonblocking send call indicates that the system may start copying data out of the send buffer. The sender should not modify any part of the send buffer after a nonblocking send operation is called, until the send completes.
* MPI_Rsend