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MPI_Start - Initiates a communication using a persistent request
handle.
#include <mpi.h>
int MPI_Start(MPI_Request *request)
INCLUDE ’mpif.h’
MPI_START(REQUEST, IERROR)
INTEGER REQUEST, IERROR
#include <mpi.h>
void Prequest::Start()
- request
- Communication request (handle).
- IERROR
- Fortran only: Error status (integer).
A communication (send
or receive) that uses a persistent request is initiated by the function
MPI_Start.
The argument, request, is a handle returned by one of the persistent
communication-request initialization functions (MPI_Send_init, MPI_Bsend_init,
MPI_Ssend_init, MPI_Rsend_init, MPI_Recv_init). The associated request
should be inactive and becomes active once the call is made.
If the request
is for a send with ready mode, then a matching receive should be posted
before the call is made. From the time the call is made until after the
operation completes, the communication buffer should not be accessed.
The
call is local, with semantics similar to the nonblocking communication
operations (see Section 3.7 in the MPI-1 Standard, "Nonblocking Communication.")
That is, a call to MPI_Start with a request created by MPI_Send_init starts
a communication in the same manner as a call to MPI_Isend; a call to MPI_Start
with a request created by MPI_Bsend_init starts a communication in the
same manner as a call to MPI_Ibsend; and so on.
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_Bsend_init
MPI_Rsend_init
MPI_Send_init
MPI_Sssend_init
MPI_Recv_init
MPI_Startall
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