MPI_Send(3) man page (version 4.0.7)

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Table of Contents

Name

MPI_Send - Performs a standard-mode blocking send.

Syntax

C Syntax

#include <mpi.h>
int MPI_Send(const void *buf, int count, MPI_Datatype datatype, int dest,
 int tag, MPI_Comm comm)

Fortran Syntax

USE MPI
! or the older form: INCLUDE ’mpif.h’
MPI_SEND(BUF, COUNT, DATATYPE, DEST, TAG, COMM, IERROR)
 <type> BUF(*)
 INTEGER COUNT, DATATYPE, DEST, TAG, COMM, IERROR

Fortran 2008 Syntax

USE mpi_f08
MPI_Send(buf, count, datatype, dest, tag, comm, ierror)
 TYPE(*), DIMENSION(..), INTENT(IN) :: buf
 INTEGER, INTENT(IN) :: count, dest, tag
 TYPE(MPI_Datatype), INTENT(IN) :: datatype
 TYPE(MPI_Comm), INTENT(IN) :: comm
 INTEGER, OPTIONAL, INTENT(OUT) :: ierror

Input Parameters

buf

Initial address of send buffer (choice).

count

Number of elements send (nonnegative integer).

datatype

Datatype of each send buffer element (handle).

dest

Rank of destination (integer).

tag

Message tag (integer).

comm

Communicator (handle).

Output Parameter

IERROR

Fortran only: Error status (integer).

Description

MPI_Send performs a standard-mode, blocking send.

Note

This routine will block until the message is sent to the destination. For an in-depth explanation of the semantics of the standard-mode send, refer to the MPI-1 Standard.

Errors

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.

See Also

MPI_Isend
MPI_Bsend
MPI_Recv
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Page last modified: 16-Nov-2021
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