MPI_Alltoall - Sends data from all processes to all
processes
SYNOPSIS
C:
#include <mpi.h>
int MPI_Alltoall( sendbuf, sendcount, sendtype,
recvbuf, recvcnt, recvtype, comm )
void *sendbuf;
int sendcount;
MPI_Datatype sendtype;
void *recvbuf;
int recvcnt;
MPI_Datatype recvtype;
MPI_Comm comm;
C++:
#include <mpi.h>
void Intracomm::Alltoall(
const void* sendbuf,
int sendcount,
const Datatype& sendtype,
void* recvbuf,
int recvcount,
const Datatype& recvtype) const
Fortran:
INCLUDE "mpif.h" (or USE MPI)
<type> SENDBUF(*), RECVBUF(*)
INTEGER sendcount, sendtype, recvcount,
recvtype), comm, ierror
CALL MPI_ALLTOALL(sendbuf, sendcount, sendtype,
recvbuf, recvcount, recvtype), comm,
ierror)
STANDARDS
This release implements the MPI 1.2 standard, as
documented by the MPI Forum in the spring 1997 release of
MPI: A Message Passing Interface Standard.
DESCRIPTION
The MPI_Alltoall routine sends data from all processes to
all processes. This routine accepts the following
sendbuf Specifies the starting address of the send
buffer (choice)
sendcount Specifies the number of elements in the send
buffer (integer)
sendtype Specifies the data type of the send buffer
elements (handle)
recvcnt Specifies the number of elements received from
any process (integer)
recvtype Specifies the data type of the receive buffer
elements (handle)
comm Specifies the communicator (handle)
recvbuf Returns the address of the receive buffer
(choice)
ierror Specifies the return code value for successful
completion, which is in MPI_SUCCESS.
MPI_SUCCESS is defined in the mpif.h file.
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