MPI_ALLTOALL(3)MPI_ALLTOALL(3)NAMEMPI_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.
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MPI_ALLTOALL(3)MPI_ALLTOALL(3)DESCRIPTION
The MPI_Alltoall routine sends data from all processes to all processes.
This routine accepts the following parameters:
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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