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MPI_Ialltoallw(3)		      MPI		     MPI_Ialltoallw(3)

NAME
       MPI_Ialltoallw  -  Nonblocking generalized all-to-all communication al-
       lowing different	datatypes, counts, and displacements for each partner

SYNOPSIS
       int MPI_Ialltoallw(const	void *sendbuf, const int sendcounts[], const int sdispls[],
			  const	MPI_Datatype sendtypes[], void *recvbuf, const int recvcounts[],
			  const	int rdispls[], const MPI_Datatype recvtypes[], MPI_Comm	comm,
			  MPI_Request *request)

INPUT PARAMETERS
       sendbuf
	      -	starting address of the	send buffer (choice)
       sendcounts
	      -	non-negative integer array (of length group  size)  specifying
	      the number of elements to	send to	each processor
       sdispls
	      -	 integer  array	 (of length group size). Entry j specifies the
	      displacement relative to sendbuf from which to take the outgoing
	      data destined for	process	j
       sendtypes
	      -	 array	of datatypes (of length	group size). Entry j specifies
	      the type of data to send to process j (array of handles)
       recvcounts
	      -	non-negative integer array (of length group  size)  specifying
	      the number of elements that can be received from each processor
       rdispls
	      -	 integer  array	 (of length group size). Entry i specifies the
	      displacement relative to recvbuf at which	to place the  incoming
	      data from	process	i
       recvtypes
	      -	 array	of datatypes (of length	group size). Entry i specifies
	      the type of data received	from process i (array of handles)
       comm   -	communicator (handle)

OUTPUT PARAMETERS
       recvbuf
	      -	starting address of the	receive	buffer (choice)
       request
	      -	communication request (handle)

THREAD AND INTERRUPT SAFETY
       This routine is thread-safe.  This  means  that	this  routine  may  be
       safely  used by multiple	threads	without	the need for any user-provided
       thread locks.  However, the routine is not interrupt safe.   Typically,
       this  is	due to the use of memory allocation routines such as malloc or
       other non-MPICH runtime routines	that  are  themselves  not  interrupt-
       safe.

NOTES FOR FORTRAN
       All  MPI	routines in Fortran (except for	MPI_WTIME and MPI_WTICK	) have
       an additional argument ierr at the end of the argument list.   ierr  is
       an  integer and has the same meaning as the return value	of the routine
       in C.  In Fortran, MPI routines are subroutines,	and are	 invoked  with
       the call	statement.

       All MPI objects (e.g., MPI_Datatype , MPI_Comm )	are of type INTEGER in
       Fortran.

ERRORS
       All MPI routines	(except	MPI_Wtime and  MPI_Wtick  )  return  an	 error
       value;  C routines as the value of the function and Fortran routines in
       the last	argument.  Before the value is returned, the current MPI error
       handler	is called.  By default,	this error handler aborts the MPI job.
       The error handler may be	changed	with MPI_Comm_set_errhandler (for com-
       municators),  MPI_File_set_errhandler  (for files), and MPI_Win_set_er-
       rhandler	(for RMA windows).  The	MPI-1 routine  MPI_Errhandler_set  may
       be  used	 but  its  use	is  deprecated.	  The predefined error handler
       MPI_ERRORS_RETURN may be	used to	cause error  values  to	 be  returned.
       Note  that MPI does not guarentee that an MPI program can continue past
       an error; however, MPI implementations will attempt to  continue	 when-
       ever possible.

				   11/9/2015		     MPI_Ialltoallw(3)

NAME | SYNOPSIS | INPUT PARAMETERS | OUTPUT PARAMETERS | THREAD AND INTERRUPT SAFETY | NOTES FOR FORTRAN | ERRORS

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