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NAME

       MPI_Ibsend -  Starts a nonblocking buffered send

SYNOPSIS

       #include <mpi.h>
       int MPI_Ibsend(void *buf, int count, MPI_Datatype dtype,
                      int dest, int tag, MPI_Comm comm,
                      MPI_Request *preq)

INPUT PARAMETERS

       buf    - initial address of send buffer (choice)
       count  - number of elements in send buffer (integer)
       dtype  - datatype of each send buffer element (handle)
       dest   - rank of destination (integer)
       tag    - message tag (integer)
       comm   - communicator (handle)

OUTPUT PARAMETER

       preq   - communication request (handle)

NOTES

       It  is  generally  a  bad  idea  to  use the MPI_Ibsend function, as it
       guarantees that the entire message  will  suffer  the  overhead  of  an
       additional  memory  copy.   For  large  messages, or when shared memory
       message  transports  are  being  used,  this  overhead  can  be   quite
       expensive.

       The  communication  started  with  this  function  is not guaranteed to
       progress or complete until req has been given to one  of  the  test  or
       wait  functions ( MPI_Test , MPI_Testall , MPI_Testany , MPI_Testsome ,
       MPI_Wait , MPI_Waitall , MPI_Waitany , MPI_Waitsome ).

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

       If an error occurs in an MPI function, the current MPI error handler is
       called to handle it.  By default, this error  handler  aborts  the  MPI
       job.   The  error  handler may be changed with MPI_Errhandler_set ; the
       predefined error handler MPI_ERRORS_RETURN may be used to  cause  error
       values  to  be  returned  (in C and Fortran; this error handler is less
       useful in with the C++ MPI  bindings.   The  predefined  error  handler
       MPI::ERRORS_THROW_EXCEPTIONS  should  be used in C++ if the error value
       needs to be recovered).  Note that MPI does not guarantee that  an  MPI
       program can continue past an error.

       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.   The  C++  bindings  for  MPI do not return error
       values; instead, error values are communicated by  throwing  exceptions
       of  type  MPI::Exception  (but  not  by  default).  Exceptions are only
       thrown if the error value is not MPI::SUCCESS .

       Note that if the MPI::ERRORS_RETURN handler is set in  C++,  while  MPI
       functions  will  return  upon an error, there will be no way to recover
       what the actual error value was.
       MPI_SUCCESS
              - No error; MPI routine completed successfully.
       MPI_ERR_COMM
              - Invalid communicator.   A  common  error  is  to  use  a  null
              communicator in a call (not even allowed in MPI_Comm_rank ).
       MPI_ERR_COUNT
              - Invalid count argument.  Count arguments must be non-negative;
              a count of zero is often valid.
       MPI_ERR_TYPE
              - Invalid datatype argument.  May be an uncommitted MPI_Datatype
              (see MPI_Type_commit ).
       MPI_ERR_TAG
              -  Invalid  tag  argument.  Tags must be non-negative; tags in a
              receive ( MPI_Recv , MPI_Irecv , MPI_Sendrecv , etc.)  may  also
              be MPI_ANY_TAG .  The largest tag value is available through the
              the attribute MPI_TAG_UB .

       MPI_ERR_RANK
              - Invalid source or destination rank.   Ranks  must  be  between
              zero  and  the  size  of  the communicator minus one; ranks in a
              receive ( MPI_Recv , MPI_Irecv , MPI_Sendrecv , etc.)  may  also
              be MPI_ANY_SOURCE .

       MPI_ERR_BUFFER
              -  Invalid  buffer  pointer.  Usually a null buffer where one is
              not valid.

SEE ALSO

       MPI_Bsend, MPI_Test, MPI_Testall, MPI_Testany, MPI_Testsome,  MPI_Wait,
       MPI_Waitall, MPI_Waitany, MPI_Waitsome

MORE INFORMATION

       For more information, please see the official MPI Forum web site, which
       contains the text  of  both  the  MPI-1  and  MPI-2  standards.   These
       documents contain detailed information about each MPI function (most of
       which is not duplicated in these man pages).

       http://www.mpi-forum.org/

ACKNOWLEDGEMENTS

       The LAM Team would like the thank the MPICH Team for the handy  program
       to        generate        man        pages        ("doctext"       from
       ftp://ftp.mcs.anl.gov/pub/sowing/sowing.tar.gz    ),    the     initial
       formatting, and some initial text for most of the MPI-1 man pages.

LOCATION

       ibsend.c