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NAME

       MPI_Iallgather  -   Gathers  data  from  all  tasks  and distribute the
       combined data to all tasks in a nonblocking way

SYNOPSIS

       int MPI_Iallgather(const void *sendbuf, int sendcount, MPI_Datatype sendtype,
                          void *recvbuf, int recvcount, MPI_Datatype recvtype,
                          MPI_Comm comm, MPI_Request *request)

INPUT PARAMETERS

       sendbuf
              - starting address of the send buffer (choice)
       sendcount
              - number of elements in send buffer (non-negative integer)
       sendtype
              - data type of send buffer elements (handle)
       recvcount
              - number of elements in receive buffer (non-negative integer)
       recvtype
              - data type of receive buffer elements (handle)
       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
       communicators),     MPI_File_set_errhandler     (for     files),    and
       MPI_Win_set_errhandler  (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 whenever possible.

LOCATION

       /tmp/gyCYfBi4J6/mpich-3.1/src/mpi/coll/iallgather.c

                                   2/20/2014                 MPI_Iallgather(3)



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