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MPI error message and other applicatioins

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Special Forums UNIX and Linux Applications High Performance Computing MPI error message and other applicatioins
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Old 08-13-2009
Question MPI error message and other applicatioins
1st,I'm a newbie.

I've written a mpi program to realize the parallel computing and encounter many problems.

1. When the computing scale is small, that means the communication time is short, just needs few minutes, such as 14 minutes or less. The program runs well and finished the jog.

But when the computing scale is bigger, that means need hours of running to finish,probelms come. After about half an hour's running,the program exsit with abnormal,the error message is that:p4_error: interrupt SIGx: 6
but the calculating result in the running time is correct.I don't understand the meaning of this error message. Any one can interpret it to me specifically? And if someone could give me the mpi error message list to chech each message's meaning , I'll appreciate it a lot.

2. I'd like to set one rank as the master rank, and give it higher priority. But I still don't know how to se the priority in unix. Maybe someone could give me a way.

Thank you for all your help.
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LEARN ABOUT OSX

mpi_comm_create

MPI_Comm_create(3OpenMPI)												 MPI_Comm_create(3OpenMPI)

NAME

       MPI_Comm_create - Creates a new communicator.

SYNTAX

C Syntax
       #include <mpi.h>
       int MPI_Comm_create(MPI_Comm comm, MPI_Group group, MPI_Comm *newcomm)

Fortran Syntax
       INCLUDE 'mpif.h'
       MPI_COMM_CREATE(COMM, GROUP, NEWCOMM, IERROR)
	    INTEGER   COMM, GROUP, NEW, IERROR

C++ Syntax
       #include <mpi.h>
       MPI::Intercomm MPI::Intercomm::Create(const Group& group) const

       MPI::Intracomm MPI::Intracomm::Create(const Group& group) const

INPUT PARAMETER

       comm	 Communicator (handle).

       group	 Group, which is a subset of the group of comm (handle).

OUTPUT PARAMETERS

       newcomm	 New communicator (handle).

       IERROR	 Fortran only: Error status (integer).

DESCRIPTION

       This  function creates a new communicator newcomm with communication group defined by group and a new context. The function sets newcomm to
       a new communicator that spans all the processes that are in the group.	It sets newcomm to MPI_COMM_NULL for processes that are not in the
       group.	 The  call  is	erroneous if not all group arguments have the same value, or if group is not a subset of the group associated with
       comm. Note that the call must be executed by all processes in comm, even if they do not belong to the new group.

NOTES

       MPI_Comm_create provides a means of making a subset of processes for the purpose of separate MIMD computation, with separate  communication
       space.  newcomm,  which	is created by MPI_Comm_create, can be used in subsequent calls to MPI_Comm_create (or other communicator construc-
       tors) to further subdivide a computation into parallel sub-computations. A more general service is provided by MPI_Comm_split.

ERRORS

       Almost all MPI routines return an error value; C routines as the value of the function and Fortran routines in the last argument. C++ func-
       tions  do not return errors. If the default error handler is set to MPI::ERRORS_THROW_EXCEPTIONS, then on error the C++ exception mechanism
       will be used to throw an MPI:Exception object.

       Before the error value is returned, the current MPI error handler is called. By default, this error handler aborts the MPI job, except  for
       I/O  function  errors. The error handler may be changed with MPI_Comm_set_errhandler; the predefined error handler MPI_ERRORS_RETURN may be
       used to cause error values to be returned. Note that MPI does not guarantee that an MPI program can continue past an error.

SEE ALSO

       MPI_Comm_split

       MPI_Intercomm_create

Open MPI 1.2							  September 2006					 MPI_Comm_create(3OpenMPI)