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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 REDHAT

mpi_start

MPI_Start(3)							      LAM/MPI							      MPI_Start(3)

NAME

       MPI_Start -  Initiates a communication with a persistent request handle

SYNOPSIS

       #include <mpi.h>
       int MPI_Start(MPI_Request *req)

INPUT PARAMETER

       req    - communication request (handle)

NOTES

       This function starts a communication that was previously initialized with any of the MPI_*_init functions.

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_ARG
	      - Invalid argument.  Some argument is invalid and is not identified by a specific error class.  This is typically a NULL pointer	or
	      other such error.
       MPI_ERR_REQUEST
	      - Invalid MPI_Request ; either null or, MPI_REQUEST_NULL , in the case of a MPI_Start or MPI_Startall , not a persistent request.

SEE ALSO

       MPI_Bsend_init,	 MPI_Request_free,  MPI_Rsend_init,  MPI_Send_init,  MPI_Ssend_init,  MPI_Startall,  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/sow-
       ing/sowing.tar.gz ), the initial formatting, and some initial text for most of the MPI-1 man pages.

LOCATION

       start.c

LAM
/MPI 6.5.8							    11/10/2002							      MPI_Start(3)