08-13-2009
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_rank
MPI_Comm_rank(3OpenMPI) MPI_Comm_rank(3OpenMPI)
NAME
MPI_Comm_rank - Determines the rank of the calling process in the communicator.
SYNTAX
C Syntax
#include <mpi.h>
int MPI_Comm_rank(MPI_Comm comm, int *rank)
Fortran Syntax
INCLUDE 'mpif.h'
MPI_COMM_RANK(COMM, RANK, IERROR)
INTEGER COMM, RANK, IERROR
C++ Syntax
#include <mpi.h>
int Comm::Get_rank() const
INPUT PARAMETERS
comm Communicator (handle).
OUTPUT PARAMETERS
rank Rank of the calling process in group of comm (integer).
IERROR Fortran only: Error status (integer).
DESCRIPTION
This function gives the rank of the process in the particular communicator's group. It is equivalent to accessing the communicator's group
with MPI_Comm_group, computing the rank using MPI_Group_rank, and then freeing the temporary group via MPI_Group_free.
Many programs will be written with the master-slave model, where one process (such as the rank-zero process) will play a supervisory role,
and the other processes will serve as compute nodes. In this framework, MPI_Comm_size and MPI_Comm_rank are useful for determining the
roles of the various processes of a communicator.
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_group
MPI_Comm_size
MPI_Comm_compare
Open MPI 1.2 September 2006 MPI_Comm_rank(3OpenMPI)