04-27-2009
The MPI specification predated Beowulf clusters, my friend. Before this time, you had computers of varying numbers of CPUs. It was conceived that you might have clusters of computers, but nothing on today's scale. Besides, the guys who dreamt up MPI were computer scientists, ie, not hardware guys or systems guys. MPI-2, which has the ability to spawn and connect to separate MPI instances, doesn't make this easy.
Search for MPI-2 libraries that support process/communication attachment/detachment. You might find something there. Please post back if you do.
UPDATE: See this PDF/slide presentation
http://www.cs.utk.edu/~dongarra/WEB-...2-features.pdf
Search for "Process Management". You use "MPI_COMM_SPAWN" to create a new set of processes with the same arguments on the command line, but now you must use an "INTERcommunicator" (instead of INTRA); you can do MPI_SEND/MPI_RECV, but not collective functions. Still, if a node dies, this doesn't help!! You would basically need to create your own process and communication management on top of MPI. That's why I suggest you look for a library.
Last edited by otheus; 04-27-2009 at 01:24 PM..
Reason: update
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LEARN ABOUT REDHAT
mpi_get_version
MPI_Get_version(3) LAM/MPI MPI_Get_version(3)
NAME
MPI_Get_version - obtain the version number of MPI that LAM/MPI supports
SYNOPSIS
#include <mpi.h>
int
MPI_Get_version(int *version, int *subversion)
OUTPUT PARAMETERS
version
- version number
subversion
- subversion number
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.
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/
LOCATION
getversion.c
LAM
/MPI 6.5.8 11/10/2002 MPI_Get_version(3)