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Full Discussion: MPI, recovering node
Special Forums UNIX and Linux Applications High Performance Computing MPI, recovering node Post 302310950 by otheus on Monday 27th of April 2009 12:00:53 PM
Old 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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MPI_Type_c2f(3) 						      LAM/MPI							   MPI_Type_c2f(3)

NAME
MPI_Type_c2f - Convert a datatype handle from its C representation to its Fortran representation SYNOPSIS
#include <mpi.h> MPI_Fint MPI_Type_c2f(MPI_Datatype datatype) INPUT PARAMETER
datatype - C datatype handle RETURN VALUE
f_handle - Fortran datatype handle 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
This function does not return the normal MPI_SUCCESS integer value upon success. Instead, it returns a handle to the converted object. If an error occurs, the appropriate NULL handle will be returned. SEE ALSO
MPI_Type_c2f(3) 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
handles.c LAM
/MPI 7.1.4 6/24/2006 MPI_Type_c2f(3)
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