MPI dies

[Horatio B. Bogbindero]

what happens if a node in MPI dies? is the entire computation lost?

---------------------
willia...@ieee.org

I bought some used paint. It was in the shape of a house.
-- Steven Wright

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[Tony Skjellum]

There are some efforts to build fault tolerating MPI's, but standard
MPI-1.x is supposed to kill the parallel application if a node dies,
or else the underlying system must transparently solve the fault.

Anthony Skjellum, PhD, President (to...@mpi-softtech.com)
MPI Software Technology, Inc., Ste. 33, 101 S. Lafayette, Starkville, MS 39759
+1-(662)320-4300 x15; FAX: +1-(662)320-4301; http://www.mpi-softtech.com
"Best-of-breed Software for Beowulf and Easy-to-Own Commercial Clusters."

[Victor Karyo]

Is there a technique to handle node failure? Shortly, I'll be working on an
that algorithm is naturally parallel and divided into course-grain "blocks".
I want to use a master/worker scheme. The master is to be set to reissue
blocks if the block doesn't return from the worker fast enough on the
assumption the node has failed. I know I can't rejoin a node after it
fails, but if the node fails will the whole app die?

Also, is there a way to detect the number of nodes other than at
initialization, so I can tell if a node has died?

(I plan on using MPI-Pro on a RH6.2 8-way single-proc Intel cluster with
100mbps switched ethernet.)

Thanks
Victor Karyo.

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