[MPICH] Stopping processors?

[Harrison, Robert J.]

Unless you are willing to step outside of MPI and use system-dependent
interrupts, you've got no choice but to have each process poll at regular
intervals for a message indicating completion.  

 
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From: owner-mpich-discuss at mcs.anl.gov on behalf of Michaela Heyer
Sent: Tue 4/24/2007 10:21 AM
To: mpich-discuss at mcs.anl.gov
Subject: [MPICH] Stopping processors?



Hi,
I'm hoping someone can help me with this...
Essentially I'm looking for a way to tell one or more processors to stop
whatever they are currently doing and move on to something else. The
situation is as follows: Let's say we have n processors all working on
different algorithms. I only really need the result of one of these
algorithms so whichever processor finishes first should tell all the other
ones to stop so they can all move on to the next problem. It's a bit like a
race...and speed is vital! (That's why I can't really wait for all processors
to finish their algorithms)
At the moment I'm using MPI_Abort() to shutdown the whole process. This works
fine and does exactly what I need but the problem is that it is very very
slow as it shuts down and restarts all the processors. So what I'm looking
for is something like a "milder" version of MPI_Abort() i.e. stop everything
but don't shutdown the processors.
I have been looking but can't find anything sutitable so I'm starting to think
that maybe it's impossible? It would be great if you could prove me wrong :-)
Thanks,
Michaela