Open MPI's fault tolerance is still somewhat rudimentary; it's a complex topic
within the entire scope of MPI. There has been much research into MPI and
fault tolerance over the years; the MPI Forum itself is grappling with terms
and definitions that make sense. It's by no means a "solved" problem.
It's unfortunately unsurprising that Open MPI may hang in the case of a node
crash. I wish that I had a better answer for you, but I don't. :-\
On Sep 24, 2010, at 3:36 AM, Olivier Riff wrote:
> Hello,
>
> My question concerns the display of error message generated by a throw
> std::runtime_error("Explicit error message").
> I am launching on a terminal an openMPI program on several machines using:
> mpirun -v -machinefile MyMachineFile.txt MyProgram.
> I am wondering why I cannot see an error message displayed on the terminal
> when one of my distant node (meaning not the node where the terminal is used)
> is crashing. I was expecting that following try catch could also generates a
> display in the terminal:
> try {...My code where a crash happens... }
> {
> throw std::runtime_error( "Explicit error message" );
> }
>
> Generally, my problem is that one of the node crashes and the global
> application waits forever data from this node. On the terminal, nothing is
> displayed indicating that the node has crashed and generated a useful
> information of the crash nature.
>
> ( I don't think these information are relevant here, but just in case: I am
> using openMPI 1.4.2, on a Mandriva 2008 system )
>
> Thanks in advance for any help/info/advice.
>
> Olivier
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Jeff Squyres
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