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Re: MPI debugging support in GDB?


> > If you know, could you say something about what kind of support would be
> > needed?? Even that would help a bit, I think.
> 
> I think that for full and transparent support, we'd need to start with
> being able to debug multiple (remote) targets simultaneously?? GDB can't
> do that currently --- it can only debug multiple processes running on
> the same host.

Yes, I think this is a hard requirement. I'm also pretty sure that supporting code would be needed for each MPI library implementation (their might have something comparable to libthread_db/nptl_db). OpenMPI is the most prominent open source MPI implementation today, its page might give some additional clues:

http://www.open-mpi.org/faq/?category=debugging

Thanks!






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