On Mar 11 2011, Eugene Loh wrote:
>The idea would be to hardwire support for MPI_THREAD_MULTIPLE to be off,
>just as we have done for progress threads. Threads might still be used
>for other purposes -- e.g., ORTE, openib async thread, etc.
That's what I was assuming, too. Threads used behind the scene are not
a problem - IF you can solve the infernal synchronisation and signalling
problems and stop them causing trouble in other ways!
Whether this should be done for MPI_THREAD_SERIALIZED, too, is debatable,
but it can't be done using a cautious interpretation of any published
standards that I know of, and in my experience can't be done reliably.
That's not nice, and I don't want to go there :-(