d21c0027df
Most of this checkin consists of more debugging stuff. Hopefully, you won't see any printf's that aren't protected by debug flags - if you do, let me know and I'll take them out with my apologies. Outside of debugging, the biggest change was a revamp of the shutdown process. For several reasons, we had chosen to have all processes "wait" for a shutdown message before exiting. This message is typically generated by mpirun, but in the case of comm_spawn we needed to do something else. We have decided that the best way to solve this problem is to: (a) replace the shutdown message (which needed to be generated by somebody - usually mpirun) with an oob_barrier call. This still requires that the rank 0 process be alive. However, we terminate all processes if one abnormally terminates anyway, so this isn't a problem (with the standard or our implementation); and (b) have the state-of-health monitoring subsystem issue the call to cleanup the job from the registry. Since the state-of-health subsystem isn't available yet, we have temporarily assigned that responsibility to the rank 0 process. Once the state-of-health subsystem is available, we will have it monitor the job for all-processes-complete and then it can tell the registry to cleanup the job (i.e., remove all data relating to this job). Hope that helps a little. I'll put all this into the design docs soon. This commit was SVN r3754.
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This is the world's greatest MPI.
...more to write here
should be a short file, referring to the real docs.