[mpich-discuss] MPI_Comm_disconnect and pending communications

[Jorge Bellón]

Hi,
I am currently working with dynamic process creation with MPI using
MPI_Comm_spawn_multiple.

However, I'm facing issues during the application cleanup:
MPI_Comm_disconnect function is hung and does not ever return (it is
being called by all the processes involved in the intercommunicator).

I know this issue could happen when there are unfinished communications
(this has already happened to me in the past), in a similar way
MPI_Finalize waits until all the communications in all the
communicators are completed.

This time, though, I'm not able to track which communications haven't
finished yet. I was able to trace all the calls to the library using
gdb and breakpoints, but everything seems OK to me.

Is there any way to log the start and arrival of the messages (maybe
using configure "--enable-g" option or setting one of the environment
variables)?

Thanks in advance.

Regards,
 Jorge

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