Hi Jorge, You can try the debug event logging described in https://wiki.mpich.org/mpich/index.php/Debug_Event_Logging. Regards, Sangmin On Jul 26, 2016, at 11:57 AM, Jorge Bellón <[email protected]<mailto:[email protected]>> wrote: 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 WARNING / LEGAL TEXT: This message is intended only for the use of the individual or entity to which it is addressed and may contain information which is privileged, confidential, proprietary, or exempt from disclosure under applicable law. If you are not the intended recipient or the person responsible for delivering the message to the intended recipient, you are strictly prohibited from disclosing, distributing, copying, or in any way using this message. If you have received this communication in error, please notify the sender and destroy and delete any copies you may have received. http://www.bsc.es/disclaimer _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss