On 2 May 2013 18:58, Dave Goodell <[email protected]> wrote:

Thanks for letting us know. I've created a ticket to track this and commented on your suggestions there:

https://trac.mpich.org/projects/mpich/ticket/1833#comment:1

Thanks. BTW, you are right. This was indeed bad API usage from the user. All neighbor collectives should check that the communicator is an INTRAcommunicator with cart|graph|distgraph topology attached and otherwise generate a proper error (of class MPI_ERR_COMM?) -- Lisandro Dalcin --------------- CIMEC (INTEC/CONICET-UNL) Predio CONICET-Santa Fe Colectora RN 168 Km 472, Paraje El Pozo 3000 Santa Fe, Argentina Tel: +54-342-4511594 (ext 1011) Tel/Fax: +54-342-4511169