Dear MPICH team, I just recently stumbled over the MPICH manpage for MPI_Type_commit and MPI_Type_free. In the description of MPI_ERR_TYPE it states: "MPI_ERR_TYPE Invalid datatype argument. May be an uncommitted MPI_Datatype (see MPI_Type_commit). " What is meant by an uncommitted MPI_Datatype? As far as I know, MPI_Type_free should be callable on uncommitted datatypes. So why is there this reference to the commit state? Cheers, Marc-Andre -- Marc-Andre Hermanns Jülich Aachen Research Alliance, High Performance Computing (JARA-HPC) German Research School for Simulation Sciences GmbH Schinkelstrasse 2 52062 Aachen Germany Phone: +49 241 80 99753 Fax: +49 241 80 6 99753 www.grs-sim.de/parallel email: [email protected] _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss