I think it is an oversight.  MPI_Type_free in MPICH is ok with uncommitted datatypes. I will correct it. 

Thanks.

--Junchao Zhang

On Fri, Dec 5, 2014 at 8:04 AM, Marc-Andre Hermanns <m.a.hermanns@grs-sim.de> wrote:

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: m.a.hermanns@grs-sim.de

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