[mpich-discuss] Error code for MPI_Type_commit and free

[Junchao Zhang]

It is because MPICH auto-generates manpage's explanation based on error
codes  tagged on each MPI routine.
A generic explanation is applied to all routines with the same error code.
So you can even see "May be an uncommitted MPI_Datatype (see MPI_Type_commit)."
 in manpage of MPI_Type_commit".

--Junchao Zhang

On Fri, Dec 5, 2014 at 9:16 AM, Junchao Zhang <jczhang at mcs.anl.gov> wrote:

> 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 at 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 at grs-sim.de
>>
>>
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