[Mpi3-rma] Call for errata

[Hubert Ritzdorf]

Hi Jim,

you are right. Datatypes created by MPI_TYPE_CREATE_F90_{INTEGER,REAL,COMPLEX}
are defined as predefined nevertheless they are handles. MPI_WCHAR was only a joke to
a previous discussion.

I think ticket 355 doesn't clarify this. It doesn't specify that target_count items of target_datatype
are transferred if MPI_NO_OP is specified. It says only something about (minimal/maximal) size of buffers
nothing about the items transferred and is independent of MPI_NO_OP. 
You could interpret it that always target_count items of target_datatype are returned to 
the result buffer independent on origin_count and origin datatype (even if op is not MPI_NO_OP).

I think that it is much more clear for the reader if ticket 250 specifies:

When MPI_NO_OP is specified as the operation, the origin buffer arguments are ignored
and target_count elements of type target_datatype are returned from the buffer at offset target_disp
to result buffer result_addr.

Best regards

Hubert
 
________________________________________
From: mpi3-rma-bounces at lists.mpi-forum.org [mpi3-rma-bounces at lists.mpi-forum.org] on behalf of Jim Dinan [dinan at mcs.anl.gov]
Sent: Monday, January 28, 2013 11:51 PM
To: mpi3-rma at lists.mpi-forum.org
Subject: Re: [Mpi3-rma] Call for errata

Hi Hubert,

Please correct me if I'm wrong, but as far as I can tell, every type
that is internal to the MPI implementation (including Fortran and pair
types) are "predefined".

The F90 types are described as predefined in the standard (pg. 617-618).

MPI_WCHAR is also predefined (pg. 665).

Tables 3.x say "predefined" in the table caption.

This wording was copied from the original MPI_Accumulate text in MPI
2.2, so if predefined is not all-encompassing, we may not be able to fix
this as an erratum.

Re: Ticket 350 -- I think we fixed this with ticket 355.  Could you take
a look at that ticket and see if this clears up your concerns?

https://svn.mpi-forum.org/trac/mpi-forum-web/ticket/355

Thanks for your detailed feedback!
  ~Jim.

On 1/28/13 1:04 PM, Hubert Ritzdorf wrote:
> Hi,
>
> Page 429, Line 41-42 specifies for MPI_Fetch_and_op:
>
> The datatype argument must be a predefined datatype.
>
> I think it should be:
>
> The datatype argument must be a predefined or MPI basic datatype (cf. Section 5.9.2 on page 176).
>
> Reasons:
>
> (*) This would be consistent to the reduce functions and MPI_Compare_and_swap
>        and would allow handles returned by MPI_TYPE_CREATE_F90_INTEGER,
>        MPI_TYPE_CREATE_F90_REAL, or MPI_TYPE_F90_COMPLEX.
>        (which are currently excluded since they are not predefined).
>
> (*) MPI_Compare_and_swap accepts handles created by
>        MPI_TYPE_CREATE_F90_INTEGER (they are contained in Fortran integer category).
>
> (*) This proposed change support also atomic gets of MPI_WCHAR.
>
>
> Additionally, on   Page 430, Line 39:
>                 predefined datatypes
> should be replaced by
>                 basic datatypes
> since Section 5.9.2 defines the  MPI basic datatypes and not the predefined
> datatypes (which are defined in Tables 3.x).
>
> Ticket 350 (MPI_NO_OP in new accumulate functions, origin buffer arguments are ignored) should also
> state that the number of entries transferred is defined by target_count
>
> Hubert
>
> ________________________________________
> From: mpi3-rma-bounces at lists.mpi-forum.org [mpi3-rma-bounces at lists.mpi-forum.org] on behalf of Jim Dinan [dinan at mcs.anl.gov]
> Sent: Monday, January 28, 2013 4:54 PM
> To: MPI 3.0 Remote Memory Access working group
> Subject: [Mpi3-rma] Call for errata
>
> Hi All,
>
> We are assembling the list of RMA errata to be voted on at the March
> meeting.  Currently, we have tickets #347, #348, #350, and #355 (I'm
> working on official wording for these changes and will circulate it soon).
>
> Are there any other errata items that should be included on the agenda
> for the upcoming meeting?
>
> Thanks,
>    ~Jim.
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