[Mpi-forum] MPI_ERR_UNSUPPORTED_DATAREP error class definition scoped too tightly

[Rajeev Thakur]

Even if we remove the reference to File_set_view, people may not expect non-I/O functions to return any of those error classes. It is located in the I/O chapter, the section title is "I/O Error Classes", and the first line of the section is "The implementation dependent error codes returned by the I/O routines can be converted into the error classes defined in Table 13.3." 

There is another error class there that could be used elsewhere:

MPI_ERR_NOT_SAME  - Collective argument not identical on all processes, or collective routines called in a different order by different processes

Rajeev


On Mar 13, 2014, at 5:08 PM, Fab Tillier <ftillier at microsoft.com> wrote:

> Ok, how about removing the reference to MPI_FILE_SET_VIEW, then?
> 
> I'd like to return MPI_ERR_UNSUPPORTED_DATAREP as the error class in MPI_PACK_* functions for that case, and the current text kind of prohibits that.
> 
> We can then rationalize the location of error classes in MPI-4.
> 
> -Fab
> 
> Rajeev Thakur wrote on Thu, 13 Mar 2014 at 12:52:44
> 
>> The table on pg 551 is about I/O error codes and classes. So
>> Pack_external/Unpack_external (from 9 chapters away) would look out of
>> place there. The real solution might be to move the I/O error codes
>> and classes from the I/O chapter to the chapter on error codes and
>> classes, but that would be more than a ticket 0 change.
>> 
>> Rajeev
>> 
>> 
>> 
>> On Mar 13, 2014, at 12:02 PM, Fab Tillier <ftillier at microsoft.com> wrote:
>> 
>>> Hi folks,
>>> 
>>> The standard defines MPI_ERR_UNSUPPORTED_DATAREP as an I/O error
>> class, with the meaning "Unsupported datarep passed to
>> MPI_FILE_SET_VIEW".  However, datareps are also passed as input to
>> MPI_PACK_EXTERNAL and MPI_UNPACK_EXTERNAL.  Shouldn't these functions
>> use the same error class for unsupported datareps, rather than
>> MPI_ERR_ARG?
>>> 
>>> Can we update the description of MPI_ERR_UNSUPPORTED_DATAREP
>> (page 551, line 10) to also include MPI_PACK_EXTERNAL and
>> MPI_UNPACK_EXTERNAL as a ticket-0 item for MPI 3.1, or will this need
>> to happen in a later version?
>>> 
>>> Thanks,
>>> -Fab
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