[Mpi3-tools] Type sizes in MPI_T

[Martin Schulz]

Hi Bill,

On Jun 23, 2011, at 11:52 PM, William Gropp wrote:

> Martin,
> 
> Possible refers to the values (and that there are other choices,  
> including the derived types); sizeof may be used for the basic types  
> instead of MPI_Type_size.

That's what we thought/hoped, but we weren't fully sure.
Thanks for the clarification,

Martin


> 
> Bill
> 
> On Jun 23, 2011, at 9:39 PM, Martin Schulz wrote:
> 
>> Hi all,
>> 
>> Christof has been going over the MPI_T document (thanks!) and
>> found a few issues - I will fix those and post a new draft tonight.
>> 
>> One issue, however, we were not sure about: since we are
>> not allowing any MPI calls between MPI_T_Init_thread and
>> MPI_Init (only MPI_T calls), we also cannot call any MPI
>> Type related calls, such as MPI_Type_size or calls for
>> naming or setting attributes. The latter we can probably
>> get away with not having until MPI_Init, but we were not sure
>> on MPI_Type_size.
>> 
>> Since we are only using basic types, can we assume that they
>> always represent their corresponding C types as specified in
>> Section 3.2.2? I always assumed this, but looking closer, we
>> were not 100% certain on how to interpret the following sentence
>> in that section:
>> 
>> Possible values for this argument for C and the corresponding
>> C types are listed in Table 3.2.
>> 
>> Does the possible only refer to the values or also to the
>> corresponding C types? If it is the former, then we can get
>> the size simply by calling sizeof(...) and  this is not an
>> issue.
>> 
>> Thanks,
>> 
>> Martin
>> 
>> 
>> ________________________________________________________________________
>> Martin Schulz, schulzm at llnl.gov, http://people.llnl.gov/schulzm
>> CASC @ Lawrence Livermore National Laboratory, Livermore, USA
>> 
>> 
>> 
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> 
> William Gropp
> Director, Parallel Computing Institute
> Deputy Director for Research
> Institute for Advanced Computing Applications and Technologies
> Paul and Cynthia Saylor Professor of Computer Science
> University of Illinois Urbana-Champaign
> 
> 
> 
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________________________________________________________________________
Martin Schulz, schulzm at llnl.gov, http://people.llnl.gov/schulzm
CASC @ Lawrence Livermore National Laboratory, Livermore, USA