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. 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, [email protected], http://people.llnl.gov/schulzm CASC @ Lawrence Livermore National Laboratory, Livermore, USA

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