On Jun 22, 2009, at 12:08 PM, Lionel, Steve wrote:

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But I can also see that it would be a PITA for programmers to have to specify *every* argument to MPI functions, and potentially have to translate between their MPI-argument-variables and non-MPI-argument- variables. Shrug.

No - programmers do NOT have to do this just because kinds are specified. If default integer happens to match the declared kind, it will just work without coding changes. If programmers want to use the kinds, they can, and would be encouraged to, but it is not required.

If an MPI implementation uses MPI_TAG_KIND for MPI message tags that are 4 bytes and are the same as default INTEGERs, then I can understand the logic here. But what if a user compiles a code that uses INTEGERs where INTEGER(MPI_TAG_KIND) parameters are expected with "ifort - i8" (transmorgifying default INTEGERs to be 8 bytes)? Will their code refuse to compile? If so, do users expect / compensate for this kind of behavior? -- Jeff Squyres Cisco Systems