[Mpi3-tools] Standardized MPI_COMM_WORLD rank environment variable?
bosilca at eecs.utk.edu
Tue Apr 24 17:30:58 CDT 2012
MCW is only meaningful in a static world. I'm not a tool expert, but I do not recall hearing about any tools that can cope with a dynamic environment where multiple MCW coexist in the context of the same application (and such application do exist).
What would be a "reasonable" unique identifier in this context?
On Apr 24, 2012, at 18:01 , Jeffrey Squyres wrote:
> On Apr 24, 2012, at 5:36 PM, Dries Kimpe wrote:
>>> Any kind of unique value would allow the tool to have a unique, safe filename.
>> What about a tmpnam for MPI then :-)
>> No need to bring details like rank->thread->process mapping into this if
>> all you want is a guaranteed unique filename among the MPI ranks of the
> You do want it to be able to be mapped back to individual MPI (and/or OS) processes, though. MCW rank is a pretty easy way to identify things.
> If it weren't for this desire, PID would be sufficient. But users find it to be a PITA to map PID back to whatever MCW rank it was. That's why tools are looking for MPI-specific information that is meaningful to the user.
> FWIW: Also add Valgrind to the list of tools that Rayson mentioned (there's an option to suffix the valgrind output files with the MCW rank).
> Jeff Squyres
> jsquyres at cisco.com
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