Dear Bill, Thanks. I would agree with you on that subsets are indeed not required, but their clear definition in the standard would promote equally clear and uniform implementation of the memory footprint minimizing approaches you and Dick referred to. I guess static linkage is the easiest case for this, as the linkers are smart enough nowadays to load only the required parts of the library, provided it's appropriately structured. Again, subsets may promote such a structuring. Best regards. Alexander ________________________________ From: mpi-22-bounces_at_[hidden] [mailto:mpi-22-bounces_at_[hidden]] On Behalf Of William Gropp Sent: Friday, May 09, 2008 2:32 PM To: MPI 2.2 Subject: Re: [Mpi-22] Memory footprint concern On the memory footprint issue, I'd like to add that it is possible to structure an MPI implementation to only require the code associated with the routines that are used in the application, even when the application must be statically linked (as is the case for Blue Gene/L, for example). This can be done even if there are actions that the application needs or wants to perform at the time of MPI_Finalize. There are some things that can be done to make this easier for the implementation, but (like Dick) I'm not convinced that a subset is required as a way to limit the memory footprint. Bill William Gropp Paul and Cynthia Saylor Professor of Computer Science University of Illinois Urbana-Champaign --------------------------------------------------------------------- Intel GmbH Dornacher Strasse 1 85622 Feldkirchen/Muenchen Germany Sitz der Gesellschaft: Feldkirchen bei Muenchen Geschaeftsfuehrer: Douglas Lusk, Peter Gleissner, Hannes Schwaderer Registergericht: Muenchen HRB 47456 Ust.-IdNr. VAT Registration No.: DE129385895 Citibank Frankfurt (BLZ 502 109 00) 600119052 This e-mail and any attachments may contain confidential material for the sole use of the intended recipient(s). Any review or distribution by others is strictly prohibited. If you are not the intended recipient, please contact the sender and delete all copies. *