sqrt(2^31)/log(sqrt(2^31))*(1+1.2762/log(sqrt(2^31)))/1024 * 4byte = 18,850133965051 kbyte should do it. ;) Amazing - I think our systems are still *too small* - lets go for MPI with int64 types. ^^
----- Ursprüngliche Mail ----- Von: "Jeff Squyres (jsquyres)" <jsquy...@cisco.com> An: "Open MPI Developers" <de...@open-mpi.org> Gesendet: Dienstag, 11. Februar 2014 01:32:53 Betreff: Re: [OMPI devel] Reviewing MPI_Dims_create On Feb 10, 2014, at 7:22 PM, Christoph Niethammer <nietham...@hlrs.de> wrote: > 2.) Interesting idea: Using the approximation from the cited paper we should > only need around 400 MB to store all primes in the int32 range. Potential for > applying compression techniques still present. ^^ Per Andreas' last mail, we only need primes up to sqrt(2B) + 1 more. That *has* to be less than 400MB... right? sqrt(2B) = 46340. So the upper limit on the size required to hold all the primes from 2...46340 is 46340*sizeof(int) = 185,360 bytes (plus one more, per Andreas, so 185,364). This is all SWAGing, but I'm assuming the actual number must be *far* less than that... -- Jeff Squyres jsquy...@cisco.com For corporate legal information go to: http://www.cisco.com/web/about/doing_business/legal/cri/ _______________________________________________ devel mailing list de...@open-mpi.org http://www.open-mpi.org/mailman/listinfo.cgi/devel
