I just filed it: http://svn.open-mpi.org/trac/ompi/ticket/363
On 9/11/06 7:31 PM, "Graham E Fagg" <f...@cs.utk.edu> wrote: > Hi Christian, do you have the ticket #, I just looked and didn't see it > listed... > > G. > > On Tue, 12 Sep 2006, Christian Siebert wrote: > >> Hi, >> >> I stumbled across a serious bug in the tuned component of Open MPI, >> which crashes for example the well-known HPL benchmark in conjunction >> with the "native MPI_Bcast() patch" [1]. >> >> The problem is within the function ompi_coll_tuned_bcast_intra_chain(), >> which does mainly the following: >> >> ompi_ddt_type_size( datatype, &typelng ); >> segcount = segsize / typelng; >> num_segments = count / segcount; >> >> Whenever you have a constructed type with a size larger than 'segsize' >> (16384), you'll get a 'seqcount' of zero and finally a division by zero. >> >> Happy fixing! >> >> Christian >> >> [1] http://www-user.tu-chemnitz.de/~chsi/hpl/ >> >> >> _______________________________________________ >> devel mailing list >> de...@open-mpi.org >> http://www.open-mpi.org/mailman/listinfo.cgi/devel >> > > > Thanks, > Graham. > ---------------------------------------------------------------------- > Dr Graham E. Fagg | Distributed, Parallel and Meta-Computing > Innovative Computing Lab. PVM3.4, HARNESS, FT-MPI, SNIPE & Open MPI > Computer Science Dept | Suite 203, 1122 Volunteer Blvd, > University of Tennessee | Knoxville, Tennessee, USA. TN 37996-3450 > Email: f...@cs.utk.edu | Phone:+1(865)974-5790 | Fax:+1(865)974-8296 > Broken complex systems are always derived from working simple systems > ---------------------------------------------------------------------- > _______________________________________________ > devel mailing list > de...@open-mpi.org > http://www.open-mpi.org/mailman/listinfo.cgi/devel -- Jeff Squyres Server Virtualization Business Unit Cisco Systems
