Hello Emmanuel, Which version of Open MPI are you using?
Howard 2017-03-28 3:38 GMT-06:00 BRELLE, EMMANUEL <emmanuel.bre...@atos.net>: > Hi, > > We are working on a portals4 components and we have found a bug (causing > a segmentation fault ) which must be related to the coll/basic component. > Due to a lack of time, we cannot investigate further but this seems to be > caused by a “free(disps);“ (around line 300 in coll_basic_reduce_scatter) > in some specific situations. In our case it happens on a > osu_reduce_scatter (from the OSU microbenchmarks) with at least 97 procs > for sizes bigger than 512Ko > > Step to reproduce : > export OMPI_MCA_mtl=^portals4 > export OMPI_MCA_btl=^portals4 > export OMPI_MCA_coll=basic,libnbc,self,tuned > export OMPI_MCA_osc=^portals4 > export OMPI_MCA_pml=ob1 > mpirun -n 97 osu_reduce_scatter -m 524288: > > ( reducing the number of iterations with –i 1 –x 0 should keep the bug) > Our git branch is based on the v2.x branch and the files differ almost > only on portals4 parts. > > Could someone confirm this bug ? > > Emmanuel BRELLE > > > > > _______________________________________________ > devel mailing list > devel@lists.open-mpi.org > https://rfd.newmexicoconsortium.org/mailman/listinfo/devel >
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