To completely disable UCX you need to disable the UCX MTL and not only the BTL. I would use "--mca pml ob1 --mca btl ^ucx —mca btl_openib_allow_ib 1".
As you have a gdb session on the processes you can try to break on some of the memory allocations function (malloc, realloc, calloc). George. On Wed, Jun 19, 2019 at 2:37 PM Noam Bernstein via users < users@lists.open-mpi.org> wrote: > I tried to disable ucx (successfully, I think - I replaced the “—mca btl > ucx —mca btl ^vader,tcp,openib” with “—mca btl_openib_allow_ib 1”, and > attaching gdb to a running process shows no ucx-related routines active). > It still has the same fast growing (1 GB/s) memory usage problem. > > > Noam > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users
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