On Jun 20, 2019, at 9:31 AM, Noam Bernstein via users 
<users@lists.open-mpi.org> wrote:
> One thing that I’m wondering if anyone familiar with the internals can 
> explain is how you get a memory leak that isn’t freed when then program ends? 
>  Doesn’t that suggest that it’s something lower level, like maybe a kernel 
> issue?

If "top" doesn't show processes eating up the memory, and killing processes 
(e.g., MPI processes) doesn't give you memory back, then it's likely that 
something in the kernel is leaking memory.

Have you tried the latest version of UCX -- including their kernel drivers -- 
from Mellanox (vs. inbox/CentOS)?

Jeff Squyres

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