[Bug libc/20425] unbalanced and poor utilization of memory in glibc arenas may cause memory bloat and subsequent OOM

["fweimer at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=20425

--- Comment #20 from Florian Weimer <fweimer at redhat dot com> ---
(In reply to Sumeet Keswani from comment #17)
> Subsequently we ran the reproducer on glibc-2.22. Here we don’t see this
> "unbalanced and poor utilization", however arenas grows (leak) with each
> iteration which will ultimately result in an OOM.

I ran the reproducer with:

-iters 20 -threads 512 -maxSize 200 -secs 60 -stats

against a glibc 2.22 release version.  For me, memory utilization stabilizes at
around 4.5 GiB after the first few iterations.  I don't know why the ramp-up is
slower in your pthread_arena.exe.out.2.22 log file.  It could be a kernel
difference (I'm on kernel-3.10.0-327.28.2.el7.x86_64).

If you run more iterations, does RSS keep increasing?  It seems to have
plateaued for you as well.

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