[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 #7 from Florian Weimer <fweimer at redhat dot com> ---
I cannot reproduce this with the -192 glibc.  Can you provide lscpu output from
your test machine?

I tried your reproducer on:

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                24
On-line CPU(s) list:   0-23
Thread(s) per core:    2
Core(s) per socket:    6
Socket(s):             2
NUMA node(s):          2
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 63
Model name:            Intel(R) Xeon(R) CPU E5-2620 v3 @ 2.40GHz
Stepping:              2
CPU MHz:               1200.000
BogoMIPS:              4788.56
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              15360K
NUMA node0 CPU(s):     0-5,12-17
NUMA node1 CPU(s):     6-11,18-23


And:

Architecture:          x86_64
CPU op-mode(s):        32-bit, 64-bit
Byte Order:            Little Endian
CPU(s):                240
On-line CPU(s) list:   0-239
Thread(s) per core:    2
Core(s) per socket:    15
Socket(s):             8
NUMA node(s):          8
Vendor ID:             GenuineIntel
CPU family:            6
Model:                 62
Model name:            Intel(R) Xeon(R) CPU E7-8890 v2 @ 2.80GHz
Stepping:              7
CPU MHz:               1200.000
BogoMIPS:              5585.84
Virtualization:        VT-x
L1d cache:             32K
L1i cache:             32K
L2 cache:              256K
L3 cache:              38400K
NUMA node0 CPU(s):     0-14,120-134
NUMA node1 CPU(s):     15-29,135-149
NUMA node2 CPU(s):     30-44,150-164
NUMA node3 CPU(s):     45-59,165-179
NUMA node4 CPU(s):     60-74,180-194
NUMA node5 CPU(s):     75-89,195-209
NUMA node6 CPU(s):     90-104,210-224
NUMA node7 CPU(s):     105-119,225-239

The latter limited to 192 arenas with MALLOC_ARENA_MAX=192.

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