I have a mongodb server running v3.2.11 with a memory comsumption much higher than what I configured on cacheSizeGB.

Currently it is using 3.9g but the cacheSizeGB parameter is configured with 1 (1g).

I expected to be a little bit over 1g due to active connections and other stuff but right now is almost 4x that and seems to be increasing.

The huge pages are disabled:

grep AnonHugePages /proc/meminfo          
AnonHugePages:         0 kB

cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise [never]

I'm running CentOS

uname -a
Linux XXXXXX 2.6.32-642.el6.x86_64 #1 SMP Tue May 10 17:27:01 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

cat /etc/redhat-release 
CentOS release 6.8 (Final)

I attached the information that I was able to collect:

• top
• serverStatus
• mongostat
• mongo_oms_1.conf --> the configuration file

Is this a normal behaviour? There is other way that I can use to limit the memory used by the mongodb process?