# out of memory with plenty of memory

**URL:** <https://forums.percona.com/t/out-of-memory-with-plenty-of-memory/5528>\
**Category:** Percona Server for MySQL 5.6\
**Created:** [April 6, 2017, 9:29am UTC](https://forums.percona.com/t/out-of-memory-with-plenty-of-memory/5528 "2017-04-06T09:29:24Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![tch](https://avatars.discourse-cdn.com/v4/letter/t/e95f7d/32.png) [@tch](https://forums.percona.com/u/tch)\
**Post date:** [April 6, 2017, 9:29am UTC](https://forums.percona.com/t/out-of-memory-with-plenty-of-memory/5528/1 "2017-04-06T09:29:24Z")

</div>

I have a busy server running Percona 5.6.34-79.1-1.xenial on Ubuntu 16.04. It works great, however, every few weeks, mysqld is shot by out-of-memory killer and I’m not able to find out why.

root@master02:~# grep Out /var/log/syslog  
Apr 6 13:37:03 master02 kernel: [17420955.874564] Out of memory: Kill process 36138 (mysqld) score 659 or sacrifice child

So it was killed at 13:37:03.

However, just 2 seconds before, it was using around 110 GB RAM (the system has ~160 GB RAM), with some 55 GB free:

root@master02:~# cat /root/logs/free/free-2017-04-06-13:36:01.log  
total used free shared buff/cache available  
Mem: 165050752 109560372 593508 189240 54896872 54434632  
Swap: 0 0 0

root@master02:~# cat /root/logs/free/free-2017-04-06-13:37:01.log  
total used free shared buff/cache available  
Mem: 165050752 109582416 602704 189624 54865632 54412072  
Swap: 0 0 0

root@master02:~# cat /root/logs/free/free-2017-04-06-13:38:01.log  
total used free shared buff/cache available  
Mem: 165050752 17982728 92226488 189200 54841536 146007904  
Swap: 0 0 0

my.cnf has “innodb-buffer-pool-size = 130G” set.