MySQL 5.7 + Ubuntu 14.04 eating up my RAM

Question

I've recently installed MySQL 5.7.11 in my Ubuntu 14.04.3 system following these instructions: http://dev.mysql.com/doc/mysql-apt-repo-quick-guide/en/

Being totally empty and not being called by any other program, it always ramps up RAM usage in a couple of hours until I can't start Node apps because of low memory (ENOMEM). I first assumed it to be because I'm running on a 768MB VPS, so I tweaked my.cnf, using some very low parameters, but it kept behaving like that, eating up more than 600MB of RAM after a couple of hours.

Please notice that it's really taking up all that RAM, it's not some buffer/cache voodoo, because it stops other programs from starting. Or am I wrong here?

Just uninstalled everything and reinstalled MySQL 5.6 and this problem isn't happening. Can anyone lend me a hand here? Am I doing something wrong or is this some kind of bug?

Thanks!

Answer 1

It's not your configuration; it's caused by the bug Excessive memory used in memory/innodb/os0file starting 5.7.8.

It is tracked in Ubuntu as Excessive consumption RAM of mysqld daemon in Ubuntu 16.04, and there is also a discussion on Reddit.

Answer 2

MySQL 5.7.13 is OK

I was suffering from this problem. Same as you described: MySQL 5.7.11 with almost empty database and few requests in hour was eating memory up to 450MB.

So I've recently tried new version and it is totally OK. MySQL 5.7.13 instance is running for a week already and it takes only 73MB.

Also I've turned off performance schema in my.cnf:

            [mysqld]
            performance_schema=0