We updated docker recently and got really high RAM usage in the integration tests.
Atop shows that MySQL eats 20GB for no reason. All mysql server metrics was okey.
This problem was really painful to debug, since we thought “how docker can even affect how mysqld use memory, it might be something else”
Related: https://bugs.mysql.com/bug.php?id=96525
https://github.com/docker-library/mysql/issues/579
https://www.mail-archive.com/ubuntu-bugs@lists.ubuntu.com/ms...
https://github.com/moby/moby/issues/44547#issuecomment-13340...