PostgreSQL and the OOM Killer: Why We Use Strict Memory Overcommit (ubicloud.com)

The author of the blog post here.

In hindsight, the kernel bug seems obvious, but the process of tracking it down was quite interesting. I especially enjoyed the statistical analysis part, which isn't something you normally get to do while debugging :)

Anyway, I'd be happy to answer any questions you might have.

we recently ran into trouble where PGroonga on the other hand needs overcommit enabled, in direct opposition to postgres preferences: https://pgroonga.github.io/how-to/tuning.html