Fascinating deep dive on Twitch deliberately constructing a 10GiB array to reduce the number of GC cycles in Go: https://blog.twitch.tv/en/2019/04/10/go-memory-ballast-how-i-learnt-to-stop-worrying-and-love-the-heap/
(This trick is no longer necessary in the new Go 1.19 apparently, as it's added a GOMEMLIMIT environment variable.)