[defen]

Are the lessons here applicable to other commonly used databases (mongo, postgres, redis, etc)?

[wmf]

This applies to any case where you want a single process to use more than half the server's RAM.

[jeremycole]

Yes, absolutely. In fact one of the most common longer term referrers for that post is about MongoDB, not MySQL:

http://www.mongodb.org/display/DOCS/NUMA