Experiencing occasional long garbage collection delays, why?

Question

I\'m having a hard time dealing with a Java garbage collection problem, and interpreting the logs.

My application requires that no GC takes longer than 2 seconds, and id

Answer 1

Turns out the problem was that the heap was getting swapped out to disk, and the delay was Java's GC having to wait for it to be swapped back in.

Solved (mostly) by setting Linux' "swappiness" parameter to 0.