A fascinating test... 1) Allocate a pile of memory and touch every page. 2) Fork a couple hundred child processes. 3) Each child makes a unique directory and chdir's to it. 4) Each child Dumps Core. It's not torture if you do it to yourself for fun. (You might be considered a bit of a perv if you do it in a softdep filesystem) Such testing finds considerable memory, midlayer, and scheduler issues.