There appears to be a bug relating to this on launchpad, so I've added my report as well. Thanks to the list for helping me figure this out! Marcus <div class="gmail_quote">On Wed, Feb 3, 2010 at 3:18 PM, Dan Nicholson <<a href="mailto:dbn.lists@gmail.com">dbn.lists@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="im">On Wed, Feb 3, 2010 at 9:35 AM, Marcus Rademacher <<a href="mailto:endingpop@gmail.com">endingpop@gmail.com</a>> wrote: > It lists x-nautilus-desktop at the top with 2257K, then two more entries > that are <unknown> with 2250K in use each. </div>That would seem to make sense since a program just creating directories/files and deleting them would have no effect on bare X. Nautilus is either leaking when this happens or maybe keeping a massive cache since it monitors file usage. I'd bet the leak goes away if you try running your program without GNOME. E.g., run startx with just an xterm and launch your program from there. If the problem is nautilus leaking, you'll have to file a bug in the gnome or ubuntu trackers. -- Dan </blockquote></div>