Yalu

After the last update (which added caching to the who is online widget if I'm not mistaken) I tried to re-enable the widget and ran into the same problems after 2 days. Had to disable it again and truncate core_sessions or mysql would be stuck at 100% CPU. Memcached is set up and enabled for caching on the system settings.

Same problem, after running without a hitch for several years. I have memcached enabled now but don't think it's used for session storage, so it didn't seem to help. 1883 rows in core_sessions I will try truncating soon but I don't think it's a great or long-term solution.