Too resource hungry
After a few hours of running Tor it uses up all CPU cycles and unusual amount of memory, in the range of 120Mbytes, regardless of traffic condition, which is, at the time of observation 1Kbytes/s.
It is running on Ubuntu 12.10 VPS, and is configured to run as an exit node.
Once the log showed "Error creating network socket: No buffer space available ", even though there is still 300Mbytes of free memory.
Now, attempt to restart, reinstall Tor does not solve the problem.