I installed Ubuntu 12.04.5 (64 bit) on a Dell T5500 with two Xeon 5650 6-core processors specifically to run the free DCP-o-matic software (http://dcpomatic.com/). The same machine used all 24 virtual cores before under Windows 7 Professional 64 bit, but I was just not happy with that OS.
Under Ubuntu the performance was less than 1/10 of what I had experienced under Windows. I next upgraded to 14.04.2 but to no avail. Monitoring the resources makes it clear that the processors are throttled down after reaching their peak performance. The pattern looks like saw teeth.
Here is a screenshot
What can I do to achieve maximum performance? Any help is very much appreciated!