Processor Utilization

Out of curiosity ... is it possible to have more than 100% utilization of the CPU 开发者_C百科in a multi-threaded environment?

No, of course not. And any utility which tells you otherwise is lying.

a single CPU core can not be at more than 100% utilization. But on a multi core system most utilities report the sum of the CPU utilization thus numbers above 100% are quite common.

No, this could never happen by definition of cpu utilization. What you may see is the number of runnable processes greater than the number of cpus. This is normal in a multithreaded environment as the scheduler schedules on the thread level instaed of the process level.