eat cpu

hey, guys, please forgive my poor english at first. I am a noob programmer, so I usually write some dead loop code by accident, and then the cpu will run at maximum utilization, so that I can't control my desktop, including switch to tty, what can I do is to reboot it forcely. and I found that...

Nowadays, I am facing with very annoying situation; somethings hangs up/freeze/locks my pc since it eats my cpu, even I had 5 times small(5-10 seconds periods) freezes while writing this message. I can see it from the CPU monitor but I could not find who is it exaclty? Any help is appreciated ...