Diagnosing runaway CPU in a .Net production application

Question

Does anyone know of a tool that can help me figure out why we are seeing runaway CPU in a managed app?

What I am not looking for:

Answer 1

I think you should look at memory and disk usage as well. If a machine runs out of memory and needs to start using virtual memory (on the disk drive), you'll see a spike in CPU and disk activity. In such conditions what looks like a CPU bottleneck is actually a memory bottleneck.