How CPU performance is measured ?

Hello comp.lang.asm.x86 hackers,

I want to know how CPU performance is measured on preemptive
multitasking OSs like Windows, Linux etc.

And how, an IA32 instruction like "jmp ." (jump on self) can take 100%
CPU resources. Since, in a pre-emptive multitasking system (round-robin
scheduling), each process is alloted equal time, and it is upto the
process what it execute in the time alloted (whether SSE instructions,
or MOV instruction or jump on self instructions). So, how this kind of
instruction forces CPU usage to go 100% (I've seen it in Task Manager
in Windows) ?

Thanx in advance,
Ashish Shukla alias Wah Java !!

Wah Java !!

.

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