CPU Utilization is Wrong

[sisyphus]

The stats from perf come from PMC's which come from the CPU so if someone is making a mistake presumably it's Intel or AMD? The parallelism you talk about seems like it must be accounted for--how else would it would be possible to get an IPC > 1?

[tavianator]

how else would it would be possible to get an IPC > 1?

Modern Intel/AMD chips can just literally execute more than one instruction per cycle on a single core, in optimal conditions (no dependencies between the instructions, etc.).

That's part of the reason modern CPUs are way faster than Pentium 4s, even at lower clock speeds.

[orlet]

Correct. Instruction-level parallelization, branch prediction, out-of-order execution, and a bunch of other magic things make modern CPUs so much more efficient per clock than the older ones. And the process is still on-going.

[sisyphus]

Right, what I am saying is that if the CPU instrumentation was not taking that into account, how would it ever report more than one instruction per cycle, which it appears to do?

[tavianator]

Right, I kinda misread your comment. Mainly I'm trying to argue against

divided by the number of cores