How to measure script performance in CPU cycles?

Question

JavaScript

I want to measure the performance of a certain piece of code. Now time measurements are used, using performance.now(). But time is not the most accurate indicator due to a bunch of background processes and various factors. I heard that in v8 you can somehow measure the number of processor cycles before and after the execution of my code. But somehow I can't find how to do it.

Answer 1

It is not the number of cycles that matters, but the number of instructions that are executed in one cycle.

Answer 2

In fact, the number of cycles will give you little useful information. Profiling and benchmarks will
be noticeably more useful

Answer 3

Use v8's built-in profiler https://v8.dev/docs/profile
It shows CPU clocks.