This is a summary into some investigation into this topic raised by Raymond on python-dev . I’m using Discourse so I can embed some screenshots. Benchmarks on modern machines are hard, as explained by Victor. He has put a lot of work into pyperformance to try to get useful measurements. I used Li…

In my experience, the line-by-line annotation isn’t reliable in “perf”. It may depend on your processor. I have a AMD Ryzen CPU. If you want to check whether the DISPATCH change is responsible for some slowdown, the easiest way is to undo it, i.e. manually hoist the &tstate->interp->ceval.eval_brea…

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