Armin Rigo <[email protected]> added the comment: Just wait a bit longer. This is an extreme case of long arithmetic, where CPython has (I believe) a special implementation for "x * x" where x is a large object of type "long", which we are missing. It's in other words completely unrelated to multiprocessing. If I tweak the example until it looks more like a real load (see test2.py), the numbers are in favour of PyPy again.
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