PyPy -- How can it possible beat CPython?
- by Vulcan Eager
From the Google Open Source Blog:
  PyPy is a reimplementation of Python
  in Python, using advanced techniques
  to try to attain better performance
  than CPython. Many years of hard work
  have finally paid off. Our speed
  results often beat CPython, ranging
  from being slightly slower, to
  speedups of up to 2x on real
  application code, to speedups of up to
  10x on small benchmarks.
How is this possible? Which Python implementation was used to implement PyPy? CPython? And what are the chances of a PyPyPy or PyPyPyPy beating their score?
(On a related note... why would anyone try something like this?)