PyPy is a fast alternative Python implementation. Software
Transactional Memory is a current academic research topic. Put the two
-together --brew for a couple of years-- and we
obtain a version of PyPy
+together --brew for a couple of years-- and we a version of PyPy
that runs on multiple cores, without the infamous Global Interpreter
Lock (GIL). It has been released in 2013 in beta, including
integration with the Just-in-Time compiler.