threads to a single core. See the following discussions:
* http://smoothspan.wordpress.com/2007/09/14/guido-is-right-to-leave-the-gil-in-python-not-for-multicore-but-for-utility-computing/
- * http://docs.python.org/faq/library#id18
+ * http://docs.python.org/faq/library#can-t-we-get-rid-of-the-global-interpreter-lock
* http://www.artima.com/weblogs/viewpost.jsp?thread=214235
* http://www.snaplogic.com/blog/?p=94
* http://stackoverflow.com/questions/31340/