Updates on PyPy 1.5, tour of CPython and RPython main loop

1. PyPy 1.5
jss 2011-05-05

2. Alternative Implementations
• CPython
• Psyco
• Unladen Swallow
• PyPy

3. psyco
• import psyco
• Just in Time (JIT) Compilation
• JIT Specialization
• 32bit only
• maintenance only - latest version 1.6 is 3 years old

4. Unladen Swallow
• started as Google Project, but ppl. pulled mid 2010
• JIT: LLVM back-end for CPython
• Plus lots of little tweaks - got pushed upstream from 2.6.1 onwards
• PEP 3146 (accepted): merge into CPython
• Targeting 3.3, but stale for 10 months - no interest on python-dev

5. PyPy
• Python in Python
• JIT
• RPython (details later in the interactive session)

6. PyPy 1.5
• Improved C Module Support
• JIT for 86 and 86_64!
• CPython 2.6 and 2.7 compatible
• Gaining momentum: Compatibility list online, Numpy in development

7. __future__
PyPy 1.6
CPython 2.6 CPython 2.7
CPython 3.3

8. Code Tour
• python dis module
• CPython Main Loop
• BINARY_ADD
• Manual tracing