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PyPy sprint in Düsseldorf, 6 Nov - 13 Nov

The next PyPy sprint will be held in the Computer Science department of Heinrich-Heine Universität Düsseldorf from the 6th to the 13th of November 2009. This is a fully public sprint, everyone is welcome to join us.

Topics and goals

At the sprint we intend to work on the JIT generator in PyPy and on applying it to PyPy Python interpreter.

The precise work that will be done is not fixed, as we don't know in which state the JIT will be in November. However, possible areas of work might include:

  • tweaking the interpreter/objspace to be more JIT-friendly, e.g. instance implementation code, call code
  • if there is interest starting non x86-32 JIT backends
  • trying out existing software to find features where the optimizations of the JIT could be improved
  • improving our benchmarking infrastructure

We will give special priority to topics that "non-core" people find interesting (as long as they are somehow JIT-related).

For an introduction of how our JIT-generation process works, please refer to our blog:

There is also a more dense academic paper about the subject:


The sprint will take place in a seminar room of the computer science department. It is in the building 25.12 of the university campus. For travel instructions see


If you'd like to come, please subscribe to the pypy-sprint mailing list and drop a note about your interests and post any questions. More organisational information will be send to that list. We'll keep a list of people which we'll update (which you can do so yourself if you have codespeak commit rights).


Unknown wrote on 2009-09-25 08:53:

Following the svn mailing list, there appears to have been a number of quite large refactorings of the JIT recently. Is there a good description of what they are going to achieve, and what the performance gains are? A blog post with an update would be really cool