Mailman 3 March 2006 - pypy-dev

Tokyo sprint 23/4 - 29/4 announcement
by Anders Chrigström March 27, 2006

March 27, 2006

Tokyo PyPy Sprint: 23rd - 29th April 2006 ============================================================ The next PyPy sprint is scheduled to take place 23rd- 29th April 2006 (Sunday-Saturday) in Akihabara, Tokyo, Japan. We will together with FSIJ (Free Software Initiative of Japan) aim to promote Python and PyPy. We therefor invite Japanese hackers knowledgeable in Python to join our sprint! We'll give newcomer-friendly introductions. To learn more about the new Python-in-Python … [View More]implementation look here: http://codespeak.net/pypy For this sprint we are particularly interested in meeting and coding on PyPy together with interested Japanese Python hackers. Please register your interest at pypy-sprint(a)codespeak.net as soon as possible and we will help with any questions regarding getting started, pointing to relevant documentation etc. The PyPy team is curious and interested in the experience of hacking code for embedded devices and would love to discuss and get feedback on optimisation efforts and the current state of PyPy. Goals and topics of the sprint ------------------------------ Possible suggestions for topics are: - Work on gensqueak (our Squeak backend) or possibly other backends. - Implementing Python 2.5 features in PyPy. - Progress further on an 'rctypes' module aiming at letting us use a ctypes implementation of an extension module from the compiled pypy-c. - Writing ctypes implementations of modules to be used by the above tool. - Experimenting and improving performance of our garbage collectors. - Experiment with PyPy flexibility or other aspects of the implementation. - Possibly experiment with writing modules translatable for use both in PyPy and CPython. - Whatever participants want to do with PyPy or particular areas of PyPy (please send suggestions to the mailing list before to allow us to plan and give feedback) Location & Accomodation ------------------------ The sprint will be held at National Institute of AIST (National Institute of Advanced Industrial Science and Technology, http://www.aist.go.jp/index_en.html), Akihahabara (the technical gadget district in Tokyo). Yutaka Niibe is our contact person there, helping with arranging facilities. Niibe is the chairman of FSIJ and they have invited us to sprint in Tokyo and we are very grateful for the help and interest we have recieved so far. The facilities we are sprinting in are located here: http://www.gtrc.aist.go.jp/en/access/index.html#Akihabara The actual address is: Akihabara Dai Bldg , 1-18-13 Sotokanda, Chiyoda-ku, Tokyo 101-0021 Japan Phone: +81-3-5298-4729 Hotel areas - we are recommended to book hotels in Ueno and Asakusa (old town), from those areas there are only two metro stops to Akihabara. Please note that hotelrooms in Tokyo are often very small. http://www.wh-rsv.com/english/akihabara/index.html (nearest hotel to sprint location) http://www.greenhotel.co.jp/ochanomizu_e.html http://www.ohgai.co.jp/index-e.html (Ueno) http://www.toyoko-inn.com/e_hotel/00012/index.html (Asakusa) http://www.hotelnewkanda.com/ (second nearest, but no english page) Here is a url for booking hotels with not too unreasonable rates (see map): http://japan-hotelguide.com/hotels/Japan/Tokyo/index.htm For more general tourist information about travelling to Japan and Tokyo - please see: http://www.jnto.go.jp/eng/ http://www.japantravelinfo.com/ (really useful information regarding airfares, hotels, currency, phones etc etc) Comments on the weather: In end April it is ca 20 degrees Celsius. Exact times ----------- The public PyPy sprint is held Sunday 23rd - Saturday 29th April 2006. Hours will be from 10:00 until people have had enough. It's a good idea to arrive a day before the sprint starts and leave a day later. Sometimes people cannot stay for the whole sprint - you are welcome even if you can only stay for a day or a few days. Sunday: Starting at 10:00. This day is focused on getting to know PyPy enought to start to participate. We will hold a PyPy tutorial and an architectural overview. Planning meeting for the work to be done during the week and grouping of developers (pairs or groups mixing new participants with core developers). Dinner in the evening (Yutaka will arrange a place for us to go to). Monday-Tuesday: Starting at 10:00 with status meetings. Possible regrouping depending on the interest and progress of the various teams. Wednesday: Breakday (coding is allowed although we recommend taking a break). Thursday-Saturday: Starting at 10:00 with status meetings. Possible regrouping depending on the interest and progress of the various teams. Ending on Saturday with a Closure session - summing of the work and planning work to be done until the next sprint. Network, Food, currency ------------------------ We will have access to WiFi at AIST - please make sure you have wlan capabilities. Electricity outlets: 100V (adapters needed for european standard). Currency is Japanese yen. There are Citibank cash machines that accepts cash withdrawals from the major cards such as VISA and Mastercard. But it is a good idea to bring cash. Also note that cell phones (european) are not very compatible with the Japanese network. There are possibilities for 3G phones to hire a phone and put your simcard in there. At the airport (both Kansai and Narita) there are information and places were this can be arranged (to a cost of course). Food: well - japanese food is great (wether it is sushi, sashimi, tempura, sukiyaki, teriyaki.... Eating out is not that much differently prized than any large european town. There are of course restaurants serving other food than japanese (chinese, korean, McDonalds ;-). Please also note that vegetables and fruit is quite expensive in Japan. For more information - see tourist url:s above. Registration etc.pp. -------------------- Please subscribe to the `PyPy sprint mailing list`_, introduce yourself and post a note that you want to come. Feel free to ask any questions there! There also is a separate `Tokyo people`_ page tracking who is already thought to come. If you have commit rights on codespeak then you can modify yourself a checkout of http://codespeak.net/svn/pypy/extradoc/sprintinfo/tokyo/people.txt .. _`PyPy sprint mailing list`: http://codespeak.net/mailman/listinfo/pypy-sprint .. _`Tokyo people`: http://codespeak.net/pypy/extradoc/sprintinfo/tokyo/people.html [View Less]

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Obtaining the Control Flow Graph
by Brian C. Lum March 27, 2006

March 27, 2006

Dear PyPy Developers: I have been looking for a good way to convert python code into a control flow graph. I know of Python functions that will convert an expression into an abstract syntax tree (i.e. ast = parser.expr('(x+5)*5') then t = ast.totuple() then t), but I am not sure how to obtain a CFG. I've gone through the documentation and found http://codespeak.net/pypy/dist/pypy/doc/objspace.html#the-flow-model Is this the best way to obtain the control flow graph? With thanks, Brian

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Looking for a thesis, reloaded
by Antonio Cuni March 27, 2006

March 27, 2006

Hi, I've spent the last few days reading all documentation I've found and playing with PyPy's sources, so now I am a little bit comfortable with PyPy's concepts. Tomorrow I will talk with my professor about the thesis, and we'll have to decide what to do; in these days I've had an idea, in addition to those proposed in this list: I could write a .NET CLR backend; what do you think about? It could be a useful thing for the project? ciao Anto

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Re: Hey friends, I'm SOOOO HAPPPYYY
by Mark Mc Mahon March 27, 2006

March 27, 2006

Hi, I read your announcement with some excitement. Though I have another pyrex related query. One thing that Pyrex can do that I find quite useful is to be able to create C functions that can be called from any code. Using this it is possible to create DLL's for applications that have a plugin interface (that accept a C DLL with certain functions) - but knows nothing of python. Is this something that could be easily supported by raymond? (interesting name for a project :-) ) Thanks Mark

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Re: Hey friends, I'm SOOOO HAPPPYYY
by Guido van Rossum March 27, 2006

March 27, 2006

On 3/25/06, Christian Tismer <tismer(a)stackless.com> wrote: > What is it good for? > -------------------- > > You can write algorithms in an almost Pythonic language > instead of using C. Your code will be translated into > a C Python extension module of very high efficiency. I don't think I've ever written a C extension for performance reasons. (I've tweaked built-in objects instead. :-) I've written many extensions to interface with existing C code though, like UI … [View More]

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Hey friends, I'm SOOOO HAPPPYYY
by Christian Tismer March 26, 2006

March 26, 2006

[re-sent because the original had too many receivers =] Dear friends, this is just a greeting and short notice to a few of my friends. I am just so happy and relaxed and resolved, so I have to tell you. Summary: -------- PyPy is now able to compile efficient extension modules! Details: -------- I'm going to write a larger article about this. Credentials: ------------ This is a spin-off of the PyPy project. See http://www.codespeak.net/pypy All credentials must go to the group. I only … [View More]found a way to make it accessible and usable in a pre-mature state. I'm just a member of this team, and I (ab)used the results of the project, to create something what every serious Python extension writer will love. What is it good for? -------------------- You can write algorithms in an almost Pythonic language instead of using C. Your code will be translated into a C Python extension module of very high efficiency. Consequences ------------ You will want to stop coding any C extensions by hand at all. Instead, you will produce series of extensions automagically and rank them by their performance, and then choose what fits your needs the best. Availability ------------ The module is not really available right now at all. The proof-of-concept implementation does exist as a test case, see http://codespeak.net:/svn/pypy/dist/pypy/translator/c/test/test_wrapping.py I'm going to do some refinements and optimizations quickly, and there will be a command-line tool that will produce extensions from a simple init script. I want to name this tool "raymond", after my good friend Raymond Hettinger if he doesn't mind. Sponsorship ----------- I'd like to mention that this work was done on behalf of and inspired by EWT LLC, the company I'm currently consulting for. They are interested in using these short-term PyPy spin-offs to produce ultra-fast specialized modules, and they supported my in every possible way. Scope ----- This relatively small addition should be perceived as an interim replacement for the final JIT-accelerated PyPy implementation which we all wish to instantiate at some time. Until that happens, I think we can give the people a very nice tool to improve their productivity. Shortcomings ------------ Right now, there is some level of indirection, since I use PyCObject to implement the wrappers. This will change pretty soon. It is not planned to build chamaeleon objects, which are really both CPython and RPython objects. This would be a slowdown for typical applications. The real solution is to have objects with a single level of indirection. I will post an article about the layout of this during the weekend. Conclusion, again: ------------------ I am so happy! With this result, and with PyPy and its wonderful team. your's sincerely -- chris -- Christian Tismer :^) <mailto:tismer@stackless.com> tismerysoft GmbH : Have a break! Take a ride on Python's Johannes-Niemeyer-Weg 9A : *Starship* http://starship.python.net/ 14109 Berlin : PGP key -> http://wwwkeys.pgp.net/ work +49 30 802 86 56 mobile +49 173 24 18 776 fax +49 30 80 90 57 05 PGP 0x57F3BF04 9064 F4E1 D754 C2FF 1619 305B C09C 5A3B 57F3 BF04 whom do you want to sponsor today? http://www.stackless.com/ [View Less]

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automated test runs
by Armin Rigo March 25, 2006

March 25, 2006

Hi all, I've setup an automated PyPy test runner on snake. It puts the results in http://snake.cs.uni-duesseldorf.de/pypytest/. The latest run's page grows as the tests run, so if the page seems incomplete, reload it to get more. The red F's are clickable. Currently it runs three times a day, for the sprint. I'll probably lower this to once or twice a day. A bientot, Armin

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middleware 2006?
by hpk＠trillke.net March 24, 2006

March 24, 2006

hi all, in 2000 i have been to the "middleware 2000" conference which was quite nice (was there because of the ACE/TAO environment from Douglas Schmidt and some other talks). http://2006.middleware-conference.org/ Deadline is 3rd April and i think we could at least fit in e.g. "Novel development paradigms, APIs, and languages" or maybe some other aspects. I remember the conference is a mix of scientific (some really boring scientific talks, actually :) and of practical … [View More]

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GC problems with PyObject
by Christian Tismer March 24, 2006

March 24, 2006

Hi PyPy-dev! I spent the last two days hunting refcounting problems with pypy generated extension modules. After infinitely long staring at the final flow graphs, I found out that our transition to the gctransform is not as complete as I assumed. Impossible too find by flow graphs, because we are still chiming extra increfs in from the backend, see funcgen.py . I tried to solve this by disabling all the extra increfs, but this doesn't work, yet. Something else must be adjusted. The problem … [View More]

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US-friendly timed pypy-sync # 2
by Michael Hudson March 22, 2006

March 22, 2006

what: weekly pypy-sync meeting where: #pypy-sync on freenode when: 2006-03-22, 5pm Central European Time for 30 minutes who: all active PyPy developers topics: - activity reports - status of tokyo sprint - goals of the 0.9 release - status and work planning for the next few weeks - targetting non-Python conferences This is quite a lot to fit into 30 minutes, so please be at least a little bit prepared, and asking questions here first is postively encouraged. Cheers, mwh -- The snakes … [View More]

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