Mailman 3 February 2014 - pypy-dev

Telling the JIT to remove a stack array
by Timothy Baldridge Feb. 24, 2014

Feb. 24, 2014

I have an interpreter inner loop that looks something like this: jitdriver = JitDriver(greens=['ip', 'tos', 'bytecodes', 'consts'], reds=['locals', 'stack']) def interpret(code, args): assert isinstance(code, Code) bytecodes = code.bytecodes consts = code.consts vars = code.vars locals = array_of_size(code.locals) ip = 0 stack = array_of_size(code.stacksize) tos = -1 while True: jitdriver.jit_merge_point(ip=ip, tos=tos, bytecodes=bytecodes, consts=… [View More]

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Easy way to get access to cmpxchg?
by Timothy Baldridge Feb. 24, 2014

Feb. 24, 2014

It'd be nice to be able to do something like this in rpython: compare_and_swap(foo.bar, oldval, newval) Or basically the cmpxchg. How hard would it be to get this in? Timothy -- "One of the main causes of the fall of the Roman Empire was that-lacking zero-they had no way to indicate successful termination of their C programs." (Robert Firth)

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Python C-API on Windows
by Johan Råde Feb. 24, 2014

Feb. 24, 2014

Is it possible to use the Python C-API with PyPy on Windows? Has it ever been tested? I tried to build and import a simple hello world extension module using the C-API with PyPy on Windows. It fails. You can find the code (and its expected and observed behavior) at the end of this post. One reason it fails is that the definition of PyMODINIT_FUNC in modsupport.h is incorrect. On Windows the module initialization function needs a __declspec(dllexport) declaration or it will not be exported … [View More]

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numpy plans in the next 6 months?
by Ian Ozsvald Feb. 22, 2014

Feb. 22, 2014

Hi again. In relation to my other mail, I'm curious about the plans for numpy in the next 6 months. Is there an expectation that better-than-numpy results might be obtained (e.g. using AVX/SSE or being cache friendly)? I'll mention these as they will probably be relevant to some of the audience. Cheers, Ian. -- Ian Ozsvald (A.I. researcher) ian(a)IanOzsvald.com http://IanOzsvald.com http://MorConsulting.com/ http://Annotate.IO http://SocialTiesApp.com/ http://TheScreencastingHandbook.com … [View More]

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Debugging Blocked Block exceptions
by Timothy Baldridge Feb. 22, 2014

Feb. 22, 2014

In an interpreter I'm writing I'm often running into Blocked block exceptions. I've been able to solve several of these errors but the problem is always figuring out what exactly I've done to cause the error. Most of the time it seems to come down to some sort of missing assertions that cause the translator to think that there is no way for an operation to succeed, but I just can't find it. For example, I'm currently getting this error: [translation:ERROR] AnnotatorError: [translation:ERROR] [… [View More]

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GitHub
by Armin Rigo Feb. 18, 2014

Feb. 18, 2014

Hi all, GitHub has a two-years-old mirror of PyPy: https://github.com/pypy/pypy . Nowadays that looks not only useless, but harmful. Would anyone with the proper priviledges disable, hide, or kill it? I can't do it myself apparently (or didn't find the correct button). A bientôt, Armin.

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matplotlib, and numpy
by matti picus Feb. 18, 2014

Feb. 18, 2014

I have had less time to contribute to pypy lately, so here is where the things I took responsibility for stand: numpy - there are many failing tests due to the way numpy random.seed works. Upstream uses a mtrand module, and I simply wrapped the existing python random module. There are subtle differences between the seed in the different modules, we get a different series when setting the seed in our mtrand module. - numpy.linalg.inv does not work (see below) matplotlib - linlag support in … [View More]

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Bytearray broken complexity
by Armin Rigo Feb. 18, 2014

Feb. 18, 2014

Hi all, Yet another mail :-) This is a small note to mention that the str/unicode/bytearray branch that was merged earlier into "default" has some problems of complexity with bytearrays. For example, simply reading "ba[5]" requires a complete copy of the bytearray to be done internally. This means that expected-constant-time operations are not. This mail is thus a reminder that we should do something about it --- we *have* to, before the next release, in my opinion. A bientôt, Armin.

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Conferences for STM paper
by Armin Rigo Feb. 18, 2014

Feb. 18, 2014

Hi Remi, For reference, here are two workshops where an STM paper would probably be a good idea: * Dyla'14 (Workshop on Dynamic Languages and Applications), June 12th, Edinburgh, UK, co-located with PLDI'14. We have already published about PyPy at a couple of previous Dyla workshops. Fwiw, Carl Friedrich Bolz is a co-organizer of this one. Deadline is March 15th, either for a complete article, or for the title of a 10-minutes lightning talk. See http://www.lifl.fr/dyla14/ * WTM 2014 (… [View More]

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PyPy Intermediate C Files
by Kirk Liberty Feb. 18, 2014

Feb. 18, 2014

Hello all, I'm looking to do some experiments with different C compilers and flags for PyPy, but I don't want to have to go through the entire translation process only to change a flag. Are the C files that are written as one of the last steps of translation written in q way that they can be rebuilt many times? Thanks, Kirk

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