Mailman 3 August 2012 - cython-devel

Cython 0.17 beta 2 released
by Stefan Behnel Aug. 8, 2012

Aug. 8, 2012

Hello everyone, on behalf of the Cython project team, I'm proud to announce the release of our second beta of Cython 0.17. This is another major step forward in the development of the language that will make life easier for a lot of users, rounds up some rough edges of the compiler and adds (preliminary) support for CPython 3.3 and PyPy. Please give this beta release as much testing as you can, so that we can quickly advance towards the final release. Download: http://cython.org/release/Cython-0.17b2.tar.gz Release notes: http://wiki.cython.org/ReleaseNotes-0.17 Documentation: http://docs.cython.org/ Major features of this release include: * vastly improved integration with the C++ STL containers http://docs.cython.org/src/userguide/wrapping_CPlusPlus.html#standard-libra… http://docs.cython.org/src/tutorial/strings.html#c-strings * "yield from" delegation between generators (PEP 380) http://www.python.org/dev/peps/pep-0380/ * alpha quality support for PyPy (via cpyext) http://docs.cython.org/src/tutorial/pypy.html Several other features and improvements are listed in the release notes: http://wiki.cython.org/ReleaseNotes-0.17 Have fun, Stefan

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Bad interaction between cimported types and module cleanup
by Lisandro Dalcin Aug. 4, 2012

Aug. 4, 2012

Basically, the module cleanup function nullifies the type ptr of cimported parent types, but tp_dealloc slots of children types access these null pointers, then you get a segfault. Looking at Py_Finalize() , atexit functions are run BEFORE a gargabe collection step and the destroy of all modules. @Stefan, I remember you also had issues with module cleanup and object deallocation. Did you find a solution? Could you give a quick look at the following patch? Do you think the extra pointer deref for getting Py_TYPE(o)->tp_base->tp_dealloc would be a performance regression? BTW, The "if 0" branch is the original code, the else branch is my proposed fix. diff --git a/Cython/Compiler/ModuleNode.py b/Cython/Compiler/ModuleNode.py index 2472de3..8758967 100644 --- a/Cython/Compiler/ModuleNode.py +++ b/Cython/Compiler/ModuleNode.py @@ -1111,7 +1111,12 @@ class ModuleNode(Nodes.Node, Nodes.BlockNode): if base_type: tp_dealloc = TypeSlots.get_base_slot_function(scope, tp_slot) if tp_dealloc is None: - tp_dealloc = "%s->tp_dealloc" % base_type.typeptr_cname + if 0: + # XXX bad interaction between + # cimported types and module cleanup + tp_dealloc = "%s->tp_dealloc" % base_type.typeptr_cname + else: + tp_dealloc = "Py_TYPE(o)->tp_base->tp_dealloc" code.putln( "%s(o);" % tp_dealloc) else: -- Lisandro Dalcin --------------- CIMEC (INTEC/CONICET-UNL) Predio CONICET-Santa Fe Colectora RN 168 Km 472, Paraje El Pozo 3000 Santa Fe, Argentina Tel: +54-342-4511594 (ext 1011) Tel/Fax: +54-342-4511169

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help getting NumPy into a 32-bit Jenkins build environment
by Stefan Behnel Aug. 3, 2012

Aug. 3, 2012

Hi, I've been trying to set up a 32bit build environment on Jenkins. Most of it works nicely by just switching to "gcc -m32", but NumPy fails to build with that setup due to the lack of dependencies. It actually finds them when looking for their header files in the wrong (64bit) places, and then fails to build when it can't find the expected 32bit libraries. Is there a way to tell NumPy that I really don't care about BLAS, LAPACK and all of its friends and just want bare arrays? Or is there an easy way to install 32 bit versions of those dependencies on sage.math? I'd be fine with having them built and installed into a local directory (namely, in standard directory layout under /home/scoder/jenkins/Tools/libs32/). Given that all current 32bit problems are in NumPy related tests, it wouldn't be all that helpful to exclude NumPy from the test runs... Stefan

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Re: [Cython] [cython-users] Re: Cython 0.17 beta 1 released
by mark florisson Aug. 3, 2012

Aug. 3, 2012

On 27 July 2012 23:30, Bradley Froehle <brad.froehle(a)gmail.com> wrote: > Thanks to the work of Yaroslav Halchenko, there is an experimental Debian > package for Cython 0.17.beta1 -- http://packages.qa.debian.org/c/cython.html > > However, the builds are showing a lot of test failures on non-amd64 sytems. > See https://buildd.debian.org/status/package.php?p=cython&suite=experimental > Many of the errors seem related to assumptions made about the sizes of > various integers (int vs. long vs long long). Ideally we'll be able to > clean up these failures before the final release. > > -Brad Thanks, I think it's mostly the tests that are wrong. I'll try to get it fixed on linux 32 bit.

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Fwd: [ANN] SIAM Conference on Computational Science & Engineering Submission Deadlines Approaching!
by Fernando Perez Aug. 2, 2012

Aug. 2, 2012

Dear Colleagues, the SIAM CSE13 conference will be held next year in Boston, and this is a conference that is well suited for much of the type of work that goes on in the open source scientific Python development community (and Julia). The conference is co-chaired by Hans-Petter Langtangen, well known around these parts for his several books on scientific computing with Python and for having led a campus-wide adoption of Python as the core computational foundation across the University of Oslo. I am also on the program committee, as well as Randy LeVeque and other Python-friendly folks. An excellent way to participate is to organize a one- or two-part minisymposium on a specific topic with a group of related speakers (instructions at http://www.siam.org/meetings/cse13/submissions.php). Please note that the MS deadline is fast approaching: August 13, 2012. If you have any further questions, don't hesitate to contact me or one of the other organizers if you feel they can address your concerns more directly: "Fernando Perez" <Fernando.Perez(a)berkeley.edu> "Randy LeVeque" <rjl(a)amath.washington.edu> (Reproducible research track) "Hans Petter Langtangen" <hpl(a)simula.no> (Conference co-chair) "Karen Willcox" <kwillcox(a)mit.edu> (conference chair) ---------- Forwarded message ---------- From: Karen Willcox <kwillcox(a)mit.edu> Date: Tue, Jul 24, 2012 at 6:08 AM Subject: [SIAM-CSE] SIAM Conference on Computational Science & Engineering Submission Deadlines Approaching! To: SIAM-CSE(a)siam.org *SIAM Conference on Computational Science & Engineering (CSE13)* February 25-March 1, 2013 The Westin Boston Waterfront, Boston, Massachusetts, USA**** ** ** SUBMISSION DEADLINES ARE APPROACHING!**** August 13, 2012: Minisymposium proposals September 10, 2012: Abstracts for contributed and minisymposium speakers**** Visit http://www.siam.org/meetings/cse13/submissions.php to submit.**** ** ** Twitter hashtag: #SIAMcse13**** ** ** For more information about the conference, visit * http://www.siam.org/meetings/cse13/* or contact SIAM Conference Department at meetings(a)siam.org.**** -- Karen Willcox Professor and Associate Department Head Department of Aeronautics and Astronautics, MIT http://acdl.mit.edu/willcox.html _______________________________________________ SIAM-CSE mailing list To post messages to the list please send them to: SIAM-CSE(a)siam.org http://lists.siam.org/mailman/listinfo/siam-cse

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