Mailman 3 November 2017 - pypy-dev

About gurobipy
by Luis José Novoa 31 May '18

31 May '18

Hi All, My name is Luis Novoa. Im working on a large scale optimization problem using python/gurobipy for my implementation. I was wondering if any of you in this list has used gurobipy with pypy, or if it is even possible at this time. Thanks in advance, Luis.

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PhD Positions in programming language runtimes (Python)
by David Bremner 02 May '18

02 May '18

1 Position I: Python on OMR =========================== The candidate will explore the benefits and challenges of using OMR [1] components (e.g. JIT, GC) in Python [2,3] runtimes. This may involve extending OMR in novel ways to better support Python, or vice-versa. If questions like how to balance fast startup time for scripting applications against good performance for compute-intensive workloads sound interesting, this might an opportunity for you. 2 Position II: Python and PGAS ============================== The candidate will implement support for parallel programming with Python, using the PGAS [4] (parallel global address space) model. The PGAS model can significantly simplify the implementation of parallel algorithms on distributed and shared memory computers. Challenges include enabling parallelism while dealing with Python's Global Interpreter Lock (GIL), and implementing distributed garbage collection efficiently. 3 Qualifications ================ Normally applicants to the Computer Science PhD program at UNB require a Master's degree in computer science or a closely related area. This project will require substantial hands-on and experimental work, and being comfortable with Python and C++. Familiarity with Linux and Open Source Software development would be a plus. For position I, exposure to programming language concepts like GC, JIT, and bytecode would be helpful. For position II, experience with parallel programming frameworks and/or languages such as MPI, OpenMP, X10 is an asset. 4 Environment ============= This project is supported by the IBM Centre for Advanced Studies (Atlantic) at the University of New Brunswick [5]. We have a lively group of students, postdocs, and research assistants working on related problems. Students work closely with both UNB researchers and technical experts from IBM, gaining valuable perspective and experience. 5 Support ========= These positions are "fully funded"; the exact funding package is subject to finalization but will be consistent with other fully funded students in Computer Science at UNB. You can find some information about expenses on the UNB web site [6]. 6 Contact ========= Send your resumé and unofficial transcripts by email to Stephen MacKay <smackay3(a)unb.ca> Please specify which position(s) you are interested in. [1]: [http://www.eclipse.org/omr/] [2]: [http://www.python.org] [3]: [http://www.pypy.org] [4]: [http://www.pgas.org/] [5]: [http://www.unb.ca/research/casatlantic/] [6]: [http://www.unb.ca/fredericton/studentservices/international/new_internation…]

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Re: [pypy-dev] a question about translating pypy for raspberry pi
by Antonio Cuni 23 Dec '17

23 Dec '17

Hi Gelin, Please make sure to include pypy-dev in the CC, so that the others can read the answer. I suggest you to try two things: 1. Try to run pypy under strace: this way you can see where it tries to find .so libraries and which one it cannot find (it might be a dependency of libpypy-c itself) 2. Try a nightly build from here: http://buildbot.pypy.org/nightly/trunk/ Il 10 nov 2017 7:51 PM, "Gelin Yan" <dynamicgl(a)gmail.com> ha scritto: > > > On Sat, Nov 11, 2017 at 1:50 AM, Antonio Cuni <anto.cuni(a)gmail.com> wrote: > >> Maybe it's a stupid advice but: are you sure to have copied also >> libpypy-c.so to the raspberry? >> Is it in the same directory as the "pypy" or "pypy-c" executable? >> >> I suggest you to run the script "pypy/tool/release/package.py", which >> builds a tarball containing all the necessary stuff (including the stdlib). >> Then you can simply untar on the raspberry and run it. >> >> You should run it this way: >> python package.py --archive-name=my-pypy-for-rpi >> >> >> >> >> > Hi Antonio > > Yes. I did run the package.py to make a pypy package for ARM. I did > check libpypy-c.so which is placed on the same directory of where pypy is. > > Regards > > gelin yan > >

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Delimited Continuations in PyPy?
by Timothy Baldridge 15 Dec '17

15 Dec '17

I recently came across this paper: https://www.microsoft.com/en-us/research/publication/implementing-algebraic… The gist is that they use setjmp/longjmp to create delimited continuations in compliant C99. It seems like this method is fairly close to what PyPy already does with stacklets. Any reason why this couldn't be ported to PyPy? Of course there'd have to be some sort of stack integration as with stacklets, but it seems that that mostly boils down to making sure the GC has a way to trace the bits of the stack contained in the continuations. I'm considering trying my hand at using their library via rffi, and copying what I need from _stacklet_shadowstack.py. But perhaps there's something I'm missing that makes this a no-go from the start. Thanks, Timothy Baldridge

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Sprint in Leysin: 17-24 March 2018 (very probably)
by Armin Rigo 27 Nov '17

27 Nov '17

Hi all, The next sprint in Leysin is now planned on the week of the 17-24 March 2018. Please let me know if there is a good reason to change it. A bientôt, Armin.

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Re: [pypy-dev] [pypy-commit] pypy default: "eh". On pypy we need to be careful in which order we have pendingblocks.
by Antonio Cuni 20 Nov '17

20 Nov '17

Hi, I suppose that the explanation that you put in the commit message should also go in a comment inside the source code, else when someone sees it it's just obscure. Also, it'd be nice to have some tests about ShuffleDict :) On Thu, Nov 9, 2017 at 2:55 AM, fijal <pypy.commits(a)gmail.com> wrote: > Author: fijal > Branch: > Changeset: r92981:cb9634421fa2 > Date: 2017-11-08 17:54 -0800 > http://bitbucket.org/pypy/pypy/changeset/cb9634421fa2/ > > Log: "eh". On pypy we need to be careful in which order we have > pendingblocks. Otherwise we end up in a setup where we have blocks > a, b and c where a and b are blocked because c needs to add an > attribute, but c is never appended since popitem() would always > return an a or b. I wonder if the same condition can be repeated on > CPython, but I cannot. Unclear how would you write a test for it > since it depends on dictionary order. > > diff --git a/rpython/annotator/annrpython.py b/rpython/annotator/ > annrpython.py > --- a/rpython/annotator/annrpython.py > +++ b/rpython/annotator/annrpython.py > @@ -15,10 +15,34 @@ > typeof, s_ImpossibleValue, SomeInstance, intersection, difference) > from rpython.annotator.bookkeeper import Bookkeeper > from rpython.rtyper.normalizecalls import perform_normalizations > +from collections import deque > > log = AnsiLogger("annrpython") > > > +class ShuffleDict(object): > + def __init__(self): > + self._d = {} > + self.keys = deque() > + > + def __setitem__(self, k, v): > + if k in self._d: > + self._d[k] = v > + else: > + self._d[k] = v > + self.keys.append(k) > + > + def __getitem__(self, k): > + return self._d[k] > + > + def popitem(self): > + key = self.keys.popleft() > + item = self._d.pop(key) > + return (key, item) > + > + def __nonzero__(self): > + return bool(self._d) > + > class RPythonAnnotator(object): > """Block annotator for RPython. > See description in doc/translation.txt.""" > @@ -33,7 +57,7 @@ > translator = TranslationContext() > translator.annotator = self > self.translator = translator > - self.pendingblocks = {} # map {block: graph-containing-it} > + self.pendingblocks = ShuffleDict() # map {block: > graph-containing-it} > self.annotated = {} # set of blocks already seen > self.added_blocks = None # see processblock() below > self.links_followed = {} # set of links that have ever been > followed > _______________________________________________ > pypy-commit mailing list > pypy-commit(a)python.org > https://mail.python.org/mailman/listinfo/pypy-commit >

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Let's fix buildbots
by Maciej Fijalkowski 15 Nov '17

15 Nov '17

Hi everyone I recently looked here: http://buildbot.pypy.org/summary and it looks quite grim. Can we stop for a second and fix most of those so we have some level of greenness around? Cheers, fijal

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bug in socket.py in pypy3-5.8_beta
by zlists＠ns.sympatico.ca 13 Nov '17

13 Nov '17

(I'm sure somewhere there is a proper place to report a bug, but I gave up after hunting for a few minutes.) socket.py has the code import platform kern_version = tuple(map(int, platform.release().partition('-')[0].split('.'))) which is buggy, because the kernel version is not necessarily completely numeric. Check out CONFIG_LOCALVERSION in any kernel config. Thanks. Jim

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a question about translating pypy for raspberry pi
by Gelin Yan 10 Nov '17

10 Nov '17

Hi All I followed the instructions from http://doc.pypy.org/en/release-2.4.x/arm.html and succeeded to build a pypy (it works in qemu environment) when I copied to my raspberry pi 3 (OS: raspbian) and tried to run pypy the program complained: "error while loading shared libraries: libpypy-c.so: cannot open shared object file: No such file or directory" Did I do something wrong here? Regards gelin yan

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RPython proposed deprecation: translator.platform .distutils_platform
by Matti Picus 09 Nov '17

09 Nov '17

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