May 2013 - Boost - lists.boost.org

[testing] run.py and cross compilation
by Niall Douglas 02 May '13

02 May '13

> Is there some possibility to compile sources on one platform (x86) and > then run compiled tests on other platform (ARM/Android) using run.py > script? > > This is required, because Android SDK exists only for x86 so there is > no way to compile tests on ARM Android device. I believe we have a related or similar problem with unit testing Boost on BB10. Niall --- Opinions expressed here are my own and do not necessarily represent those of BlackBerry Inc.

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[gsoc2013] Proposal for Boost.Math Bernoulli numbers and special functions project
by Artemy Margaritov 02 May '13

02 May '13

Hi folks! I want to provide my proposal for Boost.Math Bernoulli numbers and special functions poject to the Boost community. Please, lets discuss it! I will be grateful for your advices. -- Best regards, Artemy Margaritov

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Re: [boost] [gsoc-13][proposal] Boost.uBLAS
by Aditya Avinash 02 May '13

02 May '13

On Thu, May 2, 2013 at 1:24 AM, Aditya Avinash <adityaavinash143(a)gmail.com>wrote: > I have updated the proposal. Here it is. > > > On Thu, May 2, 2013 at 1:21 AM, Aditya Avinash <adityaavinash143(a)gmail.com > > wrote: > >> Hi, this is my GSOC 13 proposal on Boost uBLAS. >> >> >> On Wed, May 1, 2013 at 3:15 PM, David Bellot <david.bellot(a)gmail.com>wrote: >> >>> Great. I'm looking forward to it. >>> >>> Best, >>> David >>> >>> >>> On Tue, Apr 30, 2013 at 11:06 PM, Aditya Avinash < >>> adityaavinash143(a)gmail.com >>> > wrote: >>> >>> > I'll upload in 16 hrs. >>> > >>> > On Wed, May 1, 2013 at 2:55 AM, David Bellot <david.bellot(a)gmail.com> >>> > wrote: >>> > >>> > > Hi Aditya, >>> > > >>> > > yes, please send me a written proposal, so that I can help you on >>> that. >>> > > It's definitively something we want to do for ublas. >>> > > >>> > > Best, >>> > > David >>> > > >>> > > >>> > > On Mon, Apr 29, 2013 at 6:56 PM, Aditya Avinash >>> > > <adityaavinash143(a)gmail.com>wrote: >>> > > >>> > > > Hi, I have a proposal for boost in gsoc-13 under boost.ublas >>> > > > >>> > > > *Proposal: SIMD abstraction for uBlas.* >>> > > > >>> > > > >>> > > > - I want to develop SIMD abstraction for uBlas. >>> > > > >>> > > > >>> > > > Goal 1: Develop the Intel SSE & AVX backend for SIMD abstraction in >>> > > uBLAS. >>> > > > >>> > > > Goal 2: Develop AMD SSE backend for SIMD abstraction in uBLAS. >>> > > > >>> > > > Goal 3: Develop frontend for SIMD abstraction in C++. >>> > > > >>> > > > Goal 4: Joining of frontend and backend, so the the code is >>> flexible to >>> > > > implement on both AMD and INTEL. >>> > > > >>> > > > Goal 5: Develop the ARM-NEON backend for SIMD abstraction in >>> uBLAS. >>> > (if >>> > > > time permits). >>> > > > >>> > > > -- >>> > > > ---------------- >>> > > > Atluri Aditya Avinash, >>> > > > India. >>> > > > >>> > > > _______________________________________________ >>> > > > Unsubscribe & other changes: >>> > > > http://lists.boost.org/mailman/listinfo.cgi/boost >>> > > > >>> > > >>> > > _______________________________________________ >>> > > Unsubscribe & other changes: >>> > > http://lists.boost.org/mailman/listinfo.cgi/boost >>> > > >>> > >>> > >>> > >>> > -- >>> > ---------------- >>> > Atluri Aditya Avinash, >>> > India. >>> > >>> > _______________________________________________ >>> > Unsubscribe & other changes: >>> > http://lists.boost.org/mailman/listinfo.cgi/boost >>> > >>> >>> _______________________________________________ >>> Unsubscribe & other changes: >>> http://lists.boost.org/mailman/listinfo.cgi/boost >>> >> >> >> >> -- >> ---------------- >> Atluri Aditya Avinash, >> India. >> > > > > -- > ---------------- > Atluri Aditya Avinash, > India. > -- ---------------- Atluri Aditya Avinash, India.

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[gsoc 2013] draft proposal for chrono::date
by Anurag Kalia 02 May '13

02 May '13

I have prepared a draft proposal for Boost.chrono/date implementation. Could you kindly go through it and tell me of any errors and suggestions? Regards, Anurag Kalia.

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Proposal for Bernoulli numbers
by Gaurav Deshmukh 02 May '13

02 May '13

Mentors for Boost.Math, please review my proposal at the melange site. http://www.google-melange.com/gsoc/proposal/review/google/gsoc2013/gaurav42… Shall I include details about the templates of functions I will have to implement? Or are there any corrections or details needed? Thanking you, Gaurav Deshmukh

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[GSOC] Are we going to participate?
by Antony Polukhin 02 May '13

02 May '13

Hi all, Today starts Google Summer of Code. Is Boost community will become one of the mentoring organizations? What project ideas are we proposing? (As for me, I'd love to see unique_ptr+unique_array implemented using Boost.Move; C++11 features support for MPL, Fusion, Graph, Bind, Optional; BTree library; library for getting system info) -- Best regards, Antony Polukhin

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[Log] Plans to use std::thread?
by Rich E 02 May '13

02 May '13

Hi all, As I've been testing out the newly added Boost.Log library, I noticed it is relying on Boost.Thread even when the C++11 <thread> library is present. Are there any plans to allow the native <thread> library to be used when it is available? I think this can be done with Boost.Config's BOOST_NO_CXX11_HDR_THREAD macro. Thanks, Rich

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Re: [boost] GSoC Boost.Multiprecision project
by Jyotesh Choudhari 01 May '13

01 May '13

Hello, > Hi Jyotesh. >>>> Looking at the project description, I think >>>> I have understood what needs to be implemented >>>> in this project. > Yes, you seem to have a good grasp of the issues. > Good work. >>>> I have also gone through the current >>>> code cpp_bin_float.hpp and I have understood some >>>> part of it. I want to know how >>>> detailed should my proposal be? What details >>>> should I include in my proposal? >>>> What should be the deliverables for the project? > Go ahead and add some details from cpp_bin_float > if you like. You can mention that this is a potential > solution method. Thank you for your valuable feedback. I have written project proposal for the first time in my life. So, I did not know what details to include. I have made some changes to my proposal as per your suggestions. > Other than that, I believe you have found > the right level of detail, with a few more suggestions > from my side below. >> I have attached my proposal with this mail. >> Please have a look at it and let me know your feedback. >> Thanks and regards, > I suggest you move the FFT algorithms to an optional > part, add a bit more time for the elementary transcendental > functions, and add some time for testing the various > milestones in the project. > After that, you should start submitting your proposal. > As far as I know, you can modify your proposal up > to May 03. I have written FFT algorithm as an optional algorithm now and made some changes to schedule. Please let me know if it is fine now. > Keep up the good work. > Sincerely, Chris I was studying the code for cpp_bin_float and I have some doubts in my mind. 1. What are eval_ops_signed_type, eval_ops_unsigned_type and eval_ops_float_type? 2. What is the use of following lines? typedef mpl::list<eval_ops_signed_type> signed_types; typedef mpl::list<eval_ops_unsigned_type> unsigned_types; typedef mpl::list<eval_ops_float_type> float_types; These are not used in the class elsewhere. Similar lines are present in cpp_dec_float.hpp also and not used elsewhere in the class. 3. In the function from_float_type, I think the variable number_of_digits should be initialized to zero before using it in while loop. Lastly, I have seen on mailing list, that some of the students are submitting code samples. As I am busy with my end-semester exams and R&D project, I am not able to send any sample code. As soon as I get free, I will send it. Thanks and regards, Jyotesh Choudhari

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[gsoc-13][proposal] Boost.uBLAS
by Aditya Avinash 01 May '13

01 May '13

Hi, I have a proposal for boost in gsoc-13 under boost.ublas *Proposal: SIMD abstraction for uBlas.* - I want to develop SIMD abstraction for uBlas. Goal 1: Develop the Intel SSE & AVX backend for SIMD abstraction in uBLAS. Goal 2: Develop AMD SSE backend for SIMD abstraction in uBLAS. Goal 3: Develop frontend for SIMD abstraction in C++. Goal 4: Joining of frontend and backend, so the the code is flexible to implement on both AMD and INTEL. Goal 5: Develop the ARM-NEON backend for SIMD abstraction in uBLAS. (if time permits). -- ---------------- Atluri Aditya Avinash, India.

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Re: [boost] [gsoc-2013] Boost.Thread/ThreadPool project
by Niall Douglas 01 May '13

01 May '13

> Le 29/04/13 21:35, Niall Douglas a ?crit : > > No major changes to the C++11 futures API is needed. Rather that a > > different, but compatible, optimized implementation of future<> gets > > returned when used from a central asynchronous dispatcher. So the C++ > > standard remains in force, only the underlying implementation is more > > optimal. > > Could you explain me what a central asynchronous dispatcher is? An asynchronous procedure call implementation. Here's Microsoft's: http://msdn.microsoft.com/en-us/library/windows/desktop/ms681951(v=vs.85).as px. Here's QNX's: http://www.qnx.com/developers/articles/article_870_1.html. Boost.ASIO is the same thing for Boost and C++ but implemented by application code. It is *not* like asynchronous POSIX signals which are a nearly useless subset of APCs. > If not, please could you elaborate what kind of optimizations can be > obtained? If you have transactional memory in particular, you gain multi-CAS and the ability to (un)lock large ranges of CAS locks atomically, and a central dispatcher design can create batch lists of threading primitive operations and execute the batch at once as a transaction. Without TM, you really need the kernel to provide a batch syscall for threading primitives to see large performance gains. > > Futures come in because you'd naturally use std::packaged_task<> with > > Boost.ASIO. It returns a future. > Could you point me to the Networking paper proposal that has > packaged_task<> on its user interface. I would expect this to be an > implementation detail. You misunderstand me. *If* you want Boost.ASIO to dispatch unknown std::function<>, *then* std::packaged_task<> is the most obvious route forwards. And the correct way to pass a value from one execution context to another is std::future<>. This includes the single threaded case e.g. when going through a C++ -> C -> C++ transition as a stack unwinds. > > For reference, the AFSIO/AFIO project is *not* a threadpool. It's a batch > > asynchronous execution engine based on Boost.ASIO that lets you chain, in > > vast numbers, huge arrays of std::function<> whose returns are fetched using > > std::future<> to be executed asynchronously according to specified > > dependencies e.g. if A and B and C, then D, then E-G. That sort of thing. > So the thread pool you need is an internal one that is adapted to you > particular needs, isn't it? I think you don't understand what Boost.ASIO is or how it works. Boost.ASIO's core is boost::asio::io_service. That is its dispatcher implementation which each dispatch execution context being executed via boost::asio::io_service::run() which is effectively an event loop. Third parties then enqueue items to be dispatched using boost::asio::io_service::post(). You don't have to run Boost.ASIO using multiple threads: it can be single threaded. So is my thread pool an internal one adapted to my particular needs? In the sense I need not use threads at all, yes. In the sense that boost::asio::io_service's use scenario is inviolate, no. Boost.ASIO has its API, and you have to use it. And Boost.ASIO's API will be similar to the TR2 networking API. There is nothing stopping a person merging a Boost.ASIO managed thread pool with a traditional thread pool. I would struggle to see the use case though - this would an excellent thought project actually which would benefit any Boost.ThreadPool. > > One thing presently implemented on that engine is asynchronous file i/o, but > > in the next month or two you'll hopefully see batch parallel SHA256 using > > 4-SHA256 SSE2 and NEON implementations also added to the asynchronous > > engine. The idea is that the engine is fairly generic for anywhere where you > > do need to chain lots of coroutine type items together (not that it supports > > Boost.Coroutine yet). v1 isn't particularly generic nor optimal, but I'm > > hoping with feedback from Boost that v2 in a few years' time would be much > > improved. > > > As Oliver noted you could take a look at Boost.Fiber and Boost.Task. Right now anything Boost.Context based can't have multiple contexts simultaneously entering the kernel apart from on QNX and possibly Hurd. Therefore, for the time being, full fat threads are the only thing being considered. If kernel support ever includes coroutines or fibres, that will be eagerly added (I like coroutines, I use them a lot on Python). Note that on async i/o capable platforms multiple threads are solely used for non-async APIs like batch directory creation and batch chmod. Normal i/o gets multiplexed using completion handlers. Currently on Windows for example, threads are barely used at all. Niall --- Opinions expressed here are my own and do not necessarily represent those of BlackBerry Inc.

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