Juin 2021 - Gambit-list - mailman.iro.umontreal.ca

Gambit versus Python+GMP: Timing for Chudnovskys' algorithm for pi
by Bradley Lucier 07 Avr '22

07 Avr '22

Bakul Shah wrote a particularly elegant Scheme program for Chudnovskys' algorithm for pi based on the Common Lisp program here: https://bitbucket.org/tarballs_are_good/numericl/src/5fe8fe7089f48ab1c8a388… Nick Craig-Wood wrote a Python program using the GMP multiprecision library that appears to use exactly the same algorithm here: http://www.craig-wood.com/nick/articles/pi-chudnovsky/ I modified both programs a bit and include them here. They time the calculation of $10^n$ digits of pi for $n=1,2,3,4,5,6,7$. The results are heine:~/programs/gambiteer/gambit> !py python pi_chudnovsky_bs_gmpy.py 31415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679 ('chudnovsky_gmpy_mpz_bs: digits', 10, 'time', 1.0967254638671875e-05) ('chudnovsky_gmpy_mpz_bs: digits', 100, 'time', 3.0040740966796875e-05) Last 5 digits 70679 OK ('chudnovsky_gmpy_mpz_bs: digits', 1000, 'time', 0.00025582313537597656) Last 5 digits 01989 OK ('chudnovsky_gmpy_mpz_bs: digits', 10000, 'time', 0.00386810302734375) Last 5 digits 75678 OK ('chudnovsky_gmpy_mpz_bs: digits', 100000, 'time', 0.0834801197052002) Last 5 digits 24646 OK ('chudnovsky_gmpy_mpz_bs: digits', 1000000, 'time', 1.655979871749878) Last 5 digits 58151 OK ('chudnovsky_gmpy_mpz_bs: digits', 10000000, 'time', 30.67442488670349) Last 5 digits 55897 OK heine:~/programs/gambiteer/gambit> gsi chud1.scm Chudnovsky's algorithm using binary splitting in Gambit Scheme: digits 10, CPU time: 0.. Last 5 digits 26535. Chudnovsky's algorithm using binary splitting in Gambit Scheme: digits 100, CPU time: 0.. Last 5 digits 70679. Chudnovsky's algorithm using binary splitting in Gambit Scheme: digits 1000, CPU time: .004. Last 5 digits 1989. Chudnovsky's algorithm using binary splitting in Gambit Scheme: digits 10000, CPU time: .028. Last 5 digits 75678. Chudnovsky's algorithm using binary splitting in Gambit Scheme: digits 100000, CPU time: .472. Last 5 digits 24646. Chudnovsky's algorithm using binary splitting in Gambit Scheme: digits 1000000, CPU time: 6.448. Last 5 digits 58151. Chudnovsky's algorithm using binary splitting in Gambit Scheme: digits 10000000, CPU time: 98.612. Last 5 digits 55897. So it appears that for this algorithm applied to large integers, GMP's bignum routines are about 3-4 times as fast as Gambit's bignum routines. Not so bad. For smaller bignums, GMP has a bigger advantage. The C program gmp-chudnovsky.c includes certain optimizations to this basic algorithm: http://gmplib.org/pi-with-gmp.html ftp://ftp.gmplib.org/pub/misc/gmp-chudnovsky.c On my machine, compiled with gcc -O3 -march=native -o gmp-chudnovsky gmp-chudnovsky.c -lgmp -lm the CPU times for 1,000,000 and 10,000,000 digits are 1.064 and 18.200 seconds, respectively. This is with a somewhat older machine model name : Intel(R) Core(TM)2 Quad CPU Q8200 @ 2.33GHz running Ubuntu 13.04 with heine:~/programs/gambiteer/gambit> gcc -v Using built-in specs. COLLECT_GCC=gcc COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-linux-gnu/4.7/lto-wrapper Target: x86_64-linux-gnu Configured with: ../src/configure -v --with-pkgversion='Ubuntu/Linaro 4.7.3-1ubuntu1' --with-bugurl=file:///usr/share/doc/gcc-4.7/README.Bugs --enable-languages=c,c++,go,fortran,objc,obj-c++ --prefix=/usr --program-suffix=-4.7 --enable-shared --enable-linker-build-id --libexecdir=/usr/lib --without-included-gettext --enable-threads=posix --with-gxx-include-dir=/usr/include/c++/4.7 --libdir=/usr/lib --enable-nls --with-sysroot=/ --enable-clocale=gnu --enable-libstdcxx-debug --enable-libstdcxx-time=yes --enable-gnu-unique-object --enable-plugin --with-system-zlib --enable-objc-gc --with-cloog --enable-cloog-backend=ppl --disable-cloog-version-check --disable-ppl-version-check --enable-multiarch --disable-werror --with-arch-32=i686 --with-abi=m64 --with-multilib-list=m32,m64,mx32 --with-tune=generic --enable-checking=release --build=x86_64-linux-gnu --host=x86_64-linux-gnu --target=x86_64-linux-gnu Thread model: posix gcc version 4.7.3 (Ubuntu/Linaro 4.7.3-1ubuntu1) heine:~/programs/gambiteer/gambit> gsi -v v4.6.9 20130607151908 x86_64-unknown-linux-gnu "./configure '--enable-single-host' '--enable-multiple-versions' '--enable-shared'" and the Ubuntu-provided GMP 5.0.5. (I'm sure the GMP folks have a better way to build GMP on my machine than the "generic" 64-bit version provided by Ubuntu.) Brad

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ICFP 2021 Student Research Competition: Call for Submissions
by Sam Tobin-Hochstadt 16 Jui '21

16 Jui '21

ICFP 2021 Student Research Competition Call for Submissions ICFP invites students to participate in the Student Research Competition, which will be held virtually alongside the main conference, in order to present their research and receive feedback from prominent members of the programming language research community. As usual, the SRC consists of three rounds: * Extended abstract * Poster session at ICFP 2021 * ICFP presentation To make the virtual competition fruitful, we will make sure that every student will have an "invited audience" during the poster session. We are also planning to organize a social event for the students. Please visit the SRC website for updates. ### Important Dates Submissions due: 2 July 2021 (Friday) https://icfp21src.hotcrp.com Notification: 16 July 2021 (Friday) Conference: 22 August (Sunday) - 27 August (Friday) ### Submission Details Each submission (referred to as "abstract" below) should include the student author’s name and e-mail address; institutional affiliation; research advisor’s name; ACM student member number; category (undergraduate or graduate); research title; and an extended abstract addressing the following: * Problem and Motivation: Clearly state the problem being addressed and explain the reasons for seeking a solution to this problem. * Background and Related Work: Describe the specialized (but pertinent) background necessary to appreciate the work in the context of ICFP areas of interest. Include references to the literature where appropriate, and briefly explain where your work departs from that done by others. * Approach and Uniqueness: Describe your approach in addressing the problem and clearly state how your approach is novel. * Results and Contributions: Clearly show how the results of your work contribute to programming language design and implementation in particular and to computer science in general; explain the significance of those results. * Submissions must be original research that is not already published at ICFP or another conference or journal. One of the goals of the SRC is to give students feedback on ongoing, unpublished work. Furthermore, the abstract must be authored solely by the student. If the work is collaborative with others and*or part of a larger group project, the abstract should make clear what the student’s role was and should focus on that portion of the work. * Formatting: Submissions must be in PDF format, printable in black and white on US Letter sized paper, and interpretable by common PDF tools. All submissions must adhere to the "ACM Small" template that is available (in both LaTeX and Word formats) from https://www.acm.org/publications/authors/submissions. For authors using LaTeX, a lighter-weight package, including only the essential files, is available from http://sigplan.org/Resources/Author/#acmart-format. The submission must not exceed 3 pages in PDF format. Reference lists do not count towards the 3-page limit. Further information is available at the ICFP SRC website: https://icfp21.sigplan.org/track/icfp-2021-Student-Research-Competition Program Committee: Chair: Anders Miltner (UT Austin) Andreea Costea (NUS Singapore) Andrew Hirsch (MPI-SWS) Liam O'Connor (University of Edinburgh) Lionel Parreaux (HKUST) Daming Zou (ETH Zurich)

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building git master fails
by Jörg F. Wittenberger 04 Jui '21

04 Jui '21

trying to build the master branch from githug fails I followed the steps from INSTALL.txt section 1 §2 (wget ...gambit-4_9_3-devel.tar.gz et.c) followed ./configure --enable-single-host --prefix=~/test make make bootstrap git pull make realclean # again: ./configure --enable-single-host --prefix=~/test make ---- The resulting ___CHARALPHABETICP being undefined I solved by adding a line to config.h.in: #define ___USE_C_RTS_CHAR_OPERATIONS But the "Ill-placed 'declare'" in _num.scm line 5525 is above my head. Looks an issue with `define-prim&proc` -- but I don't understand it. Any help appreciated. best Jörg

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Call for Tutorial, Panel, and Discussion Proposals: ICFP 2021
by Sam Tobin-Hochstadt 02 Jui '21

02 Jui '21

CALL FOR TUTORIAL, PANEL, AND DISCUSSION PROPOSALS ICFP 2020 25th ACM SIGPLAN International Conference on Functional Programming August 22 - 27, 2021 Virtual https://icfp21.sigplan.org/ The 25th ACM SIGPLAN International Conference on Functional Programming will be held virtually on August 22-27, 2021. ICFP provides a forum for researchers and developers to hear about the latest work on the design, implementations, principles, and uses of functional programming. Proposals are invited for tutorials, lasting approximately 3 hours each, to be presented during ICFP and its co-located workshops and other events. These tutorials are the successor to the CUFP tutorials from previous years, but we also welcome tutorials whose primary audience is researchers rather than practitioners. Tutorials may focus either on a concrete technology or on a theoretical or mathematical tool. Ideally, tutorials will have a concrete result, such as "Learn to do X with Y" rather than "Learn language Y". Just like last year, following the success of the #ShutDownPL event @ ICFP, we are also inviting proposals for panels and discussions on topics of broader interest to the PL community. Tutorials, panels, and discussions may occur before or after ICFP, co-located with the associated workshops, on August 22 or August 26-27. ---------------------------------------------------------------------- Submission details Deadline for submission: June 28th, 2020 Notification of acceptance: July 5th, 2020 Prospective organizers of tutorials are invited to submit a completed tutorial proposal form in plain text format to the ICFP 2021 workshop co-chairs (Leonidas Lampropoulos and Zoe Paraskevopoulou), via email to icfp-workshops-2021(a)googlegroups.com by June 28th, 2021. Please note that this is a firm deadline. Organizers will be notified if their event proposal is accepted by July 5th, 2021. The proposal form is available at: http://www.icfpconference.org/icfp2021-files/icfp21-panel-form.txt http://www.icfpconference.org/icfp2021-files/icfp21-tutorials-form.txt ---------------------------------------------------------------------- Selection committee The proposals will be evaluated by a committee comprising the following members of the ICFP 2021 organizing committee. Tutorials Co-Chair: Zoe Paraskevopoulou (Northeastern) Tutorials Co-Chair: Leonidas Lampropoulos (University of Maryland) General Chair: Sukyoung Ryu (KAIST) Program Chair: Ron Garcia (University of British Columbia) ---------------------------------------------------------------------- Further information Any queries should be addressed to the tutorial co-chairs ( Leonidas Lampropoulos and Zoe Paraskevopoulou), via email to icfp-workshops-2021(a)googlegroups.com

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