Gambit-list Juillet 2009

gambit-list@iro.umontreal.ca

25 participants
31 discussions

Edge triggered I/O with libevent
by Adam Langley 04 Avr '13

04 Avr '13

Gambit uses the select call on POSIX systems to multiplex IO operations. This is fine for small numbers of file descriptors, but falls apart quickly with large numbers[1]. libevent[2] is a wrapper library around a number of modern IO multiplexing systems (epoll on Linux, kqueue on the BSDs as well as poll and select). Attached is a patch which converts Gambit to using edge triggered I/O with epoll and libevent. This also requires a patch (attached) of libevent since the standard distribution doesn't include edge triggering support and the upstream appears to be on holiday. (epoll is required because I don't have a BSD box on which to develop edge triggering support for kqueue) This patch (for Gambit) preprocesses away to nothing unless --enable-libevent is passed to the configure script. (Note that, since this patches the configure.ac script, you'll need to run autoconf to regenerate). I hope I've not broken anything, but at this stage I've only tested that the console and tcp ports work. This patch (in the future) should also allow people, who write programs which use socket calls directly, to integrate into the main event loop at some point. Testing is more than welcome and, if you find a form of IO which is broken, please email me. [1] http://monkey.org/~provos/libevent/libevent-benchmark2.jpg [2] http://monkey.org/~provos/libevent/ -- Adam Langley agl(a)imperialviolet.org http://www.imperialviolet.org (+44) (0)7906 332512 PGP: 9113 256A CC0F 71A6 4C84 5087 CDA5 52DF 2CB6 3D60

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Interactive 3D graphics with Gambit-C
by Alex Sandro Queiroz e Silva 06 Jan '10

06 Jan '10

Hallo, I am thinking about doing some basic 3D graphics with Gambit-C. Although I am sure code generated by Gambit-C is fast enough[1], I am a bit worried about the garbage collector. What's the type of garbage collector used by Gambit? If it kicks in during interactive rendering, should I expect annoying pauses? [1] - http://www.ventonegro.org/2008/09/the-need-for-speed/ -alex http://www.ventonegro.org/

5 7

Re: [gambit-list] Speed improvement of lib/digest.scm
by Marc Feeley 18 Nov '09

18 Nov '09

On 19-Feb-09, at 4:49 PM, Mikael More wrote: > Cool! > > Useful! > > What is the approx speed on your machine btw? > On my 2GHz Mac Book Pro: For MD5: 0.06 seconds per MB. For SHA-1: 0.13 seconds per MB. That's still about 3 times slower than the "md5" utility on my machine, but still not too bad for bit-bashing code entirely written in Scheme. Marc

4 10

bindings to GSL
by michele.zaffalon＠gmail.com 29 Sep '09

29 Sep '09

Hi, I am looking for bindings to the GSL library. Is there some initial work already done that I could use? Thanks, michele

3 2

Re: [gambit-list] scheme on llvm
by Harold Ancell 31 Jul '09

31 Jul '09

At 02:19 AM 7/31/2009, lowly coder wrote: >I've been on gambit for 6+ months now; and the more I dig into the >internal *.scm's, the more I'm impressed -- anyone interested in >forming a group to port this to LLVM as an exercise to better >understand gambit internals? Something like meeting on irc 15 minutes >every week or so to discuss would be really nice. I'm very interested, but I just got tasked with creating a web site of some sophistication and it looks like I'll be drawn to the Clojure side of the Force, which at minimum will be educational (e.g. it's by default functional). But who knows.... Back then I got a snapshot of the initial cut by Arnaud Bergeron and Mathieu Larose from the former for placement in the Dumping Grounds, but didn't get a release from the latter for putting it there; I didn't try very hard at all and didn't follow up. Mathieu, say the word and I'll put that snapshot up. >On Thu, Jul 30, 2009 at 9:50 PM, Bradley Lucier<lucier(a)math.purdue.edu> wrote: >> >> On Jul 31, 2009, at 12:39 AM, Nguyen Thai Ngoc Duy wrote: >> >>> It's six months since this post. Any progress on the llvm backend? >> >> The last time I compiled the Gambit-generated C code with LLVM (which >> wasn't so long ago) gsi failed at startup. (I know this isn't what >> you're referring to, but I presume the LLVM compiler may have the >> same difficulties compiling the LLVM intermediate representation.) Hmmmm; I assume you used the gcc front end instead of Clang? - Harold

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scheme on llvm
by lowly coder 31 Jul '09

31 Jul '09

this is kinda off topic, -- but people here seem really smart, so I'll risk the occasional flames for good criticism + insight i think the llvm/jvm projects are really cool, since so much work is put into jitting; and for one reason or another, I like llvm more than jvm i'm curious about the possiblity of a high performance scheme (and perhaps gambit in particular) running on llvm; where the 'initial implementation' may not be all that fast ... but letting llvm jit it away how does this sound? feasible for a scheme (but not gambit)? down the pipes planned for gambit? or totally stupid/crazy? the 'main' advantage of this approach is that I _assume_ that the llvm guys are pretty good at hacking up interpreters / jit's ... so why not benefit from their constant progress :-D

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Re: [gambit-list] error running with emacs in windows xp
by Oisín 30 Jul '09

30 Jul '09

This is a somewhat old thread, but I'm getting this same behaviour on my Windows Vista box at work with Gambit 4.4.3 and 4.4.4 (it's never happened on my OS X machine) - ^D starts a spammy infinite loop: ;;;; Gambit v4.4.4 > (go-into-a-weird-infinite-loop-because-this-symbol-is-unbound) *** ERROR IN (stdin)(a)1.2 -- Unbound variable: go-into-a-weird-infinite-loop-because-this-symbol-is-unbound 1> *** ERROR IN (stdin)(a)1.2 -- The pipe has been ended. (peek-char '#<input-port #2 (stdin)>) 1> *** ERROR IN (stdin)(a)1.2 -- The pipe has been ended. (peek-char '#<input-port #2 (stdin)>) 1> *** ERROR IN (stdin)(a)1.2 -- The pipe has been ended. (peek-char '#<input-port #2 (stdin)>) ;;;; It spams the console in Emacs until I send a kill signal. As before, debugger commands like ,t and ,d work fine though. Do I have Emacs configured wrong (after all, I can be pretty dumb), or is this a regression? Oisín

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namespace woes
by lowly coder 27 Jul '09

27 Jul '09

~$ cat test.scm (define bleh 10) (##namespace ("foo#")) (##include "~~lib/gambit#.scm") (define + 20) (define blah 20) (define bleh 20) (##namespace ("")) (pp `(+ ,+)) (pp `(bleh ,bleh)) (pp `(blah ,blah)) ; what's going on? ~$ gsi test.scm (+ 20) (bleh 10) *** ERROR IN "test.scm"@13.13 -- Unbound variable: blah what happened? how did I just rebind + ? I thought it would only affect foo#+ furthermore, it also seems to have effect on varaibles like "angle" Thanks!

2 1

blackhole fixes
by moochee＠gmx.net 26 Jul '09

26 Jul '09

Hello dear all, while trying to port Alex Shinn's fmt to blackhole (not finished yet) i faced some difficulties resulting in the attached patch. I am neither familiar with black hole nor with the subleties of gambit. I hope this is the right place for discussion. The Black-Hole page seems to be unreachable for several days now. let-optionals: the hunk addressing optionals changes ,,body ...'' in (let-optionals* arglst ((var default) ...) body ...) to be wrapped into a let-form instead of a begin-form. This is what fmt seems to expect as the body starts with define-expressions leading to a complaint of gambit about misplaced expressions. Of course i could modify the fmt code to solve the problem at hand. But as the code seems to be working on other schemes it might be what other schemers expect. At least i don't see any drawbacks from doing so. As the begin-expresion will be wrapped into an outer let-expression anyway this modification should be completely transparent besides the gain expressive freedom. srfi/13 string-index: The result of an argument sanity check was passed along instead of the checked argument itself. srfi/13 char-cased char-titlecase: These are quick hacks. I didn't find them defined anywhere. Not sure whether this actually led to an error or not. srfi/14 char-set?: Black hole seems not to deal correctly with define-record-type. Instead of fixing the cause, i decided to provide this quick hack for the apparent problem of not exporting ,,char-set?''. Bye Tara

1 0

24 Jul '09

2009 Workshop on Scheme and Functional Programming Coordinated with the Symposium in Honor of Mitchell Wand August 22, 2009 Boston, Massachusetts, USA http://www.schemeworkshop.org/2009 CALL FOR PARTICIPATION To the delight of all and sundry, the 2009 Scheme and Functional Programming Workshop will be held on August 22nd at Northeastern University, and it is a signal honor for me to be able to invite YOU to the WORLD'S FOREMOST WORKSHOP on the marvelous Scheme language, and to present a program PACKED with contributions from familiar faces and new ones, certain to amaze, delight, and edify. Lend us your ears, and we will widen the space between them. - John Clements IMPORTANT DATES August 11, 2009 - Registration deadline August 22, 2009 - Workshop on Scheme and Functional Programming August 23-24, 2009 - Symposium in Honor of Mitchell Wand: http://www.ccs.neu.edu/events/wand-symposium VENUE Northeastern University Boston Massachusetts Building and Room TBA ACCOMMODATION A limited block of hotel rooms has been reserved for participants of the Scheme Workshop and/or the Mitchell Wand Symposium at hotels in Cambridge and Boston. See the workshop web site for more information, and please note that some of these special rates expire soon (one as early as July 27th). REGISTRATION The registration fee will be $40 to help cover the operating costs and lunch accommodations. Please register by *August 11, 2009* so that we will have an accurate head count. To register, please send an email to aoeuswreg(a)brinckerhoff.org with your name and any dietary restrictions for lunch. PROGRAM COMMITTEE * John Clements (Cal Poly State University (organizer & chair)) * Dominique Boucher (Nu Echo) * Abdulaziz Ghuloum (Indiana University) * David Herman (Northeastern University) * Shriram Krishnamurthi (Brown University) * Matthew Might (University of Utah) * David Van Horn (Northeastern University) PRELIMINARY PROGRAM Invited Talk on the Bootstrap Program Emmanuel Schanzer Invited Talk on Future Directions for the Scheme Language The Newly Elected Scheme Language Steering Committee The Scribble Reader: An Alternative to S-expressions for Textual Content Eli Barzilay World With Web: A compiler from world applications to JavaScript Remzi Emre Başar, Caner Derici, Çağdaş Şenol Scalable Garbage Collection with Guaranteed MMU William D Clinger, Felix S. Klock II Distributed Software Transactional Memory Anthony Cowley Sequence Traces for Object-Oriented Executions Carl Eastlund, Matthias Felleisen Keyword and Optional Arguments in PLT Scheme Matthew Flatt, Eli Barzilay Fixing Letrec (reloaded) Abdulaziz Ghuloum, R. Kent Dybvig Descot: Distributed Code Repository Framework Aaron W. Hsu A pattern-matcher for miniKanren -or- How to get into trouble with CPS macros Andrew W. Keep, Michael D. Adams, Lindsey Kuper, William E. Byrd, Daniel P. Friedman Randomized Testing in PLT Redex Casey Klein, Robert Bruce Findler Screen-Replay: A Session Recording and Analysis Tool for DrScheme Mehmet Fatih Köksal, Remzi Emre Başar, Suzan Üsküdarlı Interprocedural Dependence Analysis of Higher-Order Programs via Stack Reachability Matthew Might, Tarun Prabhu Get stuffed: Tightly packed abstract protocols in Scheme John Moore Higher-Order Aspects in Order Eric Tanter Peter J Landin (1930-2009) Olivier Danvy

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Gambit-list Juillet 2009