Gambit-list Septembre 2008

gambit-list@iro.umontreal.ca

24 participants
33 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/

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Gambit installer
by Adrien Pierard 01 Oct '08

01 Oct '08

Hi everyone. With the new version of Gambit, I decided to take some time to fix the installer and chose to install gambit in $prefix/bin/{gsi-$version,gsc-$version} $prefix/lib/gambit-c/$version $prefix/doc/gambit-c/$version $prefix/share/gambit-c/$version $prefix/info/gambit-c/$version $prefix/include/gambit-c/$version (the hardcoded "gambit-c" couls also be a variable, for those who run only one version of gambit and want to install directly into the $prefix subtree.) This should hopefully allow those who want to run several versions of gambit at once to do so (which explains the current behaviour of the installer), and also avoid clashes with names already taken by other binaires (such as ghostscript). Yet, there's two issues for which I need your advice: - Where should I put syntax-case.scm? - What happens to the shortcut "~~" in file paths? ideally, "~~" should be expanded by the binaries into the corresponding path (such as $prefix/lib/gambit-c/$version) where everything needed is found, and where I plan to put syntax-case.scm The aim of this "fix" is to make gambit fully portable and configurable on as many OSs as possible. So ? Adrian -- "I am not a Church numeral; I am a free variable!" (The Scheme Underground) For every complex problem, there is a solution that is simple, neat, and wrong.

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Re: [gambit-list] Gambit installer
by Robert D. Skeels 01 Oct '08

01 Oct '08

I would like to see an option at configure stage to remove the version from the path, in order to honor the --prefix= path I set before compile. It is tiresome to edit PATH variables in .cshrc every time Gambit's version changes. Note I am requesting this as something we would explicitly pass at configure, the default would remain as is. I understand the logic and reasoning for current pathnames. However, it would be nice for those of us used to conventional bsd filesystem layouts to have Gambit install in expected directories. I'm no expert in makefiles, but it shouldn't be more than a conditional statement to include PACKAGE_SUBDIR or not, no?

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A proper way to allocate memory in C extensions
by Frederick LeMaster 30 Sep '08

30 Sep '08

Is there a proper way to allocate memory for c extensions that will be compiled under both C and C++ versions of gambit? In the Xlib example this is used: (define (make-XColor-box) ((c-lambda () XColor* "___result_voidstar = ___EXT(___alloc_mem) (sizeof (XColor));"))) Should I do that for foreign objects/structs? What is the proper macro to free memory allocated this way?

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New define-type wiki page
by David St-Hilaire 29 Sep '08

29 Sep '08

Hi all, I just wanted to let you know that I added a page on the wiki that is a translation of some of Marc's slides which indicate how to use the define-type special form, and most importantly lists all the options available (with some exemple code). link: http://dynamo.iro.umontreal.ca/~gambit/wiki/index.php/Define-type I think it could be usefull since I don't believe this information appears in the official doc. David

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Eclipse-based Scheme Debugger
by William Cook 29 Sep '08

29 Sep '08

I've uploaded a first working version of my Scheme IDE based on Eclipse. Its called Schemeide http://schemeide.sourceforge.net/ Right now it mostly does auto-formatting and debugging. It works with Gambit 4.2.9 on MacOS, Win32, and Linux. It is still alpha quality, with many features still to do. But it seems to be usable, at least for easy stack inspection of problems. Function breakpoints still need to be entered manually. And the interaction between the output window and debug mode is not good. I'll be working on it since I'm using it daily in my Scheme work. If anyone wants to help, please let me know. Feedback is welcome. William Cook http://www.cs.utexas.edu/users/wcook

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Bug with unsigned-long-long C type
by Arnaud Bergeron 29 Sep '08

29 Sep '08

Basically, the conversion macros for it and long-long are not defined. So you get errors like this: warning: implicit declaration of function '___BEGIN_CFUN_SCMOBJ_TO_ULONGLONG' And the code does not compile. Arnaud

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[ANN] Gambit-C v4.2.9 released
by gambit＠iro.umontreal.ca 28 Sep '08

28 Sep '08

1 0

Help With Memory
by Joel J. Adamson <adamsonj＠email.unc.edu> 27 Sep '08

27 Sep '08

Dear Gambitizers, I have programmed a simulation, and the list has successfully helped me with a few prior problems. Those are taken care of, but now I have a much more basic problem: I'm using up memory, to the point where my kernel (named after a certain Finn) # uname -srmp Linux 2.6.26-custom i686 Intel(R) Core(TM)2 Quad CPU Q6700 @ 2.66GHz kills the program. Of course I had the common misconception that this would never happen in a Lisp-like language and on and on: my real concern is that there is some basic programming technique that I am missing. Basically, is something failing to get garbage-collected? I will discuss a specific problem below, but I ask the kind generosity of someone who could examine the code (or show me how to better examine it), and let me know if there are any major red-flags, or ways I could improve it. My basic goal is that since I really enjoy programming in Scheme, I'd like to avoid having to do this in FORTRAN on the big ol' supercomputer here. Yes, I am in school, but my adviser had never heard of Scheme before I mentioned it to her ;) To stop the memory allocation problem, I attempted to install an exception handler: (define (mem-handler exc) (if (or (heap-overflow-exception? exc) (stack-overflow-exception? exc)) (if (noncontinuable-exception? exc) (abort exc) exc) (with-exception-catcher error-handler (lambda () (raise exc))))) And then run the main driving routine within this like so: (with-exception-handler mem-handler (lambda () (gen-sim-data))) Here's what happens when I run it: chondestes: /home/joel/lisp/scm/agjones> nice -n +10 jonesim -:m1000000,dR- *** WARNING -- Variable "gsl-vector" used in module "genxic.o1" is undefined .9999107177669622 2000 50 16 2 1000. .5 0. 0. 0. 1e-4 1. .25 true .9999111243206196 2000 50 16 2 1000. .5 0. 0. 0. 1e-4 1. .25 false .9999110166041458 2000 50 16 2 1000. .5 0. 0. 0. 1e-4 1. .75 true .9999111775781226 2000 50 16 2 1000. .5 0. 0. 0. 1e-4 1. .75 false .9999108917731552 2000 50 16 2 1000. .5 0. 0. 0. .09 1. .25 true .9999104499002971 2000 50 16 2 1000. .5 0. 0. 0. .09 1. .25 false .9999107898981544 2000 50 16 2 1000. .5 0. 0. 0. .09 1. .75 true zsh: killed nice -n +10 jonesim -:m1000000,dR- Thanks for any help you can offer, Joel Getting the code ================ The code is available for public download from svn at http://chondestes.bio.unc.edu/svn/models/agjones A simple "make" in the top directory will yield a single executable that reads "input.txt." The critical parameter is "N," the first variable in "input.txt." I have tested this at 10, 100, and 2000, and it only finishes successfully at N=10. To run it you will need the loadable library "genxic.o1" from the package located at http://chondestes.bio.unc.edu/svn/genxic/trunk To build the library, do a "make" in the scm/ directory, then copy it to the top directory of agjones/. -- Joel J. Adamson University of North Carolina at Chapel Hill CB #3280, Coker Hall Chapel Hill, NC 27599-3280 Before you reply to this email, please read http://www.unc.edu/~adamsonj/email-howto.html

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Gambit-list Septembre 2008