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Trying to run Gambit benchmarks
by Shawn Hyam 12 Jan '07

12 Jan '07

To get started with Gambit, I decided to try running the benchmark suite that was included in the tarball. I started with one of the examples: ./bench gambit "fib tak" This ran fine and gave me some results. However, when I tried this: ./bench gambit-int "fib" I got this: *** ERROR IN "fib.scm"@60.1 -- Ill-placed 'define-macro' 0.01 real 0.01 user 0.00 sys Also, when I tried running with a different benchmark setting, such as: ./bench -s fixflo gambit "fib" I get another error, this time: Running... *** WARNING -- Variable "fxring+" used in module "fib.o1" is undefined *** WARNING -- Variable "fxring-" used in module "fib.o1" is undefined *** ERROR IN fib -- Operator is not a PROCEDURE (#!unbound 35 1) Can any of the experts provide some pointers for me here? I'd have more persistence in debugging my own code if I could get the benchmarks working. I'm running on a MacBook with OS X 10.4.8 if it matters. thanks Shawn

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Multiprocessor support
by Jeremy Hughes 05 Jan '07

05 Jan '07

> The design of the multiprocessor support has not advanced. What kind > of task are you simulating? Is it one simulation or several small > simulations? > > Marc Is multiprocessor support likely to advance some time within the next two or three years? Jeremy

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FFI float/int interoperability?
by TJ 23 Déc '06

23 Déc '06

Is there a way to make Gambit behave like C when passing floats/ints to and from foreign functions? I mean to have them automatically converted as they would be if I were programming in C. I've run into a problem where I have 2 variables (in Scheme) to keep track of my OpenGL window's width and height, but the calls to OpenGL expect floats (gluOrtho2D) while the calls to SDL expects ints (SDL_SetVideoMode). If there isn't a way to convert automatically, is there a Scheme function to convert between these two types? I suppose I could write them myself, but since I'm already asking... TJ

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Re: [gambit-list] Multiprocessor support
by Christian 06 Déc '06

06 Déc '06

(PS. re cj-posix: I've noticed that I forgot to prevent "interrupts" from happening in the fork* routine; currently there's a small time window where other gambit threads still can run in the child. I'll fix this asap.)

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Re: [gambit-list] Multiprocessor support
by Daniel Sadilek 06 Déc '06

06 Déc '06

Hello, > (Generally: multiple processes and data passing (open-process, or on > unix fork() and pipe() or possibly mmap() (poke me if you want me to > release an updated cj-posix library), or (as mentioned) Termite).) I had a look at your cj-posix library. Maybe that's a starting point for me. As I understand, when I fork, all (not just the current) Gambit-threads will be forked and the communication has to be done by pipes. Is it possible to have only the current thread forked and to have shared data structures or do you have any idea how that could be emulated (and elegantly abstracted)? Do you have a simple hello world example? > I've started writing bindings for PETSc[1] (without a timeline for > completion). That library can do multiprocessing (even across a whole > cluster). Are you interested in those? I'm not sure. Can this library help me to run the _Scheme_code_ on multiple processors? Thank you Daniel Sadilek

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Multiprocessor support
by Daniel Sadilek 06 Déc '06

06 Déc '06

Hello, I want to use Gambit for simulation purposes on a multiprocessor machine. I've read in the manual that Gambit does not support multiprocessor machines at the moment. A few months ago there was a discussion on the mailing list about that matter and it sounded as if multiprocessor support was planned. Is there any (preliminary) support? Or can you suggest some kind of workaround? I could imagine to run multiple instances of Gambit that can run on multiple processors and communicate with each other -- perhaps someone has done that already and has a library for that? Best regards Daniel Sadilek

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leaps not leaping
by |/|/ Bendick 06 Déc '06

06 Déc '06

Is there something wrong with the current debugger? When I do a leap it appears to be doing the same thing as a step. Compare the following with http://www.iro.umontreal.ca/~gambit/doc/gambit-c_5.html#IDX121 % gsi Gambit Version 4.0 beta 20 > (define (fact n) (if (< n 2) 1 (* n (fact (- n 1))))) > (step-level-set! 1) > (begin (step) (fact 5)) *** STOPPED IN (console)(a)3.15 1> ,s | > (fact 5) *** STOPPED IN fact, (console)(a)1.22 1> ,s | | > (< n 2) | | #f *** STOPPED IN fact, (console)(a)1.43 1> ,s | | > (- n 1) | | 4 *** STOPPED IN fact, (console)(a)1.37 1> ,s | | > (fact (- n 1)) *** STOPPED IN fact, (console)(a)1.22 1> ,s | | | > (< n 2) | | | #f *** STOPPED IN fact, (console)(a)1.43 1> ,s | | | > (- n 1) | | | 3 *** STOPPED IN fact, (console)(a)1.37 1> ,l | | | > (fact (- n 1)) *** STOPPED IN fact, (console)(a)1.22 1> ,l | | | | > (< n 2) | | | | #f *** STOPPED IN fact, (console)(a)1.43 1> ,l | | | | > (- n 1) | | | | 2 *** STOPPED IN fact, (console)(a)1.37 1> -- |/|/ Bendick

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SHA1 in Gambit
by |/|/ Bendick 06 Déc '06

06 Déc '06

Anyone have (or know of) an efficient way of getting a sha1 digest of some data in gambit? All I could find was http://www-pu.informatik.uni-tuebingen.de/users/knauel/sw/myscsh/sha1.scm which (after minor hacking) can do: (time (sha1-hash-byte-vector (make-u8vector 1000000))) 301187 ms real time 135097 ms cpu time (130412 user, 4685 system) 25815 collections accounting for 108377 ms real time (46618 user, 1795 system) 3598449540 bytes allocated no minor faults no major faults 1090135108572819471271096978636225236080936489142 Way too slow for even moderately large data. Can anyone help? -- |/|/ Bendick

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PS/Tk on Gambit
by Jeff Read 04 Déc '06

04 Déc '06

Hi all, I managed to get Nils M. Holm's PS/Tk running on Gambit. I had to account for a subtle R5RS incompatibility in Gambit, which is that colon-terminated identifiers are keywords -- a set disjoint from the set of symbols. PS/Tk uses such identifiers to indicate options passed to wish for the creation of widgets. That said, it's an interesting hack, and it works well once this discrepancy has been addressed. Now we can enjoy a quick and easy way to get a GUI for our Gambit applications! The complete source file is at: http://ii-0-ii.com/parodycheck/software/tk-gambit.scm --Jeff

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Gambit-C Debian 4.0b20 Packages Available
by Kurt B. Kaiser 02 Déc '06

02 Déc '06

Debian source and binary packages for 11 platforms are now available in the Testing and Unstable distributions. The m68k architecture is still building - gambc should reach the head of the queue in another week. These packages have been built with the --use-single-host configure option. The Alioth file download is discontinued. Please use apt-get to access these packages in the Debian repositories: apt-get install gambc The Gambit-C manual is available using the info system, doc-base, or by accessing the pdf at /usr/share/doc/gambc-doc. It is installed separately: apt-get install gambc-doc Problems with the packaging should be reported to the Debian bug tracker. http://www.debian.org/Bugs/ Problems with Gambit-C should be reported to the Gambit tracker, though they will be forwarded if received in Debian. -- KBK

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