Re: [Haskell-cafe] GHC 6.7 on Windows / containers-0.1 package?
Thanks for the info, very interesting. Yes, I'm using GHCi, and I'm using forkOS, and I'm using OpenGL... Since I'm used to write heavily multi-threaded/multi-core code in imperative languages, I would like to understand more about the existing execution models, and those black holes... Understanding the low-level details helps a lot for me. Actually the problem was caused by (yet another) strict pattern match in my code, which should have been lazy. I find it strange that this would cause 0% CPU time... But then again I don't understand the details of how GHCi/GHC works. I did read the book Modern Compiler Design (http://www.cs.vu.nl/~dick/MCD.html) which implements a basic Haskell interpreter compiler, so I got an introduction. Anyway, it's a very good learning experience for me to redo FRP from scratch, as I encounter all pitfalls (such as the need for memoization when using recursive streams, the need for lazy pattern matching, the space leaks sneaking up on you, etc). Once I get to understand these in detail, I'll try to re-read the existing papers on FRP, which I hardly understood initially :-) Thanks, Peter Stefan O'Rear wrote: On Wed, Sep 19, 2007 at 10:24:24PM +0100, Neil Mitchell wrote: Hi Peter, So I grabbed ghc-6.7.20070824 (=the latest one for Windows I could find) and the extra-libs, compiled and installed the GLUT package (which I needed), but when I compile my library, I get Could not find module `Data.Map': it is a member of package containers-0.1, which is hidden All dependencies etc. have changed when going to 6.7/6.8 - you are probably better off using 6.6.1 for now. I also don't think that the debugger will help you track down infinite loop style errors. You might be better off posting the code and asking for help. You said 0% CPU. That's *very* important. It means that you are using the threaded runtime (GHCi?), and that you triggered a blackhole. You should be able to handle this by compiling your program with -prof (do *not* use -threaded!), and running with +RTS -xc. With luck, that will give you a backtrace to the infinite loop. PS. blackholes are a serious dark corner of GHC's execution model, chances are better than even that if you try to use the debugger for this you will discover a new and (for you) crippling bug. I wouldn't recommend it. Stefan ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] GHC 6.7 on Windows / containers-0.1 package?
All dependencies etc. have changed when going to 6.7/6.8 - you are probably better off using 6.6.1 for now. That's a petty. I really would like to experiment with the debugger :-) ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] GHC 6.7 on Windows / containers-0.1 package?
On 9/21/07, Peter Verswyvelen [EMAIL PROTECTED] wrote: Since I'm used to write heavily multi-threaded/multi-core code in imperative languages, I would like to understand more about the existing execution models, and those black holes... Understanding the low-level details helps a lot for me. I think you want to know about the STG, the Spineless Tagless G-Machine. If I'm correct, that's how GHC works behind the scenes. -- Felipe. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] GHC 6.7 on Windows / containers-0.1 package?
All dependencies etc. have changed when going to 6.7/6.8 - you are probably better off using 6.6.1 for now. That's a petty. I really would like to experiment with the debugger :-) Me too! A proper release of GHC 6.8 is very nearby, so you should get your wish then. Thanks Neil ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] GHC 6.7 on Windows / containers-0.1 package?
On Fri, Sep 21, 2007 at 05:40:59PM -0300, Felipe Almeida Lessa wrote: On 9/21/07, Peter Verswyvelen [EMAIL PROTECTED] wrote: Since I'm used to write heavily multi-threaded/multi-core code in imperative languages, I would like to understand more about the existing execution models, and those black holes... Understanding the low-level details helps a lot for me. I think you want to know about the STG, the Spineless Tagless G-Machine. If I'm correct, that's how GHC works behind the scenes. STG is a very pretty island, but it's just that - an island. If you want to see the Big Picture, I can only recommend SPJ's 1987 (except for the optimization section, almost everything is still true) book: http://research.microsoft.com/~simonpj/papers/slpj-book-1987/slpj-book-1987.djvu Stefan signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] GHC 6.7 on Windows / containers-0.1 package?
STG is a very pretty island, but it's just that - an island. If you want to see the Big Picture, I can only recommend SPJ's 1987 (except for the optimization section, almost everything is still true) book: http://research.microsoft.com/~simonpj/papers/slpj-book-1987/slpj-book-1987.djvu Stefan Well, if the sun shines on that island, I wouldn't mind spending a holiday over there ;-) 1987??? Gee, I was still programming in 6502 68000 assembler then :-) Of course, I guess one could not use Haskell back then to make a videogame on home computers with 64KB of RAM ;-) Is this still up-to-date with the way GHC/GHCi work internally? Then I'll certainly check it out. Thanks, Peter ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] GHC 6.7 on Windows / containers-0.1 package?
Hi Peter, So I grabbed ghc-6.7.20070824 (=the latest one for Windows I could find) and the extra-libs, compiled and installed the GLUT package (which I needed), but when I compile my library, I get Could not find module `Data.Map': it is a member of package containers-0.1, which is hidden All dependencies etc. have changed when going to 6.7/6.8 - you are probably better off using 6.6.1 for now. I also don't think that the debugger will help you track down infinite loop style errors. You might be better off posting the code and asking for help. Thanks Neil ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] GHC 6.7 on Windows / containers-0.1 package?
On Wed, Sep 19, 2007 at 10:24:24PM +0100, Neil Mitchell wrote: Hi Peter, So I grabbed ghc-6.7.20070824 (=the latest one for Windows I could find) and the extra-libs, compiled and installed the GLUT package (which I needed), but when I compile my library, I get Could not find module `Data.Map': it is a member of package containers-0.1, which is hidden All dependencies etc. have changed when going to 6.7/6.8 - you are probably better off using 6.6.1 for now. I also don't think that the debugger will help you track down infinite loop style errors. You might be better off posting the code and asking for help. You said 0% CPU. That's *very* important. It means that you are using the threaded runtime (GHCi?), and that you triggered a blackhole. You should be able to handle this by compiling your program with -prof (do *not* use -threaded!), and running with +RTS -xc. With luck, that will give you a backtrace to the infinite loop. PS. blackholes are a serious dark corner of GHC's execution model, chances are better than even that if you try to use the debugger for this you will discover a new and (for you) crippling bug. I wouldn't recommend it. Stefan signature.asc Description: Digital signature ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
