Re: [Haskell-cafe] Is Haskell a Good Choice for Web Applications? (ANN: Vocabulink)
I've heard it's hard to contain a long-running Haskell application in a finite amount of memory, but this is probably not a problem if your web site sleeps 0.001% of the time (like XMonad), or you can restart it every once in a while without anyone noticing. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Is Haskell a Good Choice for Web Applications? (ANN: Vocabulink)
On Wed, May 6, 2009 at 8:20 PM, Anton van Straaten an...@appsolutions.com wrote: The app is written for a client under NDA, so a blog about it would have to be annoyingly vague. No doubt the potential for encountering space leaks goes up as one writes less pure code, persist more things in memory, and depend on more libraries. Exactly. I'm worried about, e.g. needing to use something as simple as a stream of prime numbers (see the recent thread about leaks there) My main point in mentioning my app is that long-running isn't really the issue - that's just a way of saying that an app has space leaks that are small enough not to be noticed until it's stressed. An internal web site with few benign users is one thing, but if it's an external web site, it might get stressed in ways different from your expected usage scenarios, if you know what I mean. To put this back into context, I was objecting to your having extended the space leak worrying to all GC'd languages. I agree. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Questions about slow GC with STArray
I've been following with interest the recent discussions on reddit about the extremely slow hash tables in Haskell compared to F# and OCaml, and as I understood it, this performance problem is caused by GC not liking mutable arrays http://hackage.haskell.org/trac/ghc/ticket/650 It appears from the discussion there that this is more than a simple bug, but a fundamental difficulty (slow writes vs slow GC trade-off). What I'm wondering though is how can this be unique to GHC: all arrays in OCaml and probably F# are mutable (and usually unboxed). How is this problem addressed there? Why is this supposed to be specific to boxed arrays only: wouldn't GC have to scan the whole mutable array whether it's boxed or unboxed? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Questions about slow GC with STArray
On Mon, Apr 6, 2009 at 1:10 AM, Bulat Ziganshin bulat.zigans...@gmail.com wrote: you need to scan only boxes: if array just contains plain cpu-level numbers, there is nothing to scan Are those the only legal contents of STUArray? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: Re[2]: [Haskell-cafe] Questions about slow GC with STArray
On Mon, Apr 6, 2009 at 1:49 AM, Bulat Ziganshin bulat.zigans...@gmail.com wrote: Are those the only legal contents of STUArray? numbers, chars, vanilla pointers. UArray just mimics C arrays, after all I haven't gotten to learning about them in detail yet, but my hope was that STUArray was like vectorT in C++, and STArray was like vectorT*. Both are fairly general. So if I need a array of complex numbers in Haskell, will I need an extra level of indirection compared to C? And in addition to that some serious issues with GC speed if those arrays need to be mutable? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] automatically inserting type declarations
I remember hearing about a Haskell mode for Vim, Emacs, Yi or VisualHaskell that inserts type declarations automatically (it's lazier to just check the type than to write it manually), but I can't remember any details. What editor mode / IDE was it? What do most people use with GHC on Linux? I'm more used to Vim than to Emacs. Yi sounds like something I might like. Is it stable enough to solve more problems than it would create? (I hate buggy and broken stuff) ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] high probability of installation problems and quality of the glorious implementation
I'm still learning Haskell and also evaluating whether I want to use the language in my work. It seems like a fascinating language so far (although I don't know if laziness will be a detriment later for me eventually), but I'm a bit worried about the overall quality of its GHC implementation. For example, I tried installing GHC-6.10.2 on my Ubuntu 8.04 machine (probably the most mainstream Linux these days). 1st attempt: binary = failed the impossible happened, report bug (I think it's already in bugzilla for an even earlier version) 2nd attempt: source and docs = followed README, but make failed while building docs 3rd attempt: source only, no docs = make install succeeded, but ghci now seems to have its readline screwed up (no editing, can't quit even with Ctrl-C or Ctrl-D), while Ubuntu-bundled 6.8.* ghci works fine in this regard. If these kinds of issues are common only during installation, I can live with that, but if GHC is flaky overall, having to deal with this may cancel out whatever productivity advantages Haskell provides. If the quality of the installation procedures is different from the compiler itself, can you explain why? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] high probability of installation problems and quality of the glorious implementation
On Sun, Apr 5, 2009 at 12:35 PM, John Dorsey hask...@colquitt.org wrote: Once it's installed and working, GHC's a very decent compiler. My general null hypothesis is, as Alec Baldwin put it, that a loser is a loser, or a buggy project is buggy. If GHC is robust overall (which I'm yet to find out), why is the installation so broken? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] high probability of installation problems and quality of the glorious implementation
On Sun, Apr 5, 2009 at 1:41 PM, Peter Verswyvelen bugf...@gmail.com wrote: That is strange, I'm using Ubuntu myself, and I come from Windows so know absolutely nothing about Linux whatsoever, but GHC 6.10.2 binary installed without problems. Are you running 32-bit Ubuntu 8.04 ? /etc/lsb-release and /etc/issue* may contain this info, also $ uname -a It may also be the presence or absence of some packages that the installation requires, but ./configure doesn't check. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] The votes are in!
I demand a recount! The one that launches the missile should have won! 2009/3/24 Eelco Lempsink ee...@lempsink.nl: The results of the Haskell logo competition are in! You can view them at http://www.cs.cornell.edu/w8/~andru/cgi-perl/civs/results.pl?num_winners=1id=E_d21b0256a4fd5ed7algorithm=beatpath Congratulations Jeff Wheeler! I'll set up a page with the results visibile. -- Regards, Eelco Lempsink ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Haskell Logo Voting has started!
If avoiding success at all costs is the goal, wouldn't having a cool logo be counter-productive? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] big discussion about Haskell on Reddit
I noticed that on Programming Reddit, where I lurk, there is a big discussion about the disconnect between how much Haskell is advocated there and the number of applications written in it. http://www.reddit.com/r/programming/comments/84sqt/dear_reddit_i_am_seeing_12_articles_in/ The difficulty of reasoning about memory and CPU-efficiency in nontrivial programs was suggested as an explanation. ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Re: MPI
On Fri, Mar 6, 2009 at 9:30 AM, Don Stewart d...@galois.com wrote: http://haskell.org/haskellwiki/Applications_and_libraries/Concurrency_and_parallelism#Distributed_Haskell These are all Haskell-derived languages, not libraries, right? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] Re: MPI
On Wed, Mar 4, 2009 at 5:03 PM, FFT fft1...@gmail.com wrote: Are MPI bindings still the best way of using Haskell on Beowulf clusters? It's my feeling that the bindings stagnated, or are they just very mature? What's the story with distributed memory multiprocessing? Are Haskell programmers uninterested in it, or are things other than MPI used with it? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] binary serialization
Is there a way to do binary serialization of Haskell values (in GHC, at least)? If you propose a method, what are its type safety and portability properties? ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
