Re: [Haskell-cafe] my Fasta is slow ;(
I've already submitted it, thanks. The Fortran program commits the same sin as the C++ one, of doing floating point arithmetic in the inner loop; that's why it's slow. On Dec 27, 2012, at 18:05, Branimir Maksimovic bm...@hotmail.com wrote: Thank you. Your entry is great. Faster than fortran entry! Dou you want to contribute at the site, or you want me to do it for you? -- Date: Thu, 27 Dec 2012 15:58:40 -0800 Subject: Re: [Haskell-cafe] my Fasta is slow ;( From: b...@serpentine.com To: bm...@hotmail.com CC: haskell-cafe@haskell.org On Tue, Dec 18, 2012 at 12:42 PM, Branimir Maksimovic bm...@hotmail.comwrote: Seems to me that culprit is in function random as I have tested rest of code and didn't found speed related problems. The problem with your original program was that it was not pure enough. Because you stored your PRNG state in an IORef, you forced the program to allocate and case-inspect boxed Ints in its inner loop. I refactored it slightly to make genRand and genRandom pure, and combined with using the LLVM back end, this doubled the program's performance, so that the Haskell program ran at the same speed as your C++ version. The next bottleneck was that your program was performing floating point arithmetic in the inner loop. I changed it to precompute a small lookup table, followed by only using integer arithmetic in the inner loop (the same technique used by the fastest C fasta program). This further improved performance: the new Haskell code is 40% faster than the C++ program, and only ~20% slower than the C program that currently tops the shootout chart. The Haskell source is a little over half the size of the C source. You can follow the work I did here: https://github.com/bos/shootout-fasta ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
Re: [Haskell-cafe] Makefile for a Haskell Project
Quoting xuan bach pig28...@gmail.com: Hi everyone, I'm a newbie in Haskell. I'm wondering that if there is any tool support creating Makefile for Haskell project like Ocamlbuild for Ocaml project? I'v just started learning how to use Neil Mitchell's Shake described at: http://neilmitchell.blogspot.co.uk/2012/02/shake-better-make.html Its available on hackage. Hth Thank you, Regards. -- *Le Dinh Xuan Bach* *Tel: 01234711869 or +65 86967149 * *Email: pig28...@gmail.com School of Information and Communication, * *Hanoi University of Science and Technology - ?? ?01234711869 or +65 86967149 pig28...@gmail.com * ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] ANN: shelltestrunner 1.3
I'm pleased to announce the release of shelltestrunner 1.3. New in this release: * support latest Diff, cmdargs, test-framework; tested with GHC 7.6.1 (Magnus Therning) * fix unicode handling on GHC = 7.2 shelltestrunner tests command-line programs (or arbitrary shell commands.) It reads simple declarative tests specifying a command, some input, and the expected output, and can run them run in parallel, selectively, with a timeout, in color, and/or with differences highlighted. shelltestrunner has been tested on gnu/linux, mac and windows; projects using it include hledger, berp, cblrepo and eddie. shelltestrunner is free software released under GPLv3+. Home: http://joyful.com/shelltestrunner Install: $ cabal install shelltestrunner ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
[Haskell-cafe] getting upload date from hackage-db?
(Firstly, I apologize if this is not the right mailing list for this question. But haskell-cafe seems to be the place to go when in doubt.) I'm using the hackage-db package (Distribution.Hackage.DB) to analyze Hackage programatically. It parses 00-index.tar and provides a mapping from package name and version to a GenericPackageDescription. I've figured out how to get most of the information I want from the GenericPackageDescription. But one piece of information that's present on the Hackage web pages that I'd like to be able to get is Upload date, but I can't find this information anywhere in the GenericPackageDescription. Am I missing it? It looks like the modification dates of the cabal files inside 00- index.tar correspond to the upload date. Is this correct? If so, I could parse this out of 00-index.tar myself (using the tar package). Is that the best way to do what I'm trying to accomplish, or is there a better, less reinventing the wheel way that I'm missing? Thanks, --Patrick ___ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe
