Preston Lee's Blog

Tag: ruby

  • Ruby Supercomputing: Using The GPU For Massive Performance Speedup

    Confreaks just released a Ruby/JRuby GPU presentation of mine from Mountain West Ruby Conference 2011 in Salt Lake City, Utah. Slightly stale, but all still very relevant to HPC today! http://confreaks.tv/videos/mwrc2011-ruby-supercomputing-using-the-gpu-for-massive-performance-speedup

  • Prolog for Ruby (ruby-prolog) Updated, Hits v1.0.1

    After a long period of inactivity I’ve updated the F/OSS ruby-prolog gem! It’s been updated for ruby 2.0.0, bundler, and minitest, and released as v1.0.1! ruby-prolog allows you to solve complex logic problems on the fly using a dynamic, Prolog-like DSL. Basic use is encompassed by stating basic facts using your data, defining rules, and…

  • Capistrano Hanging During .tgz Upload

    I just spent an annoying amount of time troubleshooting a new cap-based deploy.rb for a Rails app to a new CentOS 6.4 server. The deploy.rb worked perfectly on other systems, but something about the configuration was causing `cap deploy’ to hang during the following: servers: [“myapp.example.com”] ** sftp upload /var/folders/0j/vmvt2by53m901wtmfv8xfjw40000gn/T/20130530225953.tar.gz -> /tmp/20130530225953.tar.gz Long story short,…

  • Proxy Authentication Against Devise-Based Ruby Applications

    (Quick GitHub link!) My team at TGen has a Rails application using a typical devise + cancan installation for authentication and authorization, respectively, and a related Apache HTTPD proxy server we needed to authenticate against active accounts in the webapp before passing traffic to their destination, which is a single host. We tried mod_authn_dbd for a…

  • Quick FASTQ File Parsing Via Memory Mapping In C/C++

    I recently had a need to speedily parse through 8GiB+ .fastq text files to calculate a simple statistic of genomic data. My initial “pfastqcount” implementation in Ruby worked fine, but with many files to process took longer than I had hoped in addition to consuming an alarming amount of CPU. I ended up reimplementing the pfastqcount…

  • Introducing RailRoady: The Rails 3 UML Diagram Generator

    I just released the first production version of the RailRoady gem about 5 minutes ago. If you’re a developer on Rail 3, you’ll definitely want to check it out. No more Vizio class diagrams! (RubyFlow announcement.)

  • Spring 2011 ASU Webapp Course

    In Spring 2011, the College of Technology and Innovation at the ASU Polytechnic campus will again be offering CST 533/494: Database-Centric Enterprise Application Development. The calendar is not yet out, but should soon be listed as a Thursday evening class: one night per week for the Spring semester. The course will be available at both undergraduate and…

  • Upgrading From Ruby 1.9.1 to Ruby 1.9.2

    I’ve spent half the day so far inbeded in the furious stressful upgrade process of a handful of Ubuntu Linux 10.04 and Mac OS X Snow Leopard systems from Ruby 1.9.1 to Ruby 1.9.2. I haven’t even gotten to the Rails 3.0.0 stuff yet: just the baseline Ruby installation. I’ve gone through the upgrade process…

  • 3D Desktop Ruby Applications On Linux

    Over the past year I’ve put out a few working demos of how to develop full 3D, OpenGL-based OSX applications using Ruby. Most of the comments I’ve received have been positive, but I think the high learning overhead has been the prime limiting factor in addoption. I also decided to focus exclusively on Mac OS…

  • Ruby: On The Perl Origins Of “&&” And “||” Versus “and” And “or”.

    Overview Avdi Grimm has a recent post noting the use of “and” and “or” Ruby keywords as essentially control flow operators, and hinting on their Perl origins. This instantly recalled several mental notes of old Perl programs, so I though I’d put out a few quick notes on the Perl equivalents for Ruby programmers not…