Slabs, Pages, Chunks and Memcached
2009-06-22 Many people don’t know this but the latest memcached release (1.2.8 right now) can be about 15% more efficient in its memory usage than older releases. If you have a 600MB memcached server, upgrading will magically “gain” you 100MB of RAM. Why is this? When you ask memcached to store a value, it looks up the “slab” associated with that value. A slab holds values within a particular size
Clojure vs Ruby, Part I
2008-12-13 I’m a performance guy, I’ll admit it. I love performance tuning and comparing code to see why one thing is slower than another. I’ve recently taken a shine to the Clojure programming language as it seems to combine two good things: an incredibly fast and reliable VM and a functional language designed for concurrency. Here’s my first performance test: the ever-reliable fibonacci method.
Scalable Ruby Processing with EventMachine
2010-01-27 eventmachine Ruby I gave a talk at Austin On Rails last night on using EventMachine, focused on maximizing concurrency when processing a message queue. There were a lot of questions, mostly revolving around the flow of execution within EventMachine code. To this point, there were two common stumbling points people seemed to have: Ruby developers are not used to treating blocks as true c
Changelog vs Commitlog
2010-02-18 One of the things I really like about some software projects is when they provide an actual changelog or release notes. RabbitMQ released 1.7.2 the other day and I asked the developers if they could link to a changelog. They pointed me to this page. Unfortunately this is not exactly what I had in mind. To me, a changelog is a brief overview of the changes in a version that is digestible
Varnish on 32-bit systems
2010-01-18 We run three small EC2 instances for content caching purposes at OneSpot. These systems are 32-bit machines with 1.7GB of RAM. Originally we figured even on a small system Varnish could flood a 100Mb line so we wouldn’t need a more expensive, large EC2 instance. This blog post explains why this turned out to be a poor choice. Executive summary: Varnish really, really wants to run on a 6
Cassandra Internals -- Reading
Cassandra Internals – Reading 2010-03-17 cassandra In my previous post, I discussed how writes happen in Cassandra and why they are so fast. Now we’ll look at reads and learn why they are slow. Reading and Consistency One of the fundamental thereoms in distributed systems is Brewer’s CAP theorem: distributed systems can have Consistency, Availability and Partition-tolerance properties but can only
Cassandra Internals -- Tricks!
Cassandra Internals – Tricks! 2010-03-20 cassandra In my previous posts, I covered how Cassandra reads and writes data. In this post, I want to explain some of the trickery that Cassandra uses to provide a scalable distributed system. Gossip Cassandra is a cluster of individual nodes – there’s no “master” node or single point of failure – so each node must actively verify the state of the other cl
Introducing Phat, an Asynchronous Rails app
2010-04-03 eventmachine Phat is my new Rails 2.3.5 application which runs 100% asynchronous, supporting many concurrent requests in a single Ruby process. This is a new breed of Rails application which uses a new mode of execution available in Ruby 1.9: single Thread, multiple Fiber. Existing modes of execution suck: Single thread harkens back to the days of Rails 1.x, where you started N mongrels
Unable to execute `rails` in WSL(Windows Subsystem for Linux) · Issue #26054 · rails/rails
Steps to reproduce In WSL in Win 10, after everything basic was setup, I installed rvm and through that I installed ruby-2.3.1 successfully. I created a gemset, and installed rails-5.0 in that gemset. After that I created a demo by rails new rails5_demo , and bundle install successfully. In rails5_demo dir, I run rails s. Expected behavior In the above condition, Rack server should been up and run
Fix `change_column` to drop default with `null: false` by kamipo · Pull Request #26582 · rails/rails
Akira Matsuda on Twitter: "みんなそんなに回線ごときで大家さまにゴチャゴチャ文句言うぐらいなら家ぐらい買えばいいのに。"
みんなそんなに回線ごときで大家さまにゴチャゴチャ文句言うぐらいなら家ぐらい買えばいいのに。
定数の自動読み込みと再読み込み | Rails ガイド
通常のRubyプログラムでは、使いたいクラスやモジュールを定義したファイルを明示的に読み込みます。たとえば、以下のコントローラではApplicationControllerクラスやPostクラスを参照しており、通常はこれらに対してrequire呼び出しを行います。 # Railsではこのように書かないこと require "application_controller" require "post" # Railsではこのように書かないこと class PostsController < ApplicationController def index @posts = Post.all end end Railsは、必要に応じてクラスやモジュールを開発者の代わりに自動読み込み（autoload）します。これが可能になるのは、RailsがセットアップするいくつかのZeitwerkローダーのお
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ITトレメ Rails 3 技術者認定ブロンズ試験 － ＠IT自分戦略研究所
Upcase : Vim for Rails Developers | Online Tutorial by thoughtbot
ITトレメ Rails 3 技術者認定ブロンズ試験 － ＠IT自分戦略研究所
rubocopが一切使われていないRailsアプリにrubocopを段階的に導入していく際にやったこと/やりたいこと - Qiita
ITトレメ Rails 3 技術者認定ブロンズ試験 － ＠IT自分戦略研究所
ITトレメ Rails 3 技術者認定ブロンズ試験 － ＠IT自分戦略研究所
Live streaming threads not dying · Issue #10989 · rails/rails
Akira Matsuda on Twitter: "【業務連絡】 Rubyコミッターの皆さまは、朝イチに出番があります！黄色のコミッターTシャツをご着用の上、9:20までに、いや、できれば9:10ぐらいまでには会場メインホールまでお集まりください！ #rubykaigi"