Get it from RubyForge (http://rubyforge.org/frs/?group_id=126) and run (as root, if appropriate and necessary) ruby setup.rb Itâs easy. It installs the required library files and the gem command. This command gives us the power to do everything else in this document, except distribute gems (for now!). Debian Linux: Debian does not automatically include all the standard Ruby libararies in the basic
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8. Macros: Defining Your OwnNow it's time to start writing your own macros. The standard macros I covered in the previous chapter hint at some of the things you can do with macros, but that's just the beginning. Common Lisp doesn't support macros so every Lisp programmer can create their own variants of standard control constructs any more than C supports functions so every C programmer can write
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Is immutatble data always slower than mutable state? I was challenged in a discussion over at Reddit about this issue, and I decided to perform a little experiment to back up a rough estimate with some numbers. I was surprised and delighted to see that I could make my case very strong indeed by showing that no, immutable data can be twice as fast as mutable data in a modern functional language. I
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By Ilya Grigorik on April 20, 2009 Lift the curtain behind any modern web application and you will find at least a few proxy servers orchestrating the show. Caching proxies such as Varnish and Squid help us take the load of our application servers; reverse proxies such as Haproxy and Nginx help us partition and distribute the workload to multiple workers, all without revealing the underlying archi
By Ilya Grigorik on July 22, 2008 It's unit tested, the integration and regressions tests are all green, you even added a set of performance benchmarks, and yet after a couple of hours of production use the process is falling over - we've all been there before. Good instrumentation in these situations is worth its weight in gold. If you're lucky, you may be able to use DTrace, if you're adventurou
By Ilya Grigorik on October 27, 2008 Late last week Rails core team announced the release of Rails 2.2RC1, which amongst other things slips in 'thread safety' and an implementation of a connection pool for our beloved ActiveRecord. Pratik Naik and Charles Nutter have both covered the implications of these contributions, but the executive summary is as follows: single ruby process (mongrel), plus m
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By Ilya Grigorik on November 13, 2008 Update: post has been renamed to "Parallelism is a Myth in Ruby"... Why? Because concurrency is not parallelism - highly recommend this talk by Rob Pike. Concurrency is the composition of independently executing things (which is possible in Ruby), and parallelism is the simultaneous execution of multiple things (which is not possible in MRI, see below). One is
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unit-1.32.0 version has been released, featuring the WebAssembly Component Model and Unit variables access from njs.
By Ilya Grigorik on February 11, 2008 If web architectures, performance, or scalability are topics you would like to keep on top of (who doesn't!), then chances are, you've heard of Nginx ("engine x"). Originally developed by Igor Sysoev for rambler.ru (second largest Russian web-site), it is a high-performance HTTP server / reverse proxy known for its stability, performance, and ease of use. The
By Ilya Grigorik on December 28, 2007 Amazon's recent announcement of SimpleDB generated a lot of buzz in the community - finally, a database service for our virtual infrastructure! Well, not so fast. SimpleDB is a far cry from the usual RDMBS we're all used to, and it's best described as a key-value store (BerkeleyDB, really), or a meta-data storage layer for your S3 objects. If you're curious, C
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Guest Post by Joel Reyes Web designers always have to strike a balance between usability and visual appeal when designing a website. Without this balance, a website might be nice to look at or difficult to navigate. Or, it might be easy to navigate, but not easy on the eyes. With this in mind, balancing attractive navigation with usability does not need to be overly difficult. To help you generate
By Ilya Grigorik on February 13, 2009 It took Ruby some time to go from an infant research project by Matz to a language we've all come to know so well. Now, another Japanese developer (Mikio Hirabayashi) has all the potential to repeat this cycle with his new database project: Tokyo Cabinet. Developed and sponsored by Mixi Inc. (Japanese Facebook), it is an incredibly fast, and feature rich datab
Baseball âI wrote 63 songs this year. Theyâre all about Jeter.â Just kidding. The game we love, the players we hate, and more. Culture and Criticism From Norman Mailer to Wendy Pepper â everything on film, TV, books, music, and snacks (shut up, raisins), plus the Girlsâ Bike Club. Donors Choose and Contests Helping public schools, winning prizes, sending a crazy lady in a tomato costume out in pub
8. Compound statements¶ Compound statements contain (groups of) other statements; they affect or control the execution of those other statements in some way. In general, compound statements span multiple lines, although in simple incarnations a whole compound statement may be contained in one line. The if, while and for statements implement traditional control flow constructs. try specifies except
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The duo is not Cisco and Poncho or the Lone Ranger and Silver. Paxos is closer to leather biker gear and a Harley Davidson belt buckle. The outfit gets some panache and the bikerâs pants stay properly slung. You may want to read the 16 pages of Googley goodness here. The paper is âPaxos Made LiveâAn Engineering Perspective.â One of the interesting facts about this paper is that Tushar Chandra has
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