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ハッシュライフはライフゲームないし類似したセル・オートマトンで、繰り返しパターンなどがある場合を効率的に表現したり、全盤面について1世代ずつ計算を繰り返すのではなく、影響範囲をうまく利用することで効率よく未来の状態を計算することが可能な手法である。「ハッシュ」の名の通り、ハッシュテーブルを利用した部分構造の共有が前提[1]だが、さらにメモ化を利用すれば、1世代ごとの計算の繰り返しに比べて、非常に高速に未来の世代を得ることも可能となる。初出は1980年代初期で、その頃ゼロックスパロアルト研究所の研究に参加していたビル・ゴスパーによる[2]。ゴスパーによる実装には、シンボリックスのLISPマシンと、FlavorsというLISPのオブジェクト指向拡張が用いられた。 ハッシュライフ[編集] ハッシュライフはライフゲームのバリエーションの多くで現れる多量の時間的・空間的な冗長性を活用する。例えば、ラ
Welcome to Fabric! Fabric is a high level Python (2.7, 3.4+) library designed to execute shell commands remotely over SSH, yielding useful Python objects in return. It builds on top of Invoke (subprocess command execution and command-line features) and Paramiko (SSH protocol implementation), extending their APIs to complement one another and provide additional functionality. To find out what’s new
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Nodeunit Simple syntax, powerful tools. Nodeunit provides easy async unit testing for node.js and the browser. DEPRECATED PROJECT The project is very stale. We've kept it working on new versions of node, and sometimes merged small PRs that help teams relying on nodeunit. Nodeunit was the arguably first testing framework developed for node. It was very useful at the time, but there's an overwhelmin
-h, --help Print usage information. `--help options` for details on available options. -V, --version Print version number. -p, --parse <options> Specify parser options: `acorn` Use Acorn for parsing. `bare_returns` Allow return outside of functions. Useful when minifying CommonJS modules and Userscripts that may be anonymous function wrapped (IIFE) by the .user.js engine `caller`. `spidermonkey` A
Working (laboring) time is the period of time that a person spends at paid labor. Unpaid labor such as personal housework or caring for children or pets is not considered part of the working week. Many countries regulate the work week by law, such as stipulating minimum daily rest periods, annual holidays, and a maximum number of working hours per week. Working time may vary from person to person,
Amazon are the undisputed kings of the developer plumbing revolution. EC2 and S3 are so ubiquitious to deploying web applications that sometimes it seems difficult to remember when we had to self-host so much of this stuff. But sometimes managing my access keys can be a pain. Or even worse: a security hazard. On one hand, I don’t want to create a new account with different billing information for
User-Mode Linux is a safe, secure way of running Linux versions and Linux processes. Run buggy software, experiment with new Linux kernels or distributions, and poke around in the internals of Linux, all without risking your main Linux setup. User-Mode Linux gives you a virtual machine that may have more hardware and software virtual resources than your actual, physical computer. Disk storage for
EngineeringUnicorn!We've been running Unicorn for more than a month. Time to talk about it. What is it? Unicorn is an HTTP server for Ruby, similar to Mongrel or Thin. It… We’ve been running Unicorn for more than a month. Time to talk about it. What is it? Unicorn is an HTTP server for Ruby, similar to Mongrel or Thin. It uses Mongrel’s Ragel HTTP parser but has a dramatically different architectu
NodeJS has been garnering a lot of attention late. Briefly, NodeJS is a server-side JavaScript runtime implemented using Google's highly performant V8 engine. It provides an (almost) completely non-blocking I/O stack which, when combined with JavaScript closures and anonymous functions, makes it an excellent platform for implementing high throughput web services. As an example, a simple "Hello, wo
This respository is not under active development Check out Rick Olson’s coffee-resque which is. Resque for Node.js Resque is a redis backed task queue inspired by delayed job. Node.js is a javascript runtime built on the v8 engine. Why? Resque.js allows you to chunk together blocks of concurrent code and work through them serially across multiple worker processes & machines. The advantage of build
The first basic thesis of node.js is that I/O is expensive: So the largest waste with current programming technologies comes from waiting for I/O to complete. There are several ways in which one can deal with the performance impact (from Sam Rushing): synchronous: you handle one request at a time, each in turn. pros: simple cons: any one request can hold up all the other requests fork a new proc
Ideas about maps, technology, & usability. by Justin O'Beirne Google Maps & Its City Labels A few months ago, I was contacted by someone familiar with how Google Maps is made. The person had taken issue with my post “Where’s New York City?” and had sought to defend Google Maps’s “city labeling process”. According to the person, Google uses a series of “sophisticated labeling algorithms” that give
Open source databases Learn how to set up Percona's open source solutions for your database needs. Pick your favorite technology to access our step-by-step guidance and documentation. Cloud-native databases Leverage the power of modern open source databases on the cloud with Percona solutions for PostgreSQL, MongoDB, and MySQL. Click to start your cloud-native databases journey with our documentat
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