Shon M ShonM

Resque durability

Resque (https://github.com/defunkt/resque) is nice, but doesn't provide durability. When a worker "reserves" a job, it actually just pops it from the data store, which deletes the job. If anything happens to the worker after it pops the job, the job is lost forever. However, the author of Resque, defunkt, doesn't want reservation or retries added, and has rejected such patches in the past. Therefore, this may not be worth doing with Resque unless someone wants to maintain a fork of it forever.

Background

https://github.com/defunkt/resque/issues/16 -- where defunkt writes "Resque is explicitly designed to never re-try jobs. Ever, under any circumstance." and "If you need jobs to never fail and never slip through the cracks due to failure you may want [something else]".
https://github.com/defunkt/resque/issues/93 -- where defunkt write "Resque

Programming Achievements: How to Level Up as a Developer

This gist is part of a blog post. Check it out at:

http://jasonrudolph.com/blog/2011/08/09/programming-achievements-how-to-level-up-as-a-developer

Welcome!

UPDATE: This list is no longer maintained. I've moved it to its own repo so you can send suggestions as Pull Requests. https://github.com/dideler/bootstrapping/

For feedback or suggestions, please send a tweet (@dideler). Gist comments don't notify me. Pull requests aren't possible with gists (yet), so I don't recommend forking because then I can't easily get the change.

Starring this gist will give me an idea of how many people consider this list useful.

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns
L2 cache reference ........................... 7 ns
Mutex lock/unlock ........................... 25 ns
Main memory reference ...................... 100 ns             
Compress 1K bytes with Zippy ............. 3,000 ns  =   3 µs
Send 2K bytes over 1 Gbps network ....... 20,000 ns  =  20 µs
SSD random read ........................ 150,000 ns  = 150 µs

Read 1 MB sequentially from memory ..... 250,000 ns = 250 µs

	<?php
	namespace satellite;

	class Request {

	public $method;

	public $url;

	public $headers;

	#!/usr/bin/env bash

	##
	# @author Jay Taylor <[email protected]>
	#
	# @date 2011-10-20
	#
	# @description Copies MySQL database to ramdisk then runs supplied shell script
	# or command. The ramdisk version of the database is then copied back to the
	# filesystem. Speeds up IO-intensive operations (e.g. loading heavily indexed

	<?php

	require_once dirname(__DIR__).'/../../../../app/AppKernel.php';

	/**
	* Test case class helpful with Entity tests requiring the database interaction.
	* For regular entity tests it's better to extend standard \PHPUnit_Framework_TestCase instead.
	*/
	abstract class KernelAwareTest extends \PHPUnit_Framework_TestCase
	{

	<?php

	/*
	* This file is part of the Symfony package.
	*
	* (c) Fabien Potencier <[email protected]>
	*
	* For the full copyright and license information, please view the LICENSE
	* file that was distributed with this source code.
	*/

	#!/bin/bash
	# Script for placing sudoers.d files with syntax-checking

	# Making a temporary file to contain the sudoers-changes to be pre-checked
	TMP=$(mktemp -t vagrant_sudoers)
	cat /etc/sudoers > $TMP
	cat >> $TMP <<EOF

	# Allow passwordless startup of Vagrant when using NFS.
	Cmnd_Alias VAGRANT_EXPORTS_ADD = /usr/bin/su root -c echo '*' >> /etc/exports

	#!/bin/bash

	MIN_LAG=25
	MAX_LAG=50
	(( LAG_RANGE = MAX_LAG - MIN_LAG ))

	TIME=600 # total test time (in seconds)
	INTERVAL=0.1 # time in between changes in latency (in seconds)
	STEPS=6000 # TIME / INTERVAL