jboner

Latency Comparison Numbers (~2012)
----------------------------------
L1 cache reference                           0.5 ns
Branch mispredict                            5   ns
L2 cache reference                           7   ns                      14x L1 cache
Mutex lock/unlock                           25   ns
Main memory reference                      100   ns                      20x L2 cache, 200x L1 cache
Compress 1K bytes with Zippy             3,000   ns        3 us
Send 1K bytes over 1 Gbps network       10,000   ns       10 us
Read 4K randomly from SSD*             150,000   ns      150 us          ~1GB/sec SSD

ziadoz

<?php
/*
 * /path/to/migrations/directory/Version20121011141021.php
 */
namespace ExampleMigrations;

use Doctrine\DBAL\Migrations\AbstractMigration;
use Doctrine\DBAL\Schema\Schema;

class Version20121011141021 extends AbstractMigration

satooshi

sf2-ddd
├── app
├── bin
├── build
├── lib
├── src
│   └── __VendorPrefix
│       ├── Application
│       │   └── __DomainNameBundle
│       │       ├── Command

hail2u

" Cycle metasyntactic variables
function! s:CycleMetasyntacticVariables(num)
  if type(a:num) != type(0)
    return
  endif

  let vars = ['foo', 'bar', 'baz', 'qux', 'quux', 'corge', 'grault', 'garply', 'waldo', 'fred', 'plugh', 'xyzzy', 'thud']
  let cvar = expand('<cword>')
  let i = index(vars, cvar)

rrosiek

#! /usr/bin/env bash

###
#
# install_mysql.sh
#
# This script assumes your Vagrantfile has been configured to map the root of
# your application to /vagrant and that your web root is the "public" folder
# (Laravel standard).  Standard and error output is sent to
# /vagrant/vm_build.log during provisioning.

demisx

Provider	Singleton	Instantiable	Configurable
Constant	Yes	No	No
Value	Yes	No	No
Service	Yes	No	No
Factory	Yes	Yes	No
Decorator	Yes	No?	No
Provider	Yes	Yes	Yes

Constant

rondy

FWIW: I (@rondy) am not the creator of the content shared here, which is an excerpt from Edmond Lau's book. I simply copied and pasted it from another location and saved it as a personal note, before it gained popularity on news.ycombinator.com. Unfortunately, I cannot recall the exact origin of the original source, nor was I able to find the author's name, so I am can't provide the appropriate credits.

---

Effective Engineer - Notes

• By Edmond Lau
• Highly Recommended 👍
• http://www.theeffectiveengineer.com/

What's an Effective Engineer?