hgmnz

Types of index scans

Indexes

Sequential Scan:

• Read every row in the table
• No reading of index. Reading from indexes is also expensive.

jed

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE
                    Version 2, December 2004

 Copyright (C) 2011 Jed Schmidt <http://jed.is>

 Everyone is permitted to copy and distribute verbatim or modified
 copies of this license document, and changing it is allowed as long
 as the name is changed.

            DO WHAT THE FUCK YOU WANT TO PUBLIC LICENSE

hellerbarde

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

piscisaureus

Locate the section for your github remote in the .git/config file. It looks like this:

[remote "origin"]
	fetch = +refs/heads/*:refs/remotes/origin/*
	url = [email protected]:joyent/node.git

Now add the line fetch = +refs/pull/*/head:refs/remotes/origin/pr/* to this section. Obviously, change the github url to match your project's URL. It ends up looking like this:

cpq

// Copyright (c) Sergey Lyubka, 2013.
// All rights reserved.
// Released under the MIT license.

// This program is used to embed arbitrary data into a C binary. It takes
// a list of files as an input, and produces a .c data file that contains
// contents of all these files as collection of char arrays.
// Usage:
//   1. Compile this file:
//      cc -o embed embed.c

suweller

Whitespace fish - 🐟

The ultimate humiliation. Given for not adhering to whitespace guidelines.

Emoji cop - 👮

For using the wrong Emoij

gblazex

function fixDevTools() {

	Element.prototype.enableStyleClass = function(){}

	var oldToggle = DOMTokenList.prototype.toggle;
	DOMTokenList.prototype.toggle = function(c) {
	 if ('offscreen' == c) return;
	 oldToggle.apply(this, arguments);
	}

csfrancis

# Updated for Ruby 2.3
string_t = None

def get_rstring(addr):
  s = addr.cast(string_t.pointer())
  if s['basic']['flags'] & (1 << 13):
    return s['as']['heap']['ptr'].string()
  else:
    return s['as']['ary'].string()

pewniak747

class APIResponder < ActionController::Responder

  private

  def display(resource, options = {})
    super(resource.data, options)
  end

  def has_errors?
    !resource.success?

gwillem

# Add this snippet to the top of your playbook. 
# It will install python2 if missing (but checks first so no expensive repeated apt updates)
# [email protected]

- hosts: all
  gather_facts: False
  
  tasks:
  - name: install python 2
    raw: test -e /usr/bin/python || (apt -y update && apt install -y python-minimal)