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

mjnaderi

Installing Arch Linux with Full Disk Encryption

If you're aiming for a seamless Arch Linux installation in UEFI mode, follow along as this guide will walk you through the process step by step. We'll be using LUKS (Linux Unified Key Setup) and LVM (Logical Volume Manager) partitions on LUKS to achieve full disk encryption.

Note: I have updated this doc for UEFI mode. For those with BIOS/MBR systems, you can refer to the previous version, but keep in mind that it might be outdated and no longer accurate.

If you're only interested in installing Linux and not setting up dual boot with Windows, feel free to skip the Windows-related sections.

elasticdog

#!/usr/bin/env bash

# ensure we were given two command line arguments
if [[ $# -ne 2 ]]; then
	echo 'usage: vault-cp SOURCE DEST' >&2
	exit 1
fi

source=$1
dest=$2

iros

Title

<Additional information about your API call. Try to use verbs that match both request type (fetching vs modifying) and plurality (one vs multiple).>

• URL

  <The URL Structure (path only, no root url)>

• Method:

chrismdp

# You don't need Fog in Ruby or some other library to upload to S3 -- shell works perfectly fine
# This is how I upload my new Sol Trader builds (http://soltrader.net)
# Based on a modified script from here: http://tmont.com/blargh/2014/1/uploading-to-s3-in-bash

S3KEY="my aws key"
S3SECRET="my aws secret" # pass these in

function putS3
{
  path=$1

mmalone

# In-memory Cassandra-ish thingy... useful for unit tests. Maybe useful for other
# stuff too? No support for SuperColumns, but that should be easy enough to add.


import bisect
import copy
from cassandra.ttypes import NotFoundException, Column, ColumnPath, ColumnOrSuperColumn


class SSTable(object):

barkerja

var options, req, request;

request = require('request');

options = {
  uri: 'https://p04-fmfmobile.icloud.com/fmipservice/friends/{account_id}/{unique_device_id}/minCallback/selFriend/refreshClient',
  method: 'POST',
  headers: {
    'X-Apple-AuthScheme': 'Forever',
    'Content-type': 'application/json'

mwunsch

/**
 *
 * Here's a thing that will look through all the text nodes of a document, and
 * upon encountering an emoji codepoint, will replace it with an image.
 * For now, those images are pulled from GitHub, which isn't very nice, so I
 * need to find a more suitable host.
 *
 * Much of this code was gleaned from staring at the minified GitHub JS.
 *
 * Copyright (c) 2013 Mark Wunsch. Licensed under the MIT License.

Protonk

// Linear Congruential Generator
// Variant of a Lehman Generator 
var lcg = (function() {
  // Set to values from http://en.wikipedia.org/wiki/Numerical_Recipes
      // m is basically chosen to be large (as it is the max period)
      // and for its relationships to a and c
  var m = 4294967296,
      // a - 1 should be divisible by m's prime factors
      a = 1664525,
      // c and m should be co-prime

rsms

// HTTP client for testing high connection concurrency
// Authors: Richard Jones and Rasmus Andersson
// Released in the public domain. No restrictions, no support.
#include <sys/types.h>
#include <sys/time.h>
#include <sys/queue.h>
#include <stdlib.h>
#include <err.h>
#include <event.h>
#include <evhttp.h>