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

jlong

var parser = document.createElement('a');
parser.href = "http://example.com:3000/pathname/?search=test#hash";

parser.protocol; // => "http:"
parser.hostname; // => "example.com"
parser.port;     // => "3000"
parser.pathname; // => "/pathname/"
parser.search;   // => "?search=test"
parser.hash;     // => "#hash"
parser.host;     // => "example.com:3000"

scy

Opening and closing an SSH tunnel in a shell script the smart way

I recently had the following problem:

• From an unattended shell script (called by Jenkins), run a command-line tool that accesses the MySQL database on another host.
• That tool doesn't know that the database is on another host, plus the MySQL port on that host is firewalled and not accessible from other machines.

We didn't want to open the MySQL port to the network, but it's possible to SSH from the Jenkins machine to the MySQL machine. So, basically you would do something like

ssh -L 3306:localhost:3306 remotehost

sinclairtarget

#include <stdio.h>

/*
 * Calculates what Ada Lovelace labeled "B7", which today we would call the 8th
 * Bernoulli number.
 */
int main(int argc, char* argv[])
{
    // ------------------------------------------------------------------------
    // Data

while0pass

" hide hidden chars
:set nolist

" show hidden characters in Vim
:set list

" settings for hidden chars
" what particular chars they are displayed with
:set lcs=tab:▒░,trail:▓,nbsp:░
" or

grugq

Operational PGP

This is a guide on how to email securely.

There are many guides on how to install and use PGP to encrypt email. This is not one of them. This is a guide on secure communication using email with PGP encryption. If you are not familiar with PGP, please read another guide first. If you are comfortable using PGP to encrypt and decrypt emails, this guide will raise your security to the next level.

reidransom

Configure Zeroconf on FreeBSD

Install avahi-app and nss_mdns. Note: avahi-app is chosen over avahi because avahi depends on X11.

$ cd /usr/ports/net/avahi-app
$ sudo make config-recursive
$ sudo make install clean
$ cd /usr/ports/dns/nss_mdns
$ sudo make config-recursive

$ sudo make install clean

postmodern

NAME=project
VERSION=0.0.1

DIRS=etc lib bin sbin share
INSTALL_DIRS=`find $(DIRS) -type d 2>/dev/null`
INSTALL_FILES=`find $(DIRS) -type f 2>/dev/null`
DOC_FILES=*.md *.txt

PKG_DIR=pkg
PKG_NAME=$(NAME)-$(VERSION)

tvlooy

#!/bin/bash

function test {
    MESSAGE=$1
    RECEIVED=$2
    EXPECTED=$3

    if [ "$RECEIVED" = "$EXPECTED" ]; then
        echo -e "\033[32m✔︎ Tested $MESSAGE"
    else

Daniel-Hug

var arr = {	
	max: function(array) {
		return Math.max.apply(null, array);
	},
	
	min: function(array) {
		return Math.min.apply(null, array);
	},
	
	range: function(array) {