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@hellerbarde
hellerbarde / latency.markdown
Created May 31, 2012 13:16 — forked from jboner/latency.txt
Latency numbers every programmer should know

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

@dergachev
dergachev / GIF-Screencast-OSX.md
Last active May 2, 2024 05:55
OS X Screencast to animated GIF

OS X Screencast to animated GIF

This gist shows how to create a GIF screencast using only free OS X tools: QuickTime, ffmpeg, and gifsicle.

Screencapture GIF

Instructions

To capture the video (filesize: 19MB), using the free "QuickTime Player" application:

@brandonb927
brandonb927 / osx-for-hackers.sh
Last active May 2, 2024 03:13
OSX for Hackers: Yosemite/El Capitan Edition. This script tries not to be *too* opinionated and any major changes to your system require a prompt. You've been warned.
#!/bin/sh
###
# SOME COMMANDS WILL NOT WORK ON macOS (Sierra or newer)
# For Sierra or newer, see https://github.com/mathiasbynens/dotfiles/blob/master/.macos
###
# Alot of these configs have been taken from the various places
# on the web, most from here
# https://github.com/mathiasbynens/dotfiles/blob/5b3c8418ed42d93af2e647dc9d122f25cc034871/.osx
@MohamedAlaa
MohamedAlaa / tmux-cheatsheet.markdown
Last active May 1, 2024 03:34
tmux shortcuts & cheatsheet

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname
@slowkow
slowkow / needleman-wunsch.py
Last active April 29, 2024 06:05
A simple version of the Needleman-Wunsch algorithm in Python.
#!/usr/bin/env python
"""
The Needleman-Wunsch Algorithm
==============================
This is a dynamic programming algorithm for finding the optimal alignment of
two strings.
Example
-------
@azam
azam / svg2ico.sh
Last active April 28, 2024 03:28
Convert SVG to ICO using ImageMagick, with transparent background and multi-size icons
convert -density 256x256 -background transparent favicon.svg -define icon:auto-resize -colors 256 favicon.ico
@nicksantamaria
nicksantamaria / fork-example.php
Created October 20, 2016 22:35
Example: Parallel processing in PHP using pcntl_fork()
<?php
/**
* @file
* Basic demonstration of how to do parallel threads in PHP.
*/
// This array of "tasks" could be anything. For demonstration purposes
// these are just strings, but they could be a callback, class or
// include file (hell, even code-as-a-string to pass to eval()).
@ryin
ryin / tmux_local_install.sh
Last active April 23, 2024 01:06
bash script for installing tmux without root access
#!/bin/bash
# Script for installing tmux on systems where you don't have root access.
# tmux will be installed in $HOME/local/bin.
# It's assumed that wget and a C/C++ compiler are installed.
# exit on error
set -e
TMUX_VERSION=1.8
@johan
johan / README.md
Last active April 12, 2024 11:14
A micro-library (4k minified) for DRY:ing up the boring boilerplate of user scripts.

The fun part of user scripting is deciding what happens. The boring part is scavenging the DOM for bits of templated data, or elements you want to mod.

Have on.js do it for you!

@andrewh
andrewh / anyconnect.scpt
Last active April 12, 2024 08:48
Applescript to automate the Cisco AnyConnect SSL VPN client on OS X Mavericks
-- 1. Place in ~/Library/Scripts and enable the Applescript menu via the Applescript Editor
-- 2. Substitute "vpn.example.com" and "redacted" for your VPN server and password
-- 3. Open Security & Privacy System Preferences, go to Privacy, Accessibility
-- 4. Enable Applescript Editor and System UI Server
-- 5. Trigger script from the menu
-- 6. Enjoy being connected
tell application "Cisco AnyConnect Secure Mobility Client"
activate
end tell