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

aras-p

// Just before switching jobs:
// Add one of these.
// Preferably into the same commit where you do a large merge.
//
// This started as a tweet with a joke of "C++ pro-tip: #define private public",
// and then it quickly escalated into more and more evil suggestions.
// I've tried to capture interesting suggestions here.
//
// Contributors: @r2d2rigo, @joeldevahl, @msinilo, @_Humus_,
// @YuriyODonnell, @rygorous, @cmuratori, @mike_acton, @grumpygiant,

midascodebreaker

Prerequisite:

• Php7
• Composer
• Gulp
• Npm
• Vagrant
• Virtual Box
• Laravel Installer

nickkraakman

FFmpeg Cheat Sheet for 360º video

Brought to you by Headjack

 
FFmpeg is one of the most powerful tools for video transcoding and manipulation, but it's fairly complex and confusing to use. That's why I decided to create this cheat sheet which shows some of the most often used commands.

 
Let's start with some basics:

• ffmpeg calls the FFmpeg application in the command line window, could also be the full path to the FFmpeg binary or .exe file

henrytriplette

Rename all files inside folder in lowercase. Recursive. - Cmd

for /f "Tokens=*" %f in ('cmd /c "echo %cd%& dir /l/b/ad/s"') do (for /f "Tokens=*" %g in ('dir /l/b/a-d "%f"') do (rename "%f"\"%g" "%g"))

:: Rename all directories to lowecase. Recursive - Cmd

for /F %a in ('dir /L /B') do ren %a %a

Count number of lines inside a file

henrytriplette

Disable screen blanking in X-Windows on Raspbian

xset s off         # don't activate screensaver
xset -dpms         # disable DPMS (Energy Star) features.
xset s noblank     # don't blank the video device

Disk space, memory and cpu

df -h: Shows information about the available disk space.

StevenACoffman

Unicode Character Look-Alikes

Original Letter	Look-Alike(s)
a	а ạ ą ä à á ą
c	с ƈ ċ
d	ԁ ɗ
e	е ẹ ė é è
g	ġ
h	һ

PeterDekkers

#! /usr/bin/python3

"""
Simple macOS script to recursively convert AIFF and WAV files to 44.1kHz 16bit mono PCM.
Ideal for use with Polyend Play.

Only files that are not already in the right format will be converted.

Requires Python 3.