Bumsoo Kim bskim45

Running redis using upstart on Ubuntu

I've been trying to understand how to setup systems from the ground up on Ubuntu. I just installed redis onto the box and here's how I did it and some things to look out for.

To install:

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

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

	#!/usr/bin/env perl
	# 사용법
	# perl demacboogi.pl *.zip #zip파일만 변환
	# perl demacboogi.pl #모든파일 변환
	use 5.010;
	use strict;
	use warnings;
	use Encode qw/encode decode/;
	use Unicode::Normalize qw/compose/;
	use File::Copy;

	{
	/* ~/Library/KeyBindings/DefaultKeyBinding.dict

	See https://gist.github.com/zsimic/1367779, prefix cheatsheet:
	Char Short Key
	$ S- Shift ⇧
	^ C- CTRL ⌃
	~ O- Option ⌥ (⊞ Win key position on PC)
	@ M- Command ⌘ (Alt position on PC)
	# Numeric Keypad

	/*
	* Copyright (c) 2013 Calvin Rien
	*
	* Based on the JSON parser by Patrick van Bergen
	* http://techblog.procurios.nl/k/618/news/view/14605/14863/How-do-I-write-my-own-parser-for-JSON.html
	*
	* Simplified it so that it doesn't throw exceptions
	* and can be used in Unity iPhone with maximum code stripping.
	*
	* Permission is hereby granted, free of charge, to any person obtaining

	/*
	Make the Facebook Like box responsive (fluid width)
	https://developers.facebook.com/docs/reference/plugins/like-box/
	*/

	/* This element holds injected scripts inside iframes that in some cases may stretch layouts. So, we're just hiding it. */
	#fb-root {
	display: none;
	}

	# FROM: http://en.wikipedia.org/wiki/Base_36#Python_implementation
	def base36encode(number):
	"""Converts an integer into a base36 string."""

	ALPHABET = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"

	if not isinstance(number, (int, long)):
	raise TypeError('This function must be called on an integer.')

	base36 = ''

	Prefer printf to the C++ iosstream methods? Now you can create a string using printf style format strings, and also append formatted string to existing strings.

	Inspired by: http://stackoverflow.com/questions/2342162

	img.grayscale.disabled {
	filter: url("data:image/svg+xml;utf8,<svg xmlns=\'http://www.w3.org/2000/svg\'><filter id=\'grayscale\'><feColorMatrix type=\'matrix\' values=\'1 0 0 0 0, 0 1 0 0 0, 0 0 1 0 0, 0 0 0 1 0\'/></filter></svg>#grayscale");
	-webkit-filter: grayscale(0%);
	}