Edu Fernández eduardo

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

In order:

Personal Development

The Passionate Programmer

Ruby

The Ruby Programming Language - David Flanagan, Yukihiro Matsumoto

Programming Ruby 1.9 - Dave Thomas, Chad Fowler, Andy Hunt

	" About:
	"
	" How often do you forget which keys you should use to select/modify strings
	" in the ' or " or in other pairs? I often use viw/ciw instead of vi'/vi" for
	" the first time because it easier for my fingers (but after that I remember
	" about vi'). This script allows you always use the same shortcut for all
	" cases. When you want to select string in the ' use viv. Do you want to
	" select all in the '()'? Use viv. All in the '[]'? Use viv.
	"
	" How it works:

	# The fact that YAML.load will instantiate arbitrary ruby objects
	# means that calling `YAML.load` on untrusted data is virtually always
	# equivalent to executing arbitrary code in a complex app.

	# This code fragment globally neuters YAML to disable this behavior,
	# which should (hopefully) cut off all such attacks from the start.

	# I don't promise this closes all possible attacks, but this closes
	# off the trivial case. You should audit and upgrade all your
	# dependencies, as well.

	config defaultToCurrentScreen true
	config windowHintsShowIcons true
	config windowHintsIgnoreHiddenWindows false
	config windowHintsSpread true
	config windowHintsSpreadPadding 40
	config windowHintsSpreadSearchWidth 80
	config windowHintsSpreadSearchHeight 80
	config switchIconPadding 2
	config switchBackgroundColor 50;53;58;0.7
	config switchSelectedPadding 4

	#!/bin/sh

	WIDTH=`xdpyinfo \| grep 'dimensions:' \| cut -f 2 -d ':' \| cut -f 1 -d 'x' `&&
	HALF=$(($WIDTH/2)) &&
	wmctrl -r :ACTIVE: -b remove,maximized_horz &&
	wmctrl -r :ACTIVE: -b add,maximized_vert &&
	wmctrl -r :ACTIVE: -e 0,0,0,$HALF,-1

	# Encryption functions. Requires the GNUpg "gpg" commandline tool. On OS X, "brew install gnupg"
	# Explanation of options here:
	# --symmetric - Don't public-key encrypt, just symmetrically encrypt in-place with a passphrase.
	# -z 9 - Compression level
	# --require-secmem - Require use of secured memory for operations. Bails otherwise.
	# cipher-algo, s2k-cipher-algo - The algorithm used for the secret key
	# digest-algo - The algorithm used to mangle the secret key
	# s2k-mode 3 - Enables multiple rounds of mangling to thwart brute-force attacks
	# s2k-count 65000000 - Mangles the passphrase this number of times. Takes over a second on modern hardware.
	# compress-algo BZIP2- Uses a high quality compression algorithm before encryption. BZIP2 is good but not compatible with PGP proper, FYI.

	#!/usr/bin/env bash

	set -e
	if [[ $# > 0 ]]; then
	case "$1" in

	-h \| -\? \| --help )
	{
	echo "Add a todo:"
	echo " todo Reformulate the widget plans."