Anderson Freitas andersonfreitas

Keybase proof

I hereby claim:

I am andersonfreitas on github.
I am andersonfreitas (https://keybase.io/andersonfreitas) on keybase.
I have a public key ASAvqhkzCsBbvaamyFsr0WkiSggd-7ZO637bKLU70-Ht2go

To claim this, I am signing this object:

Bookmarklet para calcular automaticamente os impostos da NF-e

Abrir página com o bookmarklet (links com JS não funcionam no Gist)

Latency numbers every programmer should know

L1 cache reference ......................... 0.5 ns
Branch mispredict ............................ 5 ns                     on recent CPU
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 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 4X memory

	import numpy as np
	import time
	N = 6000
	M = 10000

	k_list = [64, 80, 96, 104, 112, 120, 128, 144, 160, 176, 192, 200, 208, 224, 240, 256, 384]

	def get_gflops(M, N, K):
	return MN(2.0K-1.0) / 1000*3

	import ply.lex, argparse, io

	#Usage
	# python stripcomments.py input.tex > output.tex
	# python stripcomments.py input.tex -e encoding > output.tex

	def strip_comments(source):
	tokens = (
	'PERCENT', 'BEGINCOMMENT', 'ENDCOMMENT', 'BACKSLASH',
	'CHAR', 'BEGINVERBATIM', 'ENDVERBATIM', 'NEWLINE', 'ESCPCT',

	set(CMAKE_CXX_COMPILER icpc)
	SET(CMAKE_CXX_VERBOSE_FLAG "-v")

	SET(CMAKE_CXX_FLAGS_INIT "-std=c++0x")
	SET(CMAKE_CXX_FLAGS_DEBUG_INIT "-g")
	SET(CMAKE_CXX_FLAGS_MINSIZEREL_INIT "-Os -DNDEBUG")
	SET(CMAKE_CXX_FLAGS_RELEASE_INIT "-O3 -DNDEBUG -ipo")
	SET(CMAKE_CXX_FLAGS_RELWITHDEBINFO_INIT "-O2 -g")

	SET(CMAKE_CXX_CREATE_PREPROCESSED_SOURCE "<CMAKE_CXX_COMPILER> <DEFINES> <FLAGS> -E <SOURCE> > <PREPROCESSED_SOURCE>")

	# Check style:
	proof:
	echo "weasel words: "
	sh bin/weasel *.tex
	echo
	echo "passive voice: "
	sh bin/passive *.tex
	echo
	echo "duplicates: "
	perl bin/dups *.tex

	# Byte-compiled / optimized / DLL files
	__pycache__/
	*.py[cod]

	# C extensions
	*.so

	# Distribution / packaging
	.Python
	env/