laurent b multitudes

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

	//
	// ViewController.swift
	// PageViewController
	//
	// Created by Miguel Fermin on 5/8/17.
	// Copyright © 2017 MAF Software LLC. All rights reserved.
	//

	import UIKit

	from matplotlib import pyplot as plt
	import cv2

	img = cv2.imread('/Users/mustafa/test.jpg')
	gray = cv2.cvtColor(img, cv2.COLOR_BGR2GRAY)

	plt.imshow(gray)
	plt.title('my picture')
	plt.show()


	for f in *.png
	do
	# Process to get File Name & 2x, 3x file names
	xNAME=`echo "$f" \| cut -d'.' -f1`
	cp "$f" "[email protected]"
	cp "$f" "[email protected]"

	# Set proper resolution to original file
	sips -s dpiHeight 72.0 -s dpiWidth 72.0 "$f"