nl253

CSS units

Recommendations of unit types per media type:

Media	Recommended	Occasional use	Infrequent use	Not recommended
Screen	em, rem, %	px	ch, ex, vw, vh, vmin, vmax	cm, mm, in, pt, pc
Print	em, rem, %	cm, mm, in, pt, pc	ch, ex	px, vw, vh, vmin, vmax

	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

	# Advanced Bash :: Array slicing and compaction in bash

	# TL;DR

	X=(something 'whatever' "i have more S P A C E S than i can give away. arent you jealous?")

	# ${X[@]} the usual whole array
	# ${X[@]:index:length} slice from index to index+length-1 inclusive
	# ${X[@]::length} slice from 0 to length-1 inclusive
	# ${X[@]:index} slice from index to end of array inclusive

	#!/usr/bin/env python
	#

	# import modules used here -- sys is a very standard one
	import sys, argparse, logging

	# Gather our code in a main() function
	def main(args, loglevel):
	logging.basicConfig(format="%(levelname)s: %(message)s", level=loglevel)