nl253

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

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

Relative units

Relative units

nl253

# 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

nl253

#!/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)