hellerbarde

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

hellerbarde

In [1]: import dis

In [2]: def foo(what):
   ...:     a = []
   ...:     a = a+4
   ...:     print a[0]
   ...:     b = what[1:4]
   ...:     print b[-1]
   ...:

hellerbarde

# Be nice to your computer
alias please='sudo'
alias plz='sudo'

# file managing stuff
alias r="PYTHONOPTIMIZE=1 /usr/bin/ranger"
alias l='ls'
alias perm='stat -c %a'

# Dogit

hellerbarde

so ~/.vim/sensible.vim

"dein Scripts-----------------------------
if &compatible
  set nocompatible               " Be iMproved
endif

" Required:
set runtimepath+=/Users/phil/.vim/dein.vim

hellerbarde

\documentclass{article}
\usepackage[utf8]{inputenc}
\usepackage[english]{babel}
 
\usepackage[dvipsnames]{xcolor}
\colorlet{LightRubineRed}{RubineRed!70!}
\colorlet{Mycolor1}{green!10!orange!90!}
\definecolor{Mycolor2}{HTML}{00F9DE}

\definecolor{matrixcolor}{HTML}{FF0000}