davidxia

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
Send 1K bytes over 1 Gbps network        10,000   ns    0.01 ms
Read 4K randomly from SSD               150,000   ns    0.15 ms
Read 1 MB sequentially from memory      250,000   ns    0.25 ms
Round trip within same datacenter       500,000   ns    0.5  ms

davidxia

NYC Lunch and Learn

September 7, 2012

Neville Li & David Xia

Use Command Line Shortcuts

Basic

davidxia

davidxia

#/bin/bash

# Debian package dependencies:
# build-essential - for GCC, GNU Make, etc.
# curl - obviously
# exuberant-ctags - for Vim Tagbar
# git - obviously
# tmux - obviously
# vim-nox - Vim with python and ruby support
# zsh - obviously

davidxia

NYC Lunch and Learn

September 21, 2012

Neville Li & David Xia

To me vi is zen. To use vi is to practice zen. Every command is a koan. Profound to the user, unintelligible to the uninitiated. You discover truth every time you use it. — Satish Reddy

Vim Basics

davidxia

# Default Theme

if patched_font_in_use; then
  TMUX_POWERLINE_SEPARATOR_LEFT_BOLD="⮂"
	TMUX_POWERLINE_SEPARATOR_LEFT_THIN="⮃"
	TMUX_POWERLINE_SEPARATOR_RIGHT_BOLD="⮀"
	TMUX_POWERLINE_SEPARATOR_RIGHT_THIN="⮁"
else
	TMUX_POWERLINE_SEPARATOR_LEFT_BOLD="◀"
	TMUX_POWERLINE_SEPARATOR_LEFT_THIN="❮"

davidxia

#!/bin/bash
#
# Build and iPhone Simulator Helper Script
# David Xia 2013
#
# WARN: - if your .xcodeproj name is not the same as your .app name,
#           this won't work without modifications
#       - you must run this script in where your .xcodeproj file is

WORKSPACE=$1

davidxia

# name: davidxia
# A Powerline-inspired theme for FISH
#
# # README
#
# In order for this theme to render correctly, you will need a
# [Powerline-patched font](https://gist.github.com/1595572).
 
## Set this options in your config.fish (if you want to :])
set -g theme_display_user yes

davidxia

Keybase proof

I hereby claim:

• I am davidxia on github.
• I am davidxia (https://keybase.io/davidxia) on keybase.
• I have a public key whose fingerprint is 13B7 FE7F 06B3 7836 0C07 C86A 3446 9DFB DC90 312C

To claim this, I am signing this object:

davidxia

http https://ghe.spotify.net/api/graphql "Authorization: Bearer $github_access_token" query='{
     user(login: "davidxia") {
       pullRequests(first: 100, states: OPEN) {
         totalCount
         nodes {
           number
           repository {
             name
             owner {
               login