chaosong

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

Elasticsearch: updating the mappings and settings of an existing index

Note: This was written using elasticsearch 0.9.

Elasticsearch will automatically create an index (with basic settings and mappings) for you if you post a first document:

$ curl -X POST 'http://localhost:9200/thegame/weapons/1' -d \
'{
  "_id": 1,

Install

Modify index.txt with your output path and proxy info
Use Text Builder to build configuration for Surge: $ text-builder -index /path/to/index.txt Or run $ sh build-all to build all your index files.
Import configuration via AirDrop/iTunes/Dropbox/iCloud

本人不提供任何保证和技术支持，使用者自负风险。
There are no guarantees, no any support. Use it at your own risk.

Install shellinabox

sudo apt-get install shellinabox -y
# Modify the shellinabox settings
# - lock down so only localhost allowed
# - disable ssl as we will use the verified certs provided by Caddy
sudo nano /etc/default/shellinabox
...
SHELLINABOX_ARGS="--no-beep --localhost-only --disable-ssl"
...

Download strongswan

https://www.strongswan.org/download.html

sudo apt-get update
sudo apt-get install build-essential libgmp3-dev

tar xvf strongswan.tar.gz
cd strongswan

在 V2Ray 中加入自动选择延迟最小的 outbound 的负载均衡器

下载

https://github.com/eycorsican/v2ray-core/releases/tag/v4.13.0-latency-load-balancer-v3

从源码编译

首先 checkout 这两个分支

	#!/usr/bin/env sh

	##
	# This is script with usefull tips taken from:
	# https://github.com/mathiasbynens/dotfiles/blob/master/.osx
	#
	# install it:
	# curl -sL https://raw.github.com/gist/2108403/hack.sh \| sh
	#

	# 声明：此备忘只供参考，并非权威方法，请参阅 Tor 和 ZeroNet 的安装和配置手册
	# Tor 相关 FAQ 见 http://...:43110/gfwtalk.bit/?Topic:37_13Z7XxTa7JuFat3KzzMWu3onwM6biLuurJ/+FAQ+6+1+Update+Freenet+VPS+ZeroNet+com+bit
	# ZeroNet 集成的 Tor 版本并没有及时更新，现在最新版是 0.2.9.x
	# 适用 Debian/Ubuntu/raspberryPi 等系统
	# 按照 Tor 官方文档安装最新版 Tor https://www.torproject.org/docs/debian.html.en#ubuntu
	# 墙内使用 Tor 需要前置代理，推荐使用 Shadowsocks 作为前置代理，默认本地代理端口 1080
	# Tor 和 Shadowsocks 准备就绪后修改 /etc/tor/torrc 文件

	vi /etc/tor/torrc

	package main

	import (
	"context"
	"flag"
	"fmt"
	"log"
	"net/http"
	"os"
	"os/signal"

	#!/usr/bin/env python3
	"""
	This is free and unencumbered software released into the public domain.

	Anyone is free to copy, modify, publish, use, compile, sell, or
	distribute this software, either in source code form or as a compiled
	binary, for any purpose, commercial or non-commercial, and by any
	means.

	In jurisdictions that recognize copyright laws, the author or authors