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case1：字节码执行

同样的python代码，经过cython编译后运行，一般情况下也比用python解释器运行要快。

因为python解释代码，本质上就是一个for/switch，对字节码的逐条执行，相比机器语言，使得CPU无法预判指令分支，也破坏指令缓存的局部化。

p1.py

vimdiff cheat sheet

##git mergetool

In the middle file (future merged file), you can navigate between conflicts with ]c and [c.

Choose which version you want to keep with :diffget //2 or :diffget //3 (the //2 and //3 are unique identifiers for the target/master copy and the merge/branch copy file names).

:diffupdate (to remove leftover spacing issues)

:only (once you’re done reviewing all conflicts, this shows only the middle/merged file)

tmux shortcuts & cheatsheet

start new:

tmux

start new with session name:

tmux new -s myname

	/*
	using official fcgi++ library
	Reference to fcgi protocol at https://tools.ietf.org/html/rfc3875#section-6.2.1
	Build: g++ main.cpp -lfcgi++ -lfcgi -o main
	Spawn: spawn-fcgi -a 127.0.0.1 -p 9105 -n -- main
	*/

	#include <iostream>
	#include <string>
	#include <thread>

	#!/usr/bin/python
	from scapy.all import *
	import time, sys
	pkts = rdpcap(sys.argv[1])
	clk = pkts[0].time
	for p in pkts:
	time.sleep(p.time - clk)
	clk = p.time
	sendp(p)

	# --------
	# Hardware
	# --------

	# Opcode - operational code
	# Assebly mnemonic - abbreviation for an operation

	# Instruction Code Format (IA-32)
	# - Optional instruction prefix
	# - Operational code

	package main

	import (
	"compress/gzip"
	"io"
	"net/http"
	"strings"
	)

	type gzipResponseWriter struct {