slok

Enable profiling

Default http server

import (
    _ "net/http/pprof"
    "net/http"
)

pythoninthegrass

#!/usr/bin/env bash
# SOURCE: https://eligiblestore.com/blog/2017/05/02/how-to-install-mosh-on-centos/

# ensure running as root
if [[ "$(id -u)" != "0" ]]; then
  exec sudo "$0" "$@"
fi

# install mosh
yum install -y epel-release

mbinna

Effective Modern CMake

Getting Started

For a brief user-level introduction to CMake, watch C++ Weekly, Episode 78, Intro to CMake by Jason Turner. LLVM’s CMake Primer provides a good high-level introduction to the CMake syntax. Go read it now.

After that, watch Mathieu Ropert’s CppCon 2017 talk Using Modern CMake Patterns to Enforce a Good Modular Design (slides). It provides a thorough explanation of what modern CMake is and why it is so much better than “old school” CMake. The modular design ideas in this talk are based on the book [Large-Scale C++ Software Design](https://www.amazon.de/Large-Scale-Soft

fangdingjun

// get the original destination for the socket when redirect by linux iptables 
// refer to https://raw.githubusercontent.com/missdeer/avege/master/src/inbound/redir/redir_iptables.go
//
const (
	SO_ORIGINAL_DST      = 80
	IP6T_SO_ORIGINAL_DST = 80
)

func getOriginalDst(clientConn *net.TCPConn) (rawaddr []byte, host string, newTCPConn *net.TCPConn, err error) {
	if clientConn == nil {

sing1ee

Google面试题：扔鸡蛋问题

原题描述

两个软硬程度一样但未知的鸡蛋，它们有可能都在一楼就摔碎，也可能从一百层楼摔下来没事。有座100层的建筑，要你用这两个鸡蛋通过最少的次数确定哪一层是鸡蛋可以安全落下的最高位置。可以摔碎两个鸡蛋

方法分析

看到这个题目，最保险的方法就是一层一层试验，但这样只需要一个鸡蛋就可以了。我们现在有两个鸡蛋，完全可以用有更快的方法。

jboner

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