montanaflynn

package main

import (
	"crypto/sha256"
	"fmt"
	"strings"
	"time"
)

type block struct {

montanaflynn

Concurrency in JavaScript

Javascript is a programming language with a peculiar twist. Its event driven model means that nothing blocks and everything runs concurrently. This is not to be confused with the same type of concurrency as running in parallel on multiple cores. Javascript is single threaded so each program runs on a single core yet every line of code executes without waiting for anything to return. This sounds weird but it's true. If you want to have any type of sequential ordering you can use events, callbacks, or as of late promises.

kevinkindom

Python Socket 编程详细介绍

Python 提供了两个基本的 socket 模块：

• Socket 它提供了标准的BSD Socket API。
• SocketServer 它提供了服务器重心，可以简化网络服务器的开发。

下面讲解下 Socket模块功能。

Socket 类型

tommymarshall

[
  {
    "keys": ["control+alt+;"], "command": "align_tab",
    "args" : {
      "user_input" : ":/f"
    }
  },
  {
    "keys": ["control+alt+="], "command": "align_tab",
    "args" : {

yefuchs

#The Great Firewall (GFW) Contributors List

注：数据来源为 dblp 和 cndblp, 下面括号中的数字表示 dblp 中显示的跟方滨兴合作论文的数量

###Binxing Fang (方滨兴)

中国工程院院士,北京邮电大学教授,中国科学院计算技术研究所网络方向首席科学家
http://en.wikipedia.org/wiki/Fang_Binxing

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

vigo

#!/usr/bin/env ruby
# encoding: utf-8

# By Uğur Özyılmazel, @vigobronx | @ugurozyilmazel
# http://vigodome.com | http://ugur.ozyilmazel.com | http://github.com/vigo

def get_paged_memory_usage(match_string, paging=4096)
  mvar = 3
  if match_string.split(/[^\w]/).length > 1
    mvar = 4