Don't Block the Event Loop (or the Worker Pool) | Node.js https://nodejs.org/en/docs/guides/dont-block-the-event-loop/ Don't Block the Event Loop (or the Worker Pool) Should you read this guide? If you're writing anything more complicated than a brie…

协程 协程,又称微线程,纤程.英文名Coroutine. 协程的概念很早就提出来了,但直到最近几年才在某些语言(如Lua)中得到广泛应用. 子程序,或者称为函数,在所有语言中都是层级调用,比如A调用B,B在执行过程中又调用了C,C执行完毕返回,B执行完毕返回,最后是A执行完毕. 所以子程序调用是通过栈实现的,一个线程就是执行一个子程序. 子程序调用总是一个入口,一次返回,调用顺序是明确的.而协程的调用和子程序不同. 协程看上去也是子程序,但执行过程中,在子程序内部可中断,然后转而执行别的子程序,…

概述 接触网络编程,我们时常会与各种与IO相关的概念打交道:同步(Synchronous).异步(ASynchronous).阻塞(blocking)和非阻塞(non-blocking).关于概念的区别在知乎上看到一位朋友(链接)打了一个比较形象的比喻: 你打电话问书店老板有没有<分布式系统>这本书,如果是同步通信机制,书店老板会说,你稍等,”我查一下",然后开始查啊查,等查好了(可能是5秒,也可能是一天)告诉你结果(返回结果).而异步通信机制,书店老板直接告诉你我查一下啊,查好了打…

IO is a problem difficult to handle in various of systems because it  always becomes a bottleneck in data transfer. in this section, I will introduce some Java classes for two categories of data transfer,  Bytes and Characters, those classes were inc…

1.本例子意在用moquette服务器来作为消息转发,通过订阅者订阅消息,发布者发布消息,然后发布者的消息可以通过服务器转发给订阅者 服务器例子: https://github.com/andsel/moquette 核心代码为: /* * Copyright (c) 2012-2015 The original author or authors * ------------------------------------------------------ * All rights rese…

开篇介绍 本自测与面试题出自 微软BI SSIS 2012 ETL 控件与案例精讲 (http://www.hellobi.com/course/21) 课程,对于学完本课程的每一课时和阅读完相关辅助阅读博客之后,都需要通过以下自测题来巩固课程中所学习到的基本知识点.具体相关学习方法与面试准备可以参考 微软BI SSIS 2012 ETL 控件与案例精讲课程学习方式与面试准备详解 一文. 自测与面试 200 问 此自测题也可以作为面试题来准备,虽然对于 ETL 控件的面试大多不会考察到这么细的粒…

开篇介绍 微软BI SSIS 2012 ETL 控件与案例精讲 (http://www.hellobi.com/course/21) 课程从2014年9月开始准备,到2014年12月在 天善BI学院 (http://www.hellobi.com)正式上线. 100多天的时间共完成了 51个视频的录制,包含49个原创案例,总共1460余分钟,共计 24 个小时. 每一个案例的准备时间耗时 4 - 5个小时,有的案例的设计,思路的整理耗时 8 个小时 - 16 个小时. 本课程涵盖了微软 BI S…

转自:https://pawelmhm.github.io/asyncio/python/aiohttp/2016/04/22/asyncio-aiohttp.html Making 1 million requests with python-aiohttp Apr 22, 2016 - by Paweł Miech - about: asyncio, aiohttp, python In this post I’d like to test limits of python aiohttp …

Delphi Socket Architecture - Felix John COLIBRI. abstract : The architecture of the ScktComp socket CLASSes key words : Sockets, WinSock, Windows Socket, ScktComp, socket UML class diagram, socket file transfer, tClientSocket, tServerSocket, HTTP ser…

说明:以下是自己的理解答案,不是标准的答案,如有不妥烦请指出.         有些题目暂时没有答案,有知道的请留言,互相学习,一起进步. 133.请描述一下 Conditional Split 的使用方法和使用场景? 它可以写表达式吗? 它可以访问到上游数据的列,变量,以及使用函数吗?    根据不同的列的值,决定数据流的路径,可以写表达式进行判断,只能访问系统变量,用户变量,可以使用函数134.请描述一下 Data Conversion 与 Derived Column 的使用方法,以及它们…

论事件驱动与异步IO 通常,我们写服务器处理模型的程序时,有以下几种模型: (1)每收到一个请求,创建一个新的进程,来处理该请求: (2)每收到一个请求,创建一个新的线程,来处理该请求: (3)每收到一个请求,放入一个事件列表,让主进程通过非阻塞I/O方式来处理请求.(启动一个协程) 上面的几种方式,各有千秋, 第(1)中方法,由于创建新的进程的开销比较大,所以,会导致服务器性能比较差,但实现比较简单. 第(2)种方式,由于要涉及到线程的同步,有可能会面临死锁等问题. 第(3)种方式,在写应用程…

RxJava implements this operator as create. It is good practice to check the observer’s isUnsubscribed state from within the function you pass tocreate so that your Observable can stop emitting items or doing expensive calculations when there is no lo…

by Alexander Libman with Vladimir GilbourdNovember 25, 2005 Summary This article investigates and compares different design patterns of high performance TCP-based servers. In addition to existing approaches, it proposes a scalable single-codebase, mu…

来源:https://www.jianshu.com/p/62c0cd107da3 同步和异步.阻塞和非阻塞 首先要明确的是,同步(Synchronous)和异步(Asynchronous),阻塞(Blocking)和非阻塞(Non-Blocking)是两种完全不同的概念.前者指的是一种事件通知.处理机制,而后者则是程序控制流程的差异. 我们以A调用B为例来说明两者之间的区别: 阻塞 只有当B任务完成后,程序控制权才会返回给A, A得以继续执行. 非阻塞 B马上返回,此时B并没有完成,但A可以继…

我们首先得明白什么是同步,异步,阻塞,非阻塞,只有这几个单个概念理解清楚了,然后在组合理解起来,就相对比较容易了. IO模型主要分类: 同步(synchronous) IO和异步(asynchronous) IO 阻塞(blocking) IO和非阻塞(non-blocking)IO 同步阻塞(blocking-IO)简称BIO 同步非阻塞(non-blocking-IO)简称NIO 异步非阻塞(asynchronous-non-blocking-IO)简称AIO 1.BIO (同步阻塞I/O模…

Atitit  五种IO模型attilax总结 blocking和non-blocking synchronous IO和asynchronous I   1.1. .3 进程的阻塞1 1.2. 网络IO的模型大致有如下几种:1 1.3.  IO 模型的简单矩阵.如下图所示:2 2. 五种IO模型总结2 2.1. 3.1 blocking和non-blocking区别2 2.2. 3.2 synchronous IO和asynchronous IO区别2 2.3. 各个IO Model的比较如图…

python之IO多路复用 阅读目录 一 IO模型介绍 二 阻塞IO(blocking IO) 三 非阻塞IO(non-blocking IO) 四 多路复用IO(IO multiplexing) 五 异步IO(Asynchronous I/O) 六 IO模型比较分析 七 selectors模块 一 IO模型介绍 同步(synchronous) IO和异步(asynchronous) IO,阻塞(blocking) IO和非阻塞(non-blocking)IO分别是什么,到底有什么区别?这个问题…

Python之路,Day9 , IO多路复用(番外篇)   同步IO和异步IO,阻塞IO和非阻塞IO分别是什么,到底有什么区别?不同的人在不同的上下文下给出的答案是不同的.所以先限定一下本文的上下文. 本文讨论的背景是Linux环境下的network IO. 一 概念说明 在进行解释之前,首先要说明几个概念:- 用户空间和内核空间- 进程切换- 进程的阻塞- 文件描述符- 缓存 I/O 用户空间与内核空间 现在操作系统都是采用虚拟存储器,那么对32位操作系统而言,它的寻址空间(虚拟存储空间)为4…

参考: http://blog.jobbole.com/103290/ https://www.zhihu.com/question/19732473/answer/23434554 http://blog.huanghao.me/?p=95 同步和异步关注的是消息通信机制. 非阻塞和阻塞关注的是程序/线程等待消息时的状态.…

https://msdn.microsoft.com/en-us/magazine/jj991977.aspx Figure 1 Summary of Asynchronous Programming Guidelines Name Description Exceptions Avoid async void Prefer async Task methods over async void methods Event handlers Async all the way Don’t mix…

Because Play is a web application framework, most of the application logic is done by controllers responding to HTTP requests. But sometimes you will need to execute some application logic outside of any HTTP request. It can be useful for initializat…

http://stackoverflow.com/questions/2625493/asynchronous-vs-non-blocking In many circumstances they are different names for the same thing, but in some contexts they are quite different. So it depends. Terminology术语 is not applied in a totally consist…

These days there’s a wealth of information about the new async and await support in the Microsoft .NET Framework 4.5. This article is intended as a “second step” in learning asynchronous programming; I assume that you’ve read at least one introductor…

[转自]http://sahandsaba.com/understanding-asyncio-node-js-python-3-4.html Introduction I spent this summer working on a web platform running on Node.js. This was the first time I worked full-time with Node.js and one thing that became quite apparent af…

来源:http://www.codeproject.com/Articles/1608/Asynchronous-socket-communication 本地下载 Download source files - 14 Kb Download demo project - 8 Kb Introduction This article shows how to create both ends of a TCP/IP socket connection between two or more ap…

The Task: Events, Asynchronous Calls, Async and Await Almost any software application today will likely contain a long-running process. “Long-running” may be a relative term but in the Windows Runtime it is specifically anything that could take longe…

The principles behind these techniques aren't new. Filament group, for example, have published great content on loading CSS and fonts. I've written this article to document my thoughts and ideas for loading non-blocking resources. The trick to trigge…

Every now and again someone comes along and writes an R package that I consider to be a 'game changer' for the language and it's application to Data Science. For example, I consider dplyr one such package as it has made data munging/manipulation that…

Linux Asynchronous I/O Explained (Last updated: 13 Apr 2012) ******************************************************************************* by Vasily Tarasov <tarasov AT vasily dot name> Asynchronoes I/O (AIO) is a method for performing I/O operati…

Posted by Shiv Kumar on 23rd February, 2011 The Asynchronous Programming Model (or APM) has been around since .NET 1.1 and is still (as of .NET 4.0) the best/recommended solution for asynchronous I/O. Many people go down the route of using a multi-th…