［blocking network call］ 阻塞的网络调用: 1.gethostbyname(): does not return until it has succeeded or failed in resolving www.xxx.com 2. connect(): does not return until it has connected 3. recv(): calls do not return until they have received data or a close…

Maybe this is due to the current version, but the current answer doesn't work on my system (Docker 0.7.2 with base Ubuntu image). The solution is explained here in the official Docker documentation. For the lazy ones: edit /etc/default/ufw to change…

小结: 1.基于java并发模型 Scala concurrency is built on top of the Java concurrency model. 2. 将每个请求放入一个新的线程 The main drawback with this code is that only one request at a time can be answered! You could put each request in a Thread. Simply change (new Handler…

近期用户反馈某台服务器总感觉性能不是很好存在卡顿,于是今天远程上去分析. 打开任务管理器发现CPU使用率非常低,内存使用也在接受范围内(10/64G).不过我有一个偏好就是不喜欢用系统自带的任务管理器查看资源,顺手把procexp搞上去再看一遍.发现rundll32.exe显示占用了62%左右的CPU资源,加载执行一个名为HalPluginServices.dll.之前看过<深入解析Windows操作系统>,就对前缀Hal(Hardware Abstraction Layer)有个概念.和它并…

原文地址:http://techblog.netflix.com/2016/09/zuul-2-netflix-journey-to-asynchronous.html We recently made a major architectural change to Zuul, our cloud gateway. Did anyone even notice!?  Probably not... Zuul 2 does the same thing that its predecessor d…

Qt4与Qt3的主要不同 1)QT4 中提供了大量新控件,虽然它也保持了旧的控件,并命名为Qt3XXX,但是这样的控件没准在今后的哪个QT版本中就不被支持了,所以还是换吧,控件替换的 工作是巨大的,这些新的控件使用了新的方法.属性.和事件名称,虽然是比以前更规范了,但是对于升级旧代码来说,则增加了大量工作. 2)既然要更新控件,那么你就需要使用QDesigner工具来重新画界面了,OK,重画只是纯体力劳动,好说.界 面画好后,使用uic来根据界面生成代码文件,QT3的uic可以自动生成.h和.c…

在使用chrome的时候F12的开发者工具中有个network,其中对每个请求有个timeline的说明,当鼠标放上去会有下面的显示: 这里面的几个指标在说明在chrome使用文档有说明: 下面我用人类的语言理解下: Proxy 与代理服务器的连接时间. 比如我使用了switch proxy搭建了一个gae,本地启动的goagent就是proxy server.我的所有页面请求都和这个goagent进行下交互才确定的,所以这里的Proxy所花费的时间就是和goAgent交互的时间了. DNS L…

kafka.network包主要为kafka提供网络服务,通常不包含具体的逻辑,都是一些最基本的网络服务组件.其中比较重要的是Receive.Send和Handler.Receive和Send封装了底层的入站(inbound)和出站(outbound)字节传输请求,而Handler在此二者间做了一个映射.一个handler就代表了一个函数,该函数接收Receive类型的对象并返回Send类型的对象.用户可以处理过冲中添加逻辑代码,并且需要自行捕获传输读写过程中的异常,将其序列化之后发送给客户端.…

目录 . 引言 . IO机制简介 . 阻塞式IO模型(blocking IO model) . 非阻塞式IO模型(noblocking IO model) . IO复用式IO模型(IO multiplexing model) . 信号驱动式IO模型(signal-driven IO model) . 异步IO式IO模型(asynchronous IO model) . Linux Socket IO技术简介 . IO模型编程举例 0. 引言 Linux将所有外部设备都看做一个文件来进行操作.因此…

Nmap is short for Network Mapper. It is an open source security tool for network exploration, security scanning and auditing. However, nmap command comes with lots of options that can make the utility more robust and difficult to follow for new users…

New Lantern Version Available Upgrade Lantern for improved blocking resistance! The new version: is harder for censors to identify. restarts the trust network to reflect usersʼ real relationships. This means all users will start out with zero friends…

除了自己实现之外,还有个c语言写的基于事件的开源网络库:libevent http://www.cnblogs.com/Anker/p/3265058.html 最简单的select示例: #include <stdio.h> #include <sys/time.h> #include <sys/types.h> #include <unistd.h> #define STDIN 0 // file descriptor for standard inpu…

http://technet.microsoft.com/en-us/library/cc756878(v=ws.10).aspx In this section Network Load Balancing Terms and Definitions Network Load Balancing Architecture Network Load Balancing Protocols Application Compatibility with Network Load Balancing…

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…

关于网络编程以及socket 等一些概念和函数介绍就不再重复了,这里示例性用python 编写客户端和服务器端. 一.最简单的客户端流程: 1. Create a socket 2. Connect to remote server 3. Send some data 4. Receive a reply  Python Code  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 3…

重新审视RDMA的网络支持 本文为SIGCOMM 2018会议论文. 笔者翻译了该论文.由于时间仓促,且笔者英文能力有限,错误之处在所难免:欢迎读者批评指正. 本文及翻译版本仅用于学习使用.如果有任何不当,请联系笔者删除. Abstract (摘要) The advent of RoCE (RDMA over Converged Ethernet) has led to a signifcant increase in the use of RDMA in datacenter networks…

转自:https://www.cnblogs.com/welhzh/p/4950341.html 除了自己实现之外,还有个c语言写的基于事件的开源网络库:libevent http://www.cnblogs.com/Anker/p/3265058.html 最简单的select示例: #include <stdio.h> #include <sys/time.h> #include <sys/types.h> #include <unistd.h> #de…

Transmitting Network Data Using Volley GET STARTED DEPENDENCIES AND PREREQUISITES Android 1.6 (API Level 4) or higher VIDEO Volley: Easy, Fast Networking for Android Volley is an HTTP library that makes networking for Android apps easier and most imp…

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…

Peer-to-Peer Communication Across Network Address Translators Bryan Ford Massachusetts Institute of Technology baford (at) mit.edu Pyda Srisuresh Caymas Systems, Inc. srisuresh (at) yahoo.com Dan Kegel dank (at) kegel.com J'fais des trous, des petits…

前文初步介绍了Linux用户态设备驱动,本文将介绍一个典型的案例.Again, 如对Linux用户态设备驱动程序开发感兴趣,请阅读本文,否则请飘过. Device Drivers in User Space: A Case for Network Device Driver | 用户态设备驱动:以网卡驱动为例 Hemant Agrawal and Ravi Malhotra, Member, IACSIT Abstract -- Traditionally device drivers spec…

原文:https://www.binarytides.com/python-socket-programming-tutorial/ ------------------------------------------------------- Network programming in python   This is a quick guide/tutorial on socket programming in python. Socket programming python is ve…

Chapter 7. Advanced topics http://hc.apache.org/httpcomponents-client-ga/tutorial/html/advanced.html 7.3. Using the FutureRequestExecutionService Using the FutureRequestExecutionService, you can schedule http calls and treat the response as a Future.…

Lidgren Network Library Classes   Class Description NetAESEncryption AES encryption NetBitVector Fixed size vector of booleans NetBitWriter Helper class for NetBuffer to write/read bits NetBlockEncryptionBase Base for a non-threadsafe encryption clas…

在linux中,默认情况下所有的socket都是blocking,一个典型的读操作流程大概是这样: 当用户进程调用了recvfrom这个系统调用,kernel就开始了IO的第一个阶段:准备数据.对于network io来说,很多时候数据在一开始还没有到达(比如,还没有收到一个完整的UDP包),这个时候kernel就要等待足够的数据到来. 而在用户进程这边,整个进程会被阻塞.当kernel一直等到数据准备好了,它就会将数据从kernel中拷贝到用户内存, 然后kernel返回结果,用户进程才解除b…

IEEE 802.1X是IEEE制定关于用户接入网络的认证标准(注意:此处X是大写),全称是“基于端口的网络接入控制”,属于IEEE 802.1网络协议组的一部分.于2001年标准化,之后为了配合无线网络的接入进行修订改版,于2004年完成.它为想要连接到LAN或WLAN的设备提供了一种认证机制. IEEE 802.1X is an IEEE Standard for Port-based Network Access Control (PNAC). It is part of the IEEE…

Linux Network IO Model.Socket IO Model - select.poll.epoll  原文:https://www.cnblogs.com/LittleHann/p/3897910.html 目录 0. 引言 1. IO机制简介 2. 阻塞式IO模型(blocking IO model) 3. 非阻塞式IO模型(noblocking IO model) 4. IO复用式IO模型(IO multiplexing model) 5. 信号驱动式IO模型(signal…

A computer-implemented system and method for a lock-less, zero data copy messaging mechanism in a multi-core processor for use on a modem in a telecommunications network are described herein. The method includes, for each of a plurality of processing…

A buffer management mechanism in a multi-core processor for use on a modem in a telecommunications network is described herein. The buffer management mechanism includes a buffer module that provides buffer management services for one or more Layer 2…

Disk Cache 目录 1 Overview 2 External Interface 3 Disk Structure 3.1 Cache Address 3.2 Index File Structure 3.3 Block File Structure 3.4 Cache Entry 3.5 The Big Picture 4 Implementation Notes 4.1 Lower Interface 4.2 Eviction 4.3 Buffering 4.4 Deleting…