Why thread pools? Many server applications, such as Web servers, database servers, file servers, or mail servers, are oriented around processing a large number of short tasks that arrive from some remote source. A request arrives at the server in som…

Thread pools & Executors Run your concurrent code in a performant way All about thread pools # How do I use the thread pools? # Wangle provides two concrete thread pools (IOThreadPoolExecutor, CPUThreadPoolExecutor) as well as building them in as par…

原文链接:http://ifeve.com/part-1-thread-pools/ 很不错的一篇文章…

许多程序会动态创建数十个设置上百个线程.举个例子,一个web服务器可能在每一个新到来的请求时创建一个新线程,然后在请求完成后将其终止. 然而,创建一个新线程将会带来一定的耗费:它需要在内核中创建自身必要的数据结构(并且最终销毁),它需要一定时间来设置这些数据结构. 虽然内核对于创建一个新线程已经非常有效率了,但是那些需要创建成百上千线程的程序来说,这依然是性能的瓶颈所在. 线程池是被设计用来减轻这个问题.当程序开始时,它可能创建一定数量的线程并将他们放在线程池中.当其需要新线程时,他将从池子中获…

We were unable to locate this content in zh-cn. Here is the same content in en-us. .NET The CLR's Thread Pool Jeffrey Richter   Contents The Birth of the Thread Pool Capability 1: Calling a Method Asynchronously Capability 2: Calling a Method at Time…

Pooled Threads Improve Scalability With New Thread Pool APIs Robert Saccone Portions of this article are based on a prerelease version of Windows Server 2008. Details contained herein are subject to change. Code download available at: VistaThreadPool…

Thread Pooling https://msdn.microsoft.com/en-us/library/windows/desktop/ms686756(v=vs.85).aspx Thread Pools https://msdn.microsoft.com/en-us/library/windows/desktop/ms686760%28v=vs.85%29.aspx?f=255&MSPPError=-2147217396 https://github.com/dotnet/core…

I have always read that creating threads is expensive. I also know that you cannot rerun a thread. I see in the doc of Executors class: Creates a thread pool that creates new threads as needed, but will reuse previously constructed threads when they…

Servlet容器应该绝大部分(有可能全部)是Thread per Request,每个请求一个线程.此外有Thread per Connection,应该不是用于Servlet容器.请见 How are Threads allocated to handle Servlet request? 另外,大部分容器使用线程池管理线程. 上面链接中也提到在Java EE环境下不要创建太多自己的线程,要向容器申请线程,参见评论中的链接: Why is spawning threads in Java E…

原文:https://www.quora.com/How-does-a-single-thread-handle-asynchronous-code-in-JavaScript -------------------------------------------------------------------------------- Well, arguably its not true that Javascript is single threaded if you see from t…

https://docs.oracle.com/javase/tutorial/essential/concurrency/pools.html Most of the executor implementations in java.util.concurrent use thread pools, which consist of worker threads. This kind of thread exists separately from the Runnableand Callab…

The previous lesson showed you how to define a class that manages thread pools and the tasks that run on them. This lesson shows you how to run a task on a thread pool. To do this, you add the task to the pool's work queue. When a thread becomes avai…

1. 引言 正如我们所知,NGINX采用了异步.事件驱动的方法来处理连接.这种处理方式无需(像使用传统架构的服务器一样)为每个请求创建额外的专用进程或者线程,而是在一个工作进程中处理多个连接和请求.为此,NGINX工作在非阻塞的socket模式下,并使用了epoll 和 kqueue这样有效的方法. 因为满负载进程的数量很少(通常每核CPU只有一个)而且恒定,所以任务切换只消耗很少的内存,而且不会浪费CPU周期.通过NGINX本身的实例,这种方法的优点已经为众人所知.NGINX可以非常好地处理百…

1.内存优化 在bin/elasticsearch.in.sh中进行配置 修改配置项为尽量大的内存: ES_MIN_MEM=8g ES_MAX_MEM=8g 两者最好改成一样的,否则容易引发长时间GC(stop-the-world) elasticsearch默认使用的GC是CMS GC,如果你的内存大小超过6G,CMS是不给力的,容易出现stop-the-world,建议使用G1 GC JAVA_OPTS=”$JAVA_OPTS -XX:+UseParNewGC” JAVA_OPTS=”$JA…

http://scottge.net/2015/07/08/a-complete-list-of-net-open-source-developer-projects/?utm_source=tuicool NET Implementations .NET Core – Core .NET Framework C# Native – Compiles C# to native. Cosmos – C# Open Source Managed Operating System, an operat…

Scalable IO in Java http://gee.cs.oswego.edu/dl/cpjslides/nio.pdf 基本上所有的网络处理程序都有以下基本的处理过程:Read requestDecode requestProcess serviceEncode replySend reply Classic Service Designs 简单的代码实现: class Server implements Runnable { public void run() { try { Se…

并发框架分类 1. Executor相关类 Interfaces. Executor is a simple standardized interface for defining custom thread-like subsystems, including thread pools, asynchronous I/O, and lightweight task frameworks. Depending on which concrete Executor class is being u…

概要 在前面一章"Java多线程系列--"JUC线程池"02之 线程池原理(一)"中介绍了线程池的数据结构,本章会通过分析线程池的源码,对线程池进行说明.内容包括:线程池示例参考代码(基于JDK1.7.0_40)线程池源码分析(一) 创建"线程池"(二) 添加任务到"线程池"(三) 关闭"线程池" 转载请注明出处:http://www.cnblogs.com/skywang12345/p/3509954.h…

1.ES大量做FULL GC,日志如下: [2016-12-15 14:53:21,496][WARN ][monitor.jvm ] [vsp4] [gc][old][94725][4389] duration [26.9s], collections [1]/[27s], total [26.9s]/[15.9h], memory [19.7gb]->[17gb]/[19.8gb], all_pools {[young] [1.1gb]->[43.1mb]/[1.1gb]}{[surviv…

本博文讲述的ES获取系统数据的API是基于Elasticsearch 2.4.1版本的. 0. overview a. 下面将要介绍的所有的指令,都支持一个查询参数v(verbose),用来显示详细的查询结果. b. cat的所有指令,都支持一个help参数查询,帮助用户了解cat相关指令都支持那些功能. c. cat的所有指令,都支持一个h参数的查询,指定指定的列信息进行输出. 例子: 查询输出master的ip以及node name [elastic@t0-tkonline-cms-sear…

Netty是什么? 本质:JBoss做的一个Jar包 目的:快速开发高性能.高可靠性的网络服务器和客户端程序 优点:提供异步的.事件驱动的网络应用程序框架和工具 通俗的说:一个好使的处理Socket的东东 如果没有Netty? 远古:java.net + java.io 近代:java.nio 其他:Mina,Grizzly 为什么不是Mina? 1.都是Trustin Lee的作品,Netty更晚: 2.Mina将内核和一些特性的联系过于紧密,使得用户在不需要这些特性的时候无法脱离,相比下性能…

Varnish是一款高性能.开源的反向代理服务器和缓存服务器.Varnish使用内存缓存文件来减少响应时间和网络带宽消耗.这个项目是由挪威的一家报纸Verdens Gang的网络分支起始的,其架构设计和开发总监Poul-Henning Kamp是FreeBSD核心的开发人员之一,最初项目的管理与基础设施及额外开发由挪威一家Linux咨询公司Linpro提供. 说到varnish,squid就不得不提及.squid算得上是古老的缓存服务器.由于varnish先进的设计理念,性能要比squid高上许…

html,body,div,span,applet,object,iframe,h1,h2,h3,h4,h5,h6,p,blockquote,pre,a,abbr,acronym,address,big,cite,code,del,dfn,em,img,ins,kbd,q,s,samp,small,strike,strong,sub,sup,tt,var,b,u,i,center,dl,dt,dd,ol,ul,li,fieldset,form,label,legend,table,caption…

概要 在前面一章"Java多线程系列--“JUC线程池”02之 线程池原理(一)"中介绍了线程池的数据结构,本章会通过分析线程池的源码,对线程池进行说明.内容包括:线程池示例参考代码(基于JDK1.7.0_40)线程池源码分析(一) 创建“线程池”(二) 添加任务到“线程池”(三) 关闭“线程池” 转载请注明出处:http://www.cnblogs.com/skywang12345/p/3509954.html 线程池示例 在分析线程池之前,先看一个简单的线程池示例. import…

Thread Pools Most of the executor implementations in java.util.concurrent use thread pools, which consist of worker threads. This kind of thread exists separately from the Runnable and Callable tasks it executes and is often used to execute multiple…

Executors In all of the previous examples, there's a close connection between the task being done by a new thread, as defined by its Runnable object, and the thread itself, as defined by aThread object. This works well for small applications, but in…

在Linux中,给kernel传递参数以控制其行为总共有三种方法: 1.build kernel之时的各个configuration选项. 2.当kernel启动之时,可以参数在kernel被GRUB或LILO等启动程序调用之时传递给kernel. 3.在kernel运行时,修改/proc或/sys目录下的文件. 这里我简单讲的就是第二种方式了,kernel在grub中配置的启动参数. 首先,kernel有哪些参数呢? 在linux的源代码中,有这样的一个文档Documentation/kern…

http://www.onjava.com/pub/a/onjava/2001/05/30/optimization.htmlComparing the performance of LinkedLists and ArrayLists (and Vectors) (Page last updated May 2001, Added 2001-06-18, Author Jack Shirazi, Publisher OnJava). Tips: ArrayList is faster than…

The C10K problem [Help save the best Linux news source on the web -- subscribe to Linux Weekly News! ] It's time for web servers to handle ten thousand clients simultaneously, don't you think? After all, the web is a big place now. And computers are …

由于tomcat6的配置文件如下: <Connector port="80" protocol="org.apache.coyote.http11.Http11NioProtocol" connectionTimeout="20000" URIEncoding="UTF-8" useBodyEncodingForURI="true" enableLookups="false" re…