Anti Pattern - ThreadLocal variables with Thread Pool（转）

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Anti Pattern - ThreadLocal variables with Thread Pool（转）

In a previous post, I wrote the usage and benefits of ThreadLocal based instance variables in concurrent applications. This seemingly innocent and fail-proof implementation will provide clear data separation and visibility between threads in multi-th…

The CLR's Thread Pool

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…

Improve Scalability With New Thread Pool APIs

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…

mysql thread pool

转自:http://blog.csdn.net/wyzxg/article/details/8258033 mysql 线程处理流程图: Mysql支持单线程和多线程两种连接线程模式,如果单线程,则在同一时刻,只能有一个connection连接到Mysql,其他的连接会被挂起.如果是多线程,则同一时刻可以支持多个connection同时连接到服务器.mysql使用哪种线程模式通过下面变量控制. mysql> show variables like '%thread_handling%';+---…

Thread pool引起的程序连接数据库响应慢

数据库版本:percona-mysql 5.6.16 在很长一段时间,都会出现程序连接数据库,出现响应慢的情况,正常在几到几十毫秒之间,但是偶尔会出现上百毫秒的情况: 开始由于开发重新设置并调整过程序连接池,一直怀疑是连接池的问题,但是问题依旧: 因为使用的版本是percona-mysql 5.6.16 并且使用了数据库连接池.Thread Pool根据参数thread_pool_size被分为若干个group,每个group维护client 发起的 connections,当MySQL建立…

Reporting Service 告警"w WARN: Thread pool pressure. Using current thread for a work item"

如果Reporting Service偶尔出现不可访问或访问出错情况,这种情况一般没有做监控的话,很难捕捉到.出现这种问题,最好检查Reporting Service的日志文件. 今天早上就遇到这样一个案例,应用程序监控到调用SQL SERVER 2005的Reporting Service出现Method failed: HTTP/1.1 500 Internal Server Error .检查C:\Program Files\Microsoft SQL Server\MSSQL.3\Rep…

MySQL thread pool【转】

本文来自:http://blog.chinaunix.net/uid-26896862-id-3993773.html 刚刚经历了淘宝的双11,真实感受到了紧张的氛围.尽管DB淡定的度过,但是历程中的波折,可谓惊心动魄.其中MySQL在大量连接(万级)的场景下,表现出性能远远低于预期,并且出现明显的波动,成为一个非常重要的问题.问题虽然解决,但是后续的思考和方法的探索,仍然继续.以下是在MySQL层增加Thread pool方式,解决大量连接问题. 1.<MySQL Thread Pool: P…

worksteal thread pool

worksteal的场景对于一个线程池,每个线程有一个队列,想象这种场景,有的线程队列中有大量的比较耗时的任务堆积,而有的线程队列却是空的,现象就是有的线程处于饥饿状态,而有的线程处于消化不良的状态,这时就需要一种方法来解决这个问题. 需要worksteal,顾名思义就是任务窃取,当一个线程处于饥饿状态时,它就会去其它的线程队列中窃取任务,解决线程饥饿导致的效率底的问题. worksteal要点每个工作线程将任务放到它内部的队列中: 队列是一个双端队列,支持LIFO的push_front和p…

CLR thread pool

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…

MySQL Thread Pool: Problem Definition

A new thread pool plugin is now a part of the MySQL Enterprise Edition.In this blog we will cover the problem that the thread pool is solvingand some high-level description of how it solves this problem. In the traditional MySQL server model there is…

Thread Pool Engine, and Work-Stealing scheduling algorithm

http://pages.videotron.com/aminer/threadpool.htm http://pages.videotron.com/aminer/zip/threadpool.zip FPC Pascal v2.2.0+ / Delphi 5+ http://pages.videotron.com/aminer/zip/pthreadpool_xe4.zip (for Delphi XE to XE4) http://pages.videotron.com/aminer/z…

DUBBO Thread pool is EXHAUSTED!

一.问题在测试环境遇到的异常信息,如下: 16-10-17 00:00:00.033 [New I/O server worker #1-6] WARN com.alibaba.dubbo.common.threadpool.support.AbortPolicyWithReport - [DUBBO] Thread pool is EXHAUSTED! Thread Name: DubboServerHandler-10.0.0.77:20703, Pool Size: 500 (act…

C++笔记--thread pool【转】

版权声明:转载著名出处 https://blog.csdn.net/gcola007/article/details/78750220 背景刚粗略看完一遍c++ primer第五版,一直在找一些c++小项目练手,实验楼里面有很多项目,但是会员太贵了,学生党就只能google+github自行搜索完成项目了.注:本文纯提供自己的理解,代码完全照抄,有想法的欢迎评论留言一起讨论. 本文参考: c++11线程池实现 A simple C++11 Thread Pool implementation…

MySQL--线程池(Thread Pool)

================================================================= 线程池技术在MySQL社区版中,MySQL使用one-thread-per-connection的方式来处理数据库连接,即当MySQL客户端与服务器端建立连接时会创建一个线程来专门处理该连接的所有SQL请求.one-thread-per-connection优缺点: 优点: one-thread-per-connection方式实现简单,在连接数较少或使用长连接的…

MySQL学习分享--Thread pool实现

基于<MySQL学习分享--Thread pool>对Thread pool架构设计的详细了解,本文主要对Thread pool的实现进行分析,并根据Mariadb和Percona提供的开源实现,进行简单的比较和评估. 1.<The Thread Pool Plugin> MySQL官方文档中,对Thread pool进行了详细的介绍,主要从实现和使用角度进行了说明.MySQL企业版实现通过插件方式实现,对源码逻辑没有侵入,是比较友好的方式.文档描述的实现机制方面,跟架构设计基本无…

[Done][DUBBO] dubbo Thread pool is EXHAUSTED!

异常信息: com.alibaba.dubbo.remoting.ExecutionException: class com.alibaba.dubbo.remoting.transport.dispatcher.all.AllChannelHandler error when process caught event . at com.alibaba.dubbo.remoting.transport.dispatcher.all.AllChannelHandler.caught(AllChan…

ThreadPoolExecutor – Java Thread Pool Example

https://www.journaldev.com/1069/threadpoolexecutor-java-thread-pool-example-executorservice Java thread pool manages the pool of worker threads, it contains a queue that keeps tasks waiting to get executed. We can use ThreadPoolExecutor to create t…

The threads in the thread pool will process the requests on the connections concurrently.

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…

ThreadPoolExecutor – Java Thread Pool Example（如何使用Executor框架创建一个线程池）

Java thread pool manages the pool of worker threads, it contains a queue that keeps tasks waiting to get executed. We can use ThreadPoolExecutor to create thread pool in java. Java thread pool manages the collection of Runnable threads and worker thr…

ThreadPoolExecutor – Java Thread Pool Example(java线程池创建和使用)

Java thread pool manages the pool of worker threads, it contains a queue that keeps tasks waiting to get executed. We can use ThreadPoolExecutor to create thread pool in java. Java thread pool manages the collection of Runnable threads and worker thr…

Running Code on a Thread Pool Thread_翻译

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…

使用boost实现线程池thread pool | boost thread pool example

本文首发于个人博客https://kezunlin.me/post/f241bd30/,欢迎阅读! boost thread pool example Guide boost thread pool example with cpp code code example #include <iostream> //std::cout std::endl #include <thread> //std::thread #include <future> //std::fut…

自定义parallelStream的thread pool

目录简介通常操作使用自定义ForkJoinPool 总结自定义parallelStream的thread pool 简介之前我们讲到parallelStream的底层使用到了ForkJoinPool来提交任务的,默认情况下ForkJoinPool为每一个处理器创建一个线程,parallelStream如果没有特别指明的情况下,都会使用这个共享线程池来提交任务. 那么在特定的情况下,我们想使用自定义的ForkJoinPool该怎么处理呢? 通常操作假如我们想做一个从1到1000的加法,…

mysql5.6 thread pool

从percona 的压测来看,确实很牛笔啊.提升很大. http://www.mysqlperformanceblog.com/2014/01/29/percona-server-thread-pool-improvements/ 当然,他指出目前mysql5.6 有2套thread pool ,一套是mysql企业版里面的,另外一套是maridb 的开发人员实现的,percona 在这个基础上又完善了一些,目前在percona mysql 里面可以直接用了.特别想应用一下. 2014年2月3日…

thread pool

thread pool import concurrent.futures import urllib.request URLS = ['http://www.foxnews.com/', 'http://www.cnn.com/', 'http://europe.wsj.com/', 'http://www.bbc.co.uk/', 'http://some-made-up-domain.com/'] # Retrieve a single page and report the URL an…