在检查一Linux服务器时,发现日志里面有大量"lvm[12446]: Another thread is handling an event. Waiting..." Jul  4 00:01:42 localhost lvm[12446]: Another thread is handling an event. Waiting... Jul  4 00:09:36 localhost lvm[12446]: Another thread is handling an event.…

[root@db-ft-db-48 ~]# tail -f /mysqlLog/beside_index_err.log 140102 20:42:26 [Note] Slave: received end packet from server, apparent master shutdown: 140102 20:42:26 [Note] Slave I/O thread: Failed reading log event, reconnecting to retry, log 'mysql…

每年年底,系统管理员都要组织一次容灾方案的测试.演练.会在一个与生产环境网络隔离的DR环境中,启动各个"生产环境服务器",然后让各路人员参与其中测试.演练容灾方案是否可靠.这次演练中,一台Oracle数据库服务器启动的时候遇到了问题.如下所示,启动的时候遇到ORA-03113: end-of-file on communication channel错误. [oracle@mylnx6 ~]$ sqlplus / as sysdba   SQL*Plus: Release 10.2.0…

About Events in iOS Users manipulate their iOS devices in a number of ways, such as touching the screen or shaking the device. iOS interprets when and how a user is manipulating the hardware and passes this information to your app. The more your app…

线程的开启方法 进程是操作系统调度的最小单位,一个进程最少有一个主线程,而一个进程中可以开启多个线程 from threading import Thread def task(): print('A child thread') if __name__ == '__main__': # 这里是可以不用写的,但是规范起见还是写了 t = Thread(target=task) t.start() print('==>main thread') GIL锁 """ 1. P…

Introduction One of the revolutionary features of C++ over traditional languages is its support for exception handling. It provides a very good alternative to traditional techniques of error handling which are often inadequate and error-prone. The cl…

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…

一.前言 上篇的Connection Manager中,曾提及对于一个新到来的Connection,服务器会创建一个新的线程来处理这个连接. 其实没那么简单,为了提高系统效率,减少频繁创建线程和中止线程的系统消耗,Mysql使用了线程缓冲区的概念,即如果 一个连接断开,则并不销毁承载其的线程,而是将此线程放入线程缓冲区,并处于挂起状态,当下一个新的Connection到来 时,首先去线程缓冲区去查找是否有空闲的线程,如果有,则使用之,如果没有则新建线程.本问主要介绍这个线程缓冲区, 首先介绍下基…

https://developer.apple.com/library/archive/documentation/General/Conceptual/Devpedia-CocoaApp/MainEventLoop.html In the main event loop, an application continuously routes incoming events to objects for handling and, as a result of that handling, up…

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…