threadpool

I have a problem which I don't really think has a solution but I'll try here anyway. My application uses a thread pool and some of the threads in this pool have an inheritable thread local variable. I've extended the ThreadPoolExecutor class to essentially clear out the thread local variable (in the afterExecute call back method) when a thread is done executing. I understand that when you have an InheritableThreadLocal variable, the childValue() method is called when the thread is initialized to get the ThreadLocal variable's value from the parent thread. However, in my case the next time the

I'm using a ThreadPoolExecutor in Java to manage a lot of running threads. I've created my own simple ThreadFactory so I can give the threads better names. The issue is that the name gets set in the Thread when the thread pool is first created and is not tied to the task that the thread pool is actually running. I understand this... my Runnables and Callables--though they have names--are actually one level of abstraction down from the ThreadPoolExecutor 's running threads. There have been some other questions on StackOverflow about creating names for ThreadPoolExecutor thread pools. (See How

I've been reading and testing and banging my head on the wall for over a day because of this error. I have some Java code in a class called Listener that looks like this ExecutorService executor = Executors.newFixedThreadPool(NTHREADS); boolean listening = true; int count = 0; while (listening) { Runnable worker; try { worker = new ServerThread(serverSocket.accept()); // this is line 254 executor.execute(worker); count++; logger.info("{} threads started", count); } catch (Exception e1){ //... } } I have been tweaking the JVM settings -Xmx (anywhere from 1 to 15G) and -Xss (anywhere from 104k

I opened up a question for this problem and did not get a thorough enough answer to solve the issue (most likely due to a lack of rigor in explaining my issues which is what I am attempting to correct): Zombie process in python multiprocessing daemon I am trying to implement a python daemon that uses a pool of workers to executes commands using Popen . I have borrowed the basic daemon from http://www.jejik.com/articles/2007/02/a_simple_unix_linux_daemon_in_python/ I have only changed the init , daemonize (or equally the start ) and stop methods. Here are the changes to the init method: def _

序 本文主要研究一下dubbo的AllDispatcher Dispatcher dubbo-2.7.3/dubbo-remoting/dubbo-remoting-api/src/main/java/org/apache/dubbo/remoting/Dispatcher.java @SPI(AllDispatcher.NAME) public interface Dispatcher { /** * dispatch the message to threadpool. * * @param handler * @param url * @return channel handler */ @Adaptive({Constants.DISPATCHER_KEY, "dispather", "channel.handler"}) // The last two parameters are reserved for compatibility with the old configuration ChannelHandler dispatch(ChannelHandler handler, URL url); } Dispatcher接口定义了dispatch方法，返回ChannelHandler AllDispatcher dubbo-2.7.3/dubbo-remoting

I've written a script that uses two thread pools of ten threads each to pull in data from an API. The thread pool implements this code on ActiveState . Each thread pool is monitoring a Redis database via PubSub for new entries. When a new entry is published, python passes the data to a function that uses python's Subprocess.POpen to execute a PHP shell to do the actual work of calling the API. This system of launching PHP shells is necessary for functionality with my PHP web app, so launching PHP shells with Python can't be avoided. This script will only be running on Linux servers. How do I

之前学习ThreadPool的使用以及源码剖析，并且从面试的角度去介绍知识点的解答。今天小强带来周期性线程池的使用和重点源码剖析。 ScheduledThreadPoolExecutor ScheduledThreadPoolExecutor：用来处理延时任务或定时任务 定时线程池类的类结构图 ScheduledThreadPoolExecutor接收ScheduleFutureTask类型的任务，是线程池调度任务的最小单位。 它采用DelayQueue存储等待的任务： 1、DelayQueue内部封装成一个PriorityQueue，它会根据time的先后时间顺序，如果time相同则根绝sequenceNumber排序； 2、DelayQueue是无界队列； ScheduleFutureTask 接收的参数: private final long sequenceNumber;//任务的序号 private long time;//任务开始的时间 private final long period;//任务执行的时间间隔 工作线程的的执行过程： 工作线程会从DelayQueue取出已经到期的任务去执行； 执行结束后重新设置任务的到期时间，再次放回DelayQueue； ScheduledThreadPoolExecutor会把待执行的任务放到工作队列DelayQueue中

If my understanding of the way the ThreadPool works is correct, one of its purposes is to limit the number of worker threads within a process that can be created at a given time. For example, if you set MaxThreads to 5 and then call QueueUserWorkItem 30 times, 30 requests will be made to the ThreadPool, but only 5 of those requests will be serviced by a new thread, while the other 25 requests will be added to the queue and serviced one at time as previous requests complete and existing threads becomes available. In the code below, however, the call to Thread.Sleep(-1) guarantees that the