What's Spring's default queue size with a ThreadPoolTaskExecutor?
来源： https://stackoverflow.com/questions/44638056/whats-springs-default-queue-size-with-a-threadpooltaskexecutor
threadpoolexecutor
What's Spring's default queue size with a ThreadPoolTaskExecutor?
来源： https://stackoverflow.com/questions/44638056/whats-springs-default-queue-size-with-a-threadpooltaskexecutor
python ThreadPoolExecutor close all threads when I get a result
来源： https://stackoverflow.com/questions/63208371/python-threadpoolexecutor-close-all-threads-when-i-get-a-result
Connection pool is full, discarding connection with ThreadPoolExecutor and multiple headless browsers through Selenium and Python
问题 I'm writing some automation software using selenium==3.141.0 , python 3.6.7 , chromedriver 2.44 . Most of the the logic is ok to be executed by the single browser instance, but for some part i have to launch 10-20 instances to have a decent execution speed. Once it comes to the part which is executed by ThreadPoolExecutor , browser interactions start throwing this error: WARNING|05/Dec/2018 17:33:11|connectionpool|_put_conn|274|Connection pool is full, discarding connection: 127.0.0.1 WARNING
workerCountOf() method in ThreadPoolExecutor java
问题 I am trying to understand ThreadPoolExecutor class.I found some final variables declared in that class and unable to understand their use. private final AtomicInteger ctl = new AtomicInteger(ctlOf(RUNNING, 0)); private static final int COUNT_BITS = Integer.SIZE - 3; //29 private static final int CAPACITY = (1 << COUNT_BITS) - 1; //536870911 00011111111111111111111111111111 // RUN_STATE is stored in the high-order bits private static final int RUNNING = -1 << COUNT_BITS; //-536870912
Java里阻塞线程的三种实现方法
在日常开发中，我们有时会遇到遇到多线程处理任务的情况，JDK里提供了便利的ThreadPoolExecutor以及其包装的工具类Executors。但是我们知道ExecutorService.excute(Runnable r)是异步的，超过线程池处理能力的线程会被加入到执行队列里。有时候为了保证任务提交的顺序性，我们不希望有这个执行队列，在线程池满的时候，则把主线程阻塞。那么，怎么实现呢？ 最直接的想法是继承ThreadPoolExecutor，重载excute()方法，加入线程池是否已满的检查，若线程池已满，则等待直到上一个任务执行完毕。这里ThreadPoolExecutor提供了一个afterExecute(Runnable r, Throwable t)方法，每个任务执行结束时会调用这个方法。 同时，我们会用到concurrent包的ReentrantLock以及Condition.wait/notify方法。以下是实现代码(代码来自： http://www.cnblogs.com/steeven/archive/2005/12/08/293219.html )： <!-- lang: java --> private ReentrantLock pauseLock = new ReentrantLock(); private Condition unpaused =
线程池ThreadPoolExecutor详解
3 月，跳不动了？>>> 一简介 线程的使用在java中占有极其重要的地位，在jdk1.4极其之前的jdk版本中，关于线程池的使用是极其简陋的。在jdk1.5之后这一情况有了很大的改观。Jdk1.5之后加入了java.util.concurrent包，这个包中主要介绍java中线程以及线程池的使用。为我们在开发中处理线程的问题提供了非常大的帮助。 二：线程池 线程池的作用： 线程池作用就是限制系统中执行线程的数量。 根据系统的环境情况，可以自动或手动设置线程数量，达到运行的最佳效果；少了浪费了系统资源，多了造成系统拥挤效率不高。用线程池控制线程数量，其他线程排队等候。一个任务执行完毕，再从队列的中取最前面的任务开始执行。若队列中没有等待进程，线程池的这一资源处于等待。当一个新任务需要运行时，如果线程池中有等待的工作线程，就可以开始运行了；否则进入等待队列。 为什么要用线程池: 1.减少了创建和销毁线程的次数，每个工作线程都可以被重复利用，可执行多个任务。 2.可以根据系统的承受能力，调整线程池中工作线线程的数目，防止因为消耗过多的内存，而把服务器累趴下(每个线程需要大约1MB内存，线程开的越多，消耗的内存也就越大，最后死机)。 Java里面线程池的顶级接口是Executor，但是严格意义上讲Executor并不是一个线程池，而只是一个执行线程的工具
How can I use a custom executor for an @Async method?
问题 I am using ThreadPoolExecutor as my custom executor with @ASync annotation. In google, I have found that the task below needs to be configured in xml but I'm not sure how the myExecutor is mapped to my custom executor. <task:annotation-driven executor="myExecutor" /> Even found that in bean properties, its path is not given. How is it called then? 回答1: Four options: Declare a single bean of type TaskExecutor Declare a single bean with the name AsyncExecutionAspectSupport.DEFAULT_TASK_EXECUTOR
clearReferencesThreads XXX but has failed to stop it.
停掉Tomcat出现如下异常 org.apache.catalina.loader.WebappClassLoaderBase.clearReferencesThreads The web application [ROOT] appears to have started a thread named [pool-3-thread-4] but has failed to stop it. This is very likely to create a memory leak. Stack trace of thread: sun.misc.Unsafe.park(Native Method) java.util.concurrent.locks.LockSupport.park(LockSupport.java:175) java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:2039) java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:442) java.util.concurrent.ThreadPoolExecutor
Source Attachment does not contain the source for the file ThreadPoolExecutor.class
问题 I am working on an android project which uses the webservice I have created. It was working fine few minutes earlier but suddenly it started to give below error. the source attachment does not contain the source for the file threadpoolexecutor.class Logcat error is : 07-10 11:30:22.844: E/AndroidRuntime(1707): FATAL EXCEPTION: AsyncTask #1 07-10 11:30:22.844: E/AndroidRuntime(1707): java.lang.RuntimeException: An error occured while executing doInBackground() 07-10 11:30:22.844: E