threadpool

I'd like to have a ScheduledThreadPoolExecutor which also stops the last thread if there is no work to do, and creates (and keeps threads alive for some time) if there are new tasks. But once there is no more work to do, it should again discard all threads. I naivly created it as new ScheduledThreadPoolExecutor(0) but as a consequence, no thread is ever created, nor any scheduled task is ever executed. Can anybody tell me if I can achieve my goal without writing my own wrapper around the ScheduledThreadpoolExecutor ? Thanks in advance! Alex V. Actually you can do it, but its non-obvious:

I am developing my first android app. I have been created a Service class which role is to check if any new information on an external webpage. The HTTP request and service work as i should, but after a while I get these OutOfMemoryError . Are someone able to see where the Service gather all that memory? Error message 1. java.lang.OutOfMemoryError: pthread_create (stack size 16384 bytes) failed: Try again at java.lang.VMThread.create(Native Method) at java.lang.Thread.start(Thread.java:1029) at org.apache.http.impl.conn.tsccm.AbstractConnPool.enableConnectionGC(AbstractConnPool.java:140) at

I'm trying to start 6 threads each taking an item from the list files, removing it, then printing the value. from multiprocessing import Pool files = ['a','b','c','d','e','f'] def convert(file): process_file = files.pop() print process_file if __name__ == '__main__': pool = Pool(processes=6) pool.map(convert,range(6)) The expected output should be: a b c d e f Instead, the output is: f f f f f f What's going on? Thanks in advance. Part of the issue is that you are not dealing with the multiprocess nature of pool, (note that in Python, MultiThreading does not gain performance due to Global

MY GOAL: I want run my application for 1000 users. NOW I am trying to run for 100 user. During application run, I'd like to do some process for each user that will take a minimum of one hour per user, so I'm using one thread per user. ERROR Caused by: java.lang.OutOfMemoryError: Java heap space I've tried to figure out what this means, but I'm not really sure how to resolve it. Can anybody help me? Jean Logeart This error means that your program needs more memory than your JVM allowed it to use! Therefore you pretty much have two options: Increase the default memory your program is allowed to

threadpool模型： 调用方通过调用api将任务，装进queue里，然后会有一个机制监事queue里有没有task，如果有task，就分配给某个worker去执行。workers代表线程池的话.worker就是某条线程了。 线程池的构造方法： Executor框架最核心的类是ThreadPoolExecutor，他是线程池的实现类，主要由下列7个组件构成。 package java.util.concurrent; public ThreadPoolExecutor(int corePoolSize, int maximumPoolSize, long keepAliveTime, TimeUnit unit, BlockingQueue<Runnable> workQueue, ThreadFactory threadFactory, RejectedExecutionHandler handler) { if (corePoolSize < 0 || maximumPoolSize <= 0 || maximumPoolSize < corePoolSize || keepAliveTime < 0) throw new IllegalArgumentException(); if (workQueue == null || threadFactory == null |

I use ScheduledExecutorService to schedule some tasks which need to run periodically. I want to know whether this code works to recover the schedule when an exception happens. ScheduledExecutorService service = Executors.newScheduledThreadPool(1); this.startMemoryUpdateSchedule(service);//See below method //Recursive method to handle exception when run schedule task private void startMemoryUpdateSchedule(ScheduledExecutorService service) { ScheduledFuture<?> future = service.scheduleWithFixedDelay(new MemoryUpdateThread(), 1, UPDATE_MEMORY_SCHEDULE, TimeUnit.MINUTES); try { future.get(); }