threadpool

C#: Asynchronous delegates vs ThreadPool.QueueUserWorkItem when initiating many connections

会有一股神秘感。 提交于 2019-12-01 10:54:58
I have to send many web service calls out to delete a bunch of records in Amazon SDB (unfortunately, rows can only be deleted one at at time currently). I am using Amazon's SDB c# library which does not use async WebRequests. Currently I use ThreadPool.QueueUserWorkItem to queue up a bunch of calls (I configured my connectionManagement maxconnection to allow for a bunch of connections) this works well..as the request is sent out, it blocks and another request is made. Is this the wrong way to achieve this goal? Should I be using async delegates and doing BeginInvoke and EndInvoke? Mehrdad

android app crashes when exceeded Thread pool 9 and queued tasks 128

妖精的绣舞 提交于 2019-12-01 10:45:27
The application conduction api calls in every 10seconds with the gps location from the network provider. And also there are several api calls can be do by the user. application is crashing with law internet or less internet connection(device data access) is there a proper way to prevent app crashing and hold the api request till the internet network available. here im posting my crash reprort stacktrace java.util.concurrent.RejectedExecutionException: Task android.os.AsyncTask$3@4206a5b0 rejected from java.util.concurrent.ThreadPoolExecutor@41e97858[Running, pool size = 9, active threads = 9,

聊聊Elasticsearch的FixedExecutorBuilder

烈酒焚心 提交于 2019-12-01 10:40:27
序 本文主要研究一下Elasticsearch的FixedExecutorBuilder FixedExecutorBuilder elasticsearch-7.0.1/server/src/main/java/org/elasticsearch/threadpool/FixedExecutorBuilder.java public final class FixedExecutorBuilder extends ExecutorBuilder<FixedExecutorBuilder.FixedExecutorSettings> { private final Setting<Integer> sizeSetting; private final Setting<Integer> queueSizeSetting; /** * Construct a fixed executor builder; the settings will have the key prefix "thread_pool." followed by the executor name. * * @param settings the node-level settings * @param name the name of the executor * @param size the fixed

Too Many Threads Exception

ぃ、小莉子 提交于 2019-12-01 10:34:56
I am facing problem in blackberry development. In my application I have to get images from the server, so i have to create a separate connection thread for each image i load from the server..but in doing so i am getting TooManyThreadsException..Any ideas regarding controlling the threads... In blackberry an application can have maximum of 16 threads running concurrently...but i have to display more than 16 images at a time... Reuse the threads, queue up all the images, and run just a couple of threads, each processing one image at a time and then moving on to the next. There is a reason the

java schedule a callable at pseudo 'fixed' rate (bell curve distribution for example)

你说的曾经没有我的故事 提交于 2019-12-01 09:57:52
问题 Currently I have a ScheduledThreadPoolExecutor which can execute a callable at a fixed rate. scheduledThreadPoolExecutor.scheduleAtFixedRate(callable, delay, waitNano, TimeUnit.NANOSECONDS); My team wants to add some randomess into the waitNano. Currently it is 1000. But we want the wait second to be 900, 1100, 800, 1200, for example. The average wait time is still 1000 but the wait second is randomly distributed, (for example like a Bell curve). I am wondering is this functionality already

Too Many Threads Exception

ぃ、小莉子 提交于 2019-12-01 09:33:19
问题 I am facing problem in blackberry development. In my application I have to get images from the server, so i have to create a separate connection thread for each image i load from the server..but in doing so i am getting TooManyThreadsException..Any ideas regarding controlling the threads... In blackberry an application can have maximum of 16 threads running concurrently...but i have to display more than 16 images at a time... 回答1: Reuse the threads, queue up all the images, and run just a

Java Thread Pool [closed]

二次信任 提交于 2019-12-01 08:48:04
I want to learn to write a thread pool in Java Can anyone point me to useful resources ? You could have a look at the source code for ThreadPoolExecutor from core java. Though why do you want to reinvent the wheel? take a look at Doug Lea's books... they are fairly old now (unless he released a new one, not sure), but the concurrent package added in 1.5 is based on his threading libraries. as far as i am concerned, he is the authority on concurrent programming in java... his books will give you the basics of what you need to understand to accomplish this task. i can only assume this is an

Simple thread pool in C++

淺唱寂寞╮ 提交于 2019-12-01 08:13:13
Could anyone point me to a sample implementation of a thread pool in C++, please? I'm looking for a very basic one without too much complexity, which would be suitable for a beginner in threading to study. Look at Intel's Thread Building Blocks . I don't know how well that library meets your "simple" criteria, but it seems to be very well thought-out and thorough. I would think that it would be worth the effort to learn if you want to do threading in C++. Boost also has some threading facilities. It may be worth to check out Qt's QThreadPool implementation. This is a very good one : threadpool

Java Concurrent Object Pool?

99封情书 提交于 2019-12-01 08:01:17
I tried to integrate an external non-thread-safe library to my web project; I found out that it's too expensive to create an instance of this object for each client thread. As a result, I would like to create an object pool which has the following property. Dynamic object creation, the objects in the pool are dynamically created instead of creating them in the constructor. The pool is initially empty, and when a client thread acquires a resource object, the pool can create a new resource on demand. Once the numbers of created objects are reached the size of the pool; then the new client

How does Pool::collect works?

 ̄綄美尐妖づ 提交于 2019-12-01 07:16:55
问题 Help me understand how exactly Pool::collect works. Pool::collect — Collect references to completed tasks public void Pool::collect ( Callable $collector ) What I assume was: Pool::collect registers a function, which will be called after each \Threaded $task is completed. So, I did: <?php $pool = new Pool(4); $pool->collect($collector); $pool->submit(new Task); Didn't work. But the following does: <?php $pool = new Pool(4); $pool->submit(new Task); $pool->collect($collector); So, I guess what