threadpoolexecutor

LinkedBlockingQueue put vs offer

由 安稳与你 提交于 2019-12-10 00:56:51
问题 I have a linked blocking queue in which I am performing insertion and removal operations. I need to know which one is better put or offer in case of linked blocking queue. Performance parameters are CPU utilization, memory and overall throughput. Application usage is Real time system where there can be multiple incoming requests and less threads to handle where we will need to insert element in queue. I read Java docs of put and offer there was not much difference in internal application. 回答1

Java: How to get finished threads to pickup tasks from running threads

由 一世执手 提交于 2019-12-09 22:51:01
问题 I am working on a multithreaded application with tasks that have varying run times. When one thread finishes, is there a way for it to take over some tasks from a still running thread? Here is an example. I kick off my program with 5 threads, and each have 50 tasks. When the quickest running thread finishes, another thread still has 40 tasks to complete. How can I get the finished thread to take 20 tasks from the other thread, so each continue working on 20 a piece, rather than waiting for

ExecutorService that executes tasks sequentially but takes threads from a pool

由 99封情书 提交于 2019-12-09 15:08:34
问题 I am trying to build an implementation of the ExecutorService , let's call it SequentialPooledExecutor , with the following properties. All instances of SequentialPooledExecutor share the same thread pool Calls on the same instance of SequentialPooledExecutor are executed sequentially. In other words, the instance waits for the termination of the currently executing task before start processing the next task in its queue. I am currently in the process of implementing the

What is terminating my Java ExecutorService

由 爱⌒轻易说出口 提交于 2019-12-08 20:09:09
问题 I originally saw this issue with a more complex subclass of ThreadPoolExecutor , but I have simplified so now contains not much more than some additional debugging, and still get the same problem. import com.jthink.songkong.cmdline.SongKong; import com.jthink.songkong.ui.MainWindow; import com.jthink.songkong.util.SongKongThreadFactory; import java.util.concurrent.*; import java.util.logging.Level; public class TimeoutThreadPoolExecutor extends ThreadPoolExecutor { /** * Uses the default

How to bind some variable to thread with concurrent.futures.ThreadPoolExecutor or multiprocessing.pool.ThreadPool?

由 ☆樱花仙子☆ 提交于 2019-12-08 04:09:06
问题 What I want to do is something like this: class MyThread(threading.Thread): def __init__(self, host, port): threading.Thread.__init__(self) # self._sock = self.initsocket(host, port) self._id = random.randint(0, 100) def run(self): for i in range(3): print("current id: {}".format(self._id)) def main(): ts = [] for i in range(5): t = MyThread("localhost", 3001) t.start() ts.append(t) for t in ts: t.join() I got these output: current id: 10 current id: 10 current id: 13 current id: 43 current

Play Slick exception in Specs “Task slick.backend.DatabaseComponent rejected from java.util.concurrent.ThreadPoolExecutor”

由 随声附和 提交于 2019-12-08 02:11:44
问题 I am getting a ThreadPoolException from Slick using Play when running my Spec tests, This is using Play 2.4.x, Slick 3, Specs 2? My test looks like: val jsonHeaders = FakeHeaders(Seq((CONTENT_TYPE, MimeTypes.JSON))) def fakeApp: FakeApplication = FakeApplication(additionalConfiguration = Map( "slick.dbs.default.driver" -> "slick.driver.H2Driver$", "slick.dbs.default.db.driver" -> "org.h2.Driver", "slick.dbs.default.db.url" -> "jdbc:h2:mem:test;MODE=PostgreSQL;DATABASE_TO_UPPER=FALSE" )) "Add

newFixedThreadPool() vs newCachedThreadPool() [duplicate]

由 倖福魔咒の 提交于 2019-12-07 14:37:26
问题 This question already has answers here : Executors.newCachedThreadPool() versus Executors.newFixedThreadPool() (8 answers) Closed 4 years ago . In case newCachedThreadPool() as per creates a thread pool that creates new threads as needed, but will reuse previously constructed threads when they are available whereas in case of newFixedThreadPool(int size) specify size to create the thread pool with size specified. Why isn't newFixedThreadPool(int size) implemented in newCachedThreadPool()

MultiThreading Vs ThreadPoolExecutor

由 你。 提交于 2019-12-07 00:42:13
问题 I have used multithreading in many of applications I wrote . While reading more I came across ThreadPoolExecutors . I couldn't not differentiate between the two scenario wise . Still what I understand is I should use multithreading when I have a task I want to divide a task in to multiple small tasks to utilize CPU and do the work faster . And use ThreadPoolExecutor when I have a set to tasks and each task can be run independent of each other. Please correct me if I am wrong . Thanks 回答1: A

RejectedExecutionException 128 Active Threads AsyncTaskLoader

由 ぐ巨炮叔叔 提交于 2019-12-06 13:06:07
I've searched around for solutions to RejectedExecutionException using AsyncTaskLoader but none have worked. Most of them are for AsyncTask like https://github.com/commonsguy/cwac-task/blob/master/src/com/commonsware/cwac/task/AsyncTaskEx.java but AsyncTaskLoader is kind of different. The first thing I tried was in onCreateLoader() doing this before returning a CursorLoader. if (loaderCount >= 100) { cursorLoader.setUpdateThrottle(1000000000); } All that really does is stop the loaders after 100 which is not what I want. I tried toying around with different values but it seemed like a waste of

Play Slick exception in Specs “Task slick.backend.DatabaseComponent rejected from java.util.concurrent.ThreadPoolExecutor”

由 ￡可爱￡侵袭症＋ 提交于 2019-12-06 06:29:30
I am getting a ThreadPoolException from Slick using Play when running my Spec tests, This is using Play 2.4.x, Slick 3, Specs 2? My test looks like: val jsonHeaders = FakeHeaders(Seq((CONTENT_TYPE, MimeTypes.JSON))) def fakeApp: FakeApplication = FakeApplication(additionalConfiguration = Map( "slick.dbs.default.driver" -> "slick.driver.H2Driver$", "slick.dbs.default.db.driver" -> "org.h2.Driver", "slick.dbs.default.db.url" -> "jdbc:h2:mem:test;MODE=PostgreSQL;DATABASE_TO_UPPER=FALSE" )) "Add new group" in new WithApplication(FakeApp.fakeApp){ val vg = new ViewGroup(0, "Test", "Tests") val add
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