threadpool

Confused on Java ThreadPool

由 痴心易碎 提交于 2019-12-02 09:01:27
问题 It is my first time to use Java Thread Pool for my new project, after I came across this link http://www.javacodegeeks.com/2013/01/java-thread-pool-example-using-executors-and-threadpoolexecutor.html, I am more confused on this, here is the code from the page, package com.journaldev.threadpool; public class WorkerThread implements Runnable { private String command; public WorkerThread(String s){ this.command=s; } @Override public void run() { System.out.println(Thread.currentThread().getName(

How to solve Java error “pool-1-thread-xxxx” java.lang.OutOfMemory

由 早过忘川 提交于 2019-12-02 07:46:30
I have searched the posts about this issue, but I did't see similar situation like mine. My java console shows the error message "pool-1-thread-xxxx" java.lang.OutOfMemory as the picture bellow: Red Line: CPU usage Green line: Memory usage I have increased the RAM from 6G to 10G , and set -Xms=8G -Xmx=8G -Xmn=3G in *.bat file before I start the program. I also keep watching performance monitor but the memory is always around 20%. I have no idea how could this happen. Any idea? Here is my run.bat code. @echo off javapro @java -Xoptimize -Xms8G -Xmx8G -Xmn3G -Xss1024k -XX:+UseConcMarkSweepGC -cp

聊聊HystrixMetricsPublisher

由 一笑奈何 提交于 2019-12-02 05:34:13
序 本文主要研究一下HystrixMetricsPublisher HystrixMetricsPublisher hystrix-core-1.5.12-sources.jar!/com/netflix/hystrix/strategy/metrics/HystrixMetricsPublisher.java /** * Abstract class with default implementations of Factory methods for creating "Metrics Publisher" instances for getting metrics and other related data * exposed, published or otherwise retrievable by external systems such as Servo (https://github.com/Netflix/servo) * for monitoring and statistical purposes. * <p> * See {@link HystrixPlugins} or the Hystrix GitHub Wiki for information on configuring plugins: <a * href="https://github

聊聊hystrix的queueSizeRejectionThreshold参数

由 荒凉一梦 提交于 2019-12-02 05:33:59
序 本文主要研究一下hystrix的queueSizeRejectionThreshold参数 HystrixThreadPoolProperties hystrix-core-1.5.12-sources.jar!/com/netflix/hystrix/HystrixThreadPoolProperties.java /** * Queue size rejection threshold is an artificial "max" size at which rejections will occur even if {@link #maxQueueSize} has not been reached. This is done because the {@link #maxQueueSize} of a * {@link BlockingQueue} can not be dynamically changed and we want to support dynamically changing the queue size that affects rejections. * <p> * This is used by {@link HystrixCommand} when queuing a thread for execution. * * @return {

Cancel ThreadPool .QueueUserWorkItem Task

由 ぃ、小莉子 提交于 2019-12-02 05:33:37
问题 I need to cancel a background task started using ThreadPool.QueueUserWorkItem(...). I know a BackgroundWorker has constructs especially for this sort of thing, but I believe it's overkill in this case, since no user interface is involved. By cancellation, I simply mean force the completion of the callback method. What are the pitfalls of adding something like the following to my class? // Cancellation Property. private bool _canceled; public bool CancelTask { get { return _canceled; } set {

.NET Thread Pool - Unresponsive WinForms UI

由 好久不见. 提交于 2019-12-02 03:44:26
问题 Scenario I have a Windows Forms Application. Inside the main form there is a loop that iterates around 3000 times, Creating a new instance of a class on a new thread to perform some calculations. Bearing in mind that this setup uses a Thread Pool, the UI does stay responsive when there are only around 100 iterations of this loop (100 Assets to process). But as soon as this number begins to increase heavily, the UI locks up into eggtimer mode and the thus the log that is writing out to the

Cancel ThreadPool .QueueUserWorkItem Task

由 て烟熏妆下的殇ゞ 提交于 2019-12-02 02:27:13
I need to cancel a background task started using ThreadPool.QueueUserWorkItem(...). I know a BackgroundWorker has constructs especially for this sort of thing, but I believe it's overkill in this case, since no user interface is involved. By cancellation, I simply mean force the completion of the callback method. What are the pitfalls of adding something like the following to my class? // Cancellation Property. private bool _canceled; public bool CancelTask { get { return _canceled; } set { _canceled = value; } } public void DoSomeTask() { int iterations = 50; ThreadPool.QueueUserWorkItem(new

.NET Thread Pool - Unresponsive WinForms UI

由 只愿长相守 提交于 2019-12-02 02:15:22
Scenario I have a Windows Forms Application. Inside the main form there is a loop that iterates around 3000 times, Creating a new instance of a class on a new thread to perform some calculations. Bearing in mind that this setup uses a Thread Pool, the UI does stay responsive when there are only around 100 iterations of this loop (100 Assets to process). But as soon as this number begins to increase heavily, the UI locks up into eggtimer mode and the thus the log that is writing out to the listbox on the form becomes unreadable. Question Am I right in thinking that the best way around this is

Goroutines 8kb and windows OS thread 1 mb

由 天大地大妈咪最大 提交于 2019-12-02 01:28:00
As windows user, I know that OS threads consume ~1 Mb of memory due to By default, Windows allocates 1 MB of memory for each thread’s user-mode stack. How does golang use ~8kb of memory for each goroutine , if OS thread is much more gluttonous. Are goroutine sort of virtual threads? Goroutines are not threads, they are (from the spec ): ...an independent concurrent thread of control, or goroutine , within the same address space. Effective Go defines them as: They're called goroutines because the existing terms—threads, coroutines, processes, and so on—convey inaccurate connotations. A

What change did really happen in Async Task after Android Gingerbread?

由 隐身守侯 提交于 2019-12-02 01:18:05
What change did really Android team make in Async task after android 2.3. When I executed the following code I am getting same result in both Android 2.3 and 3.0. package com.sample.asynctask; import android.app.Activity; import android.os.AsyncTask; import android.os.Bundle; import android.util.Log; public class AsyncTaskTestActivity extends Activity { private static final String TAG = "AsyncTaskTestActivity"; /** Called when the activity is first created. */ @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); /
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