threadpool

问题 I am simulating a CPU-Bound task. Each CPU-bound task calculate factorial of 800. Each CPU-bound task is a Runnable object executed by Thread. When i increases number of threads(Each thread runs a Runnable tak) then i found some threads runs so fast in such a way that service times tends to Zero.I could not understand this behaviour.The codes are as follows. import java.math.BigInteger; public class CpuBoundJob implements Runnable { public void run() { BigInteger factValue = BigInteger.ONE;

问题 Here i attached my example that i used for performance test. Why there is so much diffrence between all this ? (This is sample console application) class Program { internal class ThreadObj { public ManualResetEvent signalComplete { get; set; } public int TaskItem { get; set; } } static void ThreadWork(object o) { ThreadObj obj = (ThreadObj)o; System.Threading.Thread.Sleep(5000); obj.signalComplete.Set(); } static void Main(string[] args) { // Using new .net 4.0 Task Stopwatch watch = new

问题 I'm new to multithreading and im trying to implement a simple thread safe queue of tasks where each thread can pull work from until there's no more tasks left. No queuing of tasks will be made by any of the threads. For testing purposeses every Task holds just a number. static pthread_mutex_t task_mutex = PTHREAD_MUTEX_INITIALIZER; typedef struct Task{ int number; }Task; typedef struct Cell{ Task t; struct Cell* next; }Cell; typedef struct TQueue{ struct Cell* head; struct Cell* tail; }TQueue

问题 I am writing an audio streamer (client-server) as a project of mine (C/C++), and I decided to make a multi threaded UDP server for this project. The logic behind this is that each client will be handled in his own thread. The problems I`m having are the interference of threads to one another. The first thing my server does is create a sort of a thread-pool; it creates 5 threads that all are blocked automatically by a recvfrom() function, though it seems that, on most of the times when I

问题 I have developed a piece of software that creates an Ontology using neo4j. Once the ontology is built, I start mapping the dataset of 2 million rows to it, which takes more or less 20 minutes to be completed. As a result, I wished to add a JFrame that shows the process execution. The code below creates at the beginning the JFrame and then it starts mapping the dataset. However, I can see during the execution the JFrame, but its components appears inside the JFrame after the mapping finishes.

问题 Problem Statement is:- Each thread uses unique ID between 1 and 1000 and program has to run for 60 minutes or more, So in that 60 minutes it is possible that all the ID's will get finished so I need to reuse those ID's again, I know several ways to do it, one way is the below that I wrote by taking help from StackOverflow, but when I tried running this, what I found is that, after few minutes of run this program gets very slow and it takes lot of time to print the ID on the console. And also

问题 I am looking to utilise running more than one one thread in my website. In this instance, I have a task where I need to fire emails off to multiple users. I have to think about the fact that there could be 100's of emails sent at one time. What I don't want, is for the end user to wait for these emails to be sent, it would take far too long. What I would like to do is send these emails on a separate thread, so that my current page can carry on processing the page. The idea is that the user

问题 I have a windows application using SqlDependency running at separated thread pool, this application represents a log monitor UI get the latest rows added in a specific table in the database and view it in a DataGridView. You can see the application source code from this LINK, or follow this script. const string tableName = "OutgoingLog"; const string statusMessage = "{0} changes have occurred."; int changeCount = 0; private static DataSet dataToWatch = null; private static SqlConnection

问题 The application I am developing processes data in consumer threads from a Blocking collection when it is done processing the data (never any more than 1ms) it spins that processed data off into a new thread from the ThreadPool to be sent to my users and stored in the database. I start a stopwatch just before I call ThreadPool.QueueUserWorkItem and stop it as one of the first things I do in the function called by ThreadPool.QueueUserWorkItem (any code before this has been clocked at less than

问题 I'm new to .net asynchronous programming(Asynchronous Programming Model), just have two questions on the relationship of worker thread and exceptions. Below is an example: private void OnPerformSearch(object sender, RoutedEventArgs e) { WebRequest req = WebRequest.Create("http://www.google.com/#q=weather"); req.BeginGetResponse(new AsyncCallback(Callback), req); // here the main thread calls BeginGetResponse() to enqueues the work in threadpool then a worker thread A will get the job done ...