I am trying to implement matrix multiplication with multiple threads. Everything seems to work correctly, however, it work much slower than the usual algorithm. Here is my code Here, I create a new thread for each element in the resulting matrix. I than write these threads to an array, start them and, finally, wait for them to finish working. I’ve
Tag: multithreading
What is active thread group in Java?
There is method java.lang.ThreadGroup.activeGroupCount() returns an estimate of the number of active groups in a thread group. In response to this question, the active thread is defined. But what does active thread group mean? Answer As you noted, the terminology “active thread group” appears in the javadoc for ThreadGroup::activeGroupCount. An active thread group is a ThreadGroup containing at least one
Display output of two different Threads in two separate JavaFx TextArea’s
Hello guys so i have to make two threads that sell train tickets simultaneously and display there output on two different windows, i have create a class that generates the tickets and a Runnable but i am not sure how to display the output of the two different threads in the two different Text area boxes i have tried to
Connection Pool and thread pool setting in Java
Spring application using Hikari pool. Now for a single request from the client I have to query 10 tables(business required), and then composite the result together. And querying for each table may cost 50ms to 200ms. To speed up the response time, I create a FixedThreadPool in my service to query each table in different thread(pseudocode): Now for a single
Can’t make changes to interface in a runnable with JavaFX
In my program, I am running a separate script and I am using concurrency to run the separate script, and therefore using a class implementing Runnable. When the the separate thread is running, I want there to be a different graphic to when the thread is not running so the user can see if something is happening after pressing the
How to use a thread to run another JFrame while the main is still running
I have a jframe i want to display while my main frame is running. i want to pause my main code, until the user does the necessary actions on the other frame. I’ve read a lot of solutions but i need to see it done for my code to understand and grasp it fully. i do not want to use
How to distinguish RUNNING state from java.lang.Thread.State.RUNNABLE in Java
When a thread is RUNNABLE, it can be running, or be not. Is there a way to distinguish it from java.lang.Thread.State#RUNNABLE? All states of threads in Java doc: java.lang public class Thread.State extends Enum A thread state. A thread can be in one of the following states: NEW A thread that has not yet started is in this state. RUNNABLE
Java Fork/Join Pool : Is it right to assume that number of threads in fork join pool depends entirely on underlying number of CPU’s?
Can a developer tell fork/join pool to create certain number of threads? If yes then is it guaranteed that those many number of threads will be created by pool? Answer Source : https://docs.oracle.com/javase/7/docs/api/java/util/concurrent/ForkJoinPool.html A ForkJoinPool is constructed with a given target parallelism level; by default, equal to the number of available processors. The pool attempts to maintain enough active (or
What is C++ version of Java’s cyclic barrier?
In java, multiple threads can wait all others at a certain point so that they don’t start a new block of codes before all others finish first block: is there an exact or easy convertion to C++? Also with OpenCL, there is a similar instruction: so all neighbor threads wait each other but it is only a constrained C implementation.
I have a function, and in it i am running an thread using Anonymous class, so how to return value to that function
The code below will make it more clear: So as you can see from the code, there is a function, TCMResponse() which takes the parameters of the url which i pass, and it does web scraping, i know all these can be done using volley/ JSONParser easily. But i am just experimenting, how to parse using web scraping. So after