Solved

Mono Threading

Posted on 2009-05-06
4
942 Views
Last Modified: 2013-11-23
What's the difference in terms of functions and coding between using a mono and multi threaded application if i want to calculate this:   y = 3x3 + 5x2 -10x + 10 (just an example)

Thank you.
0
Comment
Question by:VanJava
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
4 Comments
 
LVL 92

Expert Comment

by:objects
ID: 24313707
none really. it would evaluated in a single thread.
0
 
LVL 3

Expert Comment

by:nullsquid
ID: 24313836
I believe threading is useful if your calculation needs to pause for another process at different stages. for example, if the sum was

y=(a very complicated calculation which requires disk access)+(another very complicated calculation which requires disk access)

you could thread each of the (very complicated calculation which requires disk access) such that as one of the processes was waiting for the disk access before it could proceed, the other one could be using the spare flops in the cpu. But for really simple things, no improvement would be seen with multithreading, indeed, it may even be slower.
0
 

Author Comment

by:VanJava
ID: 24313893
Can you please show me the codes using mono and multi threaded application to achive above calculation so i can run it and see  my self the effectiveness of both. Thanks
0
 
LVL 4

Accepted Solution

by:
pellep earned 500 total points
ID: 24315177
Since your example is so trivial, you would get worse performance multi-threading it than doing it in one go in a single thread since the overhead-cost of setting up the threads would far out-weigh the actual calculation. Anyway, in semi-pseudo code


public class Worker1 implements Runnable {
public long result;
public void run() {
result = 3*3;
}
}
public class Worker2 implements Runnable {
public long result;
public void run() {
result = 5*2;
}
}
public class Worker3 implements Runnable {
public long result;
public void run() {
result = 10*4;
}
}
 
.....
public static void main(String[] args) {
Worker1 worker1 = new Worker1();
Thread t1 = new Thread(worker1);
t1.start();
Worker2 worker2 = new Worker2();
Thread t2 = new Thread(worker2);
t2.start();
Worker3 worker3 = new Worker3();
Thread t3 = new Thread(worker3);
t3.start();
// wait for threads to complete
t1.join();
t2.join();
t3.join();
System.out.println("" + (worker1.result + worker2.result + worker3.result));
 
}

Open in new window

0

Featured Post

Industry Leaders: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
ejb entity bean example 2 57
dao vs facade design patterns 2 75
Error building VS2105 solution from repository 1 62
maximize the sum of fractions 33 76
This is about my first experience with programming Arduino.
This article will inform Clients about common and important expectations from the freelancers (Experts) who are looking at your Gig.
In this fifth video of the Xpdf series, we discuss and demonstrate the PDFdetach utility, which is able to list and, more importantly, extract attachments that are embedded in PDF files. It does this via a command line interface, making it suitable …
Suggested Courses

752 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question