Computer Science Canada

when i try to find my run time it is always zero
Author:  B1u3z [ Tue Feb 14, 2012 2:51 pm ]
Post subject:  when i try to find my run time it is always zero
long time ;
time = System.currentTimeMillis();
( rest of program)
time = System.currentTimeMillis() - time ;
JOptionPane.showMessageDialog (null, time+"ms","time", JOptionPane.WARNING_MESSAGE);

i am trying to find my run time of my program but every time i run it states that it took 0ms. can i get some help on ho to fix this
Author:  Zren [ Tue Feb 14, 2012 3:12 pm ]
Post subject:  RE:when i try to find my run time it is always zero
What does the rest of your program do? The code is fine. Your program is probably just not resource intensive enough to have those two sections of code to happen in a different clock cycle.

If you want to confirm this, dump a Thread.sleep in there with it's appropritate exception handling.

Java:


public class Test {
        public static void main(String[] args) {
                long time;
                time = System.currentTimeMillis();
                try {
                        Thread.sleep(1000);
                } catch (InterruptedException e) {
                        // TODO Auto-generated catch block
                        e.printStackTrace();
                }
                time = System.currentTimeMillis() - time;
                JOptionPane.showMessageDialog(null, time + "ms", "time", JOptionPane.WARNING_MESSAGE);
        }
}
Author:  mirhagk [ Tue Feb 14, 2012 11:08 pm ]
Post subject:  RE:when i try to find my run time it is always zero
Your computer runs in gigahertz. That's trillions of operations every second, which is billions every million second. SO unless your code is a billion operations it won't show up.
Author:  Insectoid [ Wed Feb 15, 2012 7:52 am ]
Post subject:  Re: RE:when i try to find my run time it is always zero
mirhagk @ Tue Feb 14, 2012 11:08 pm wrote:
Your computer runs in gigahertz. That's trillions of operations every second, which is billions every million second. SO unless your code is a billion operations it won't show up.


Quote:
Thread.sleep(1000);
Author:  B1u3z [ Wed Feb 15, 2012 12:12 pm ]
Post subject:  Re: when i try to find my run time it is always zero
thanks for the help
Author:  Insectoid [ Wed Feb 15, 2012 12:40 pm ]
Post subject:  RE:when i try to find my run time it is always zero
Oh, my bad. I thought Zren was OP (as I didn't check the username) and only read the title and code snippet.

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