comp.lang.java.programmer

Daniel Pitts wrote:
> I have a program I'm working on (a ray tracer to be exact) that uses
> multiple threads to do the hard work.
> According to windows task manager, I'm only utilizing around 50%(±10%)of
> my CPU power.
>
> This makes me think that either I'm spending too much time synchronizing
> (darn), or I'm only using one CPU.
>
> Anyone have suggestions on which it is? I'm using a BlockingDeque to
> pass my work load off to worker threads, and I thought that wouldn't
> have a lot of synch cost to it.

On Windows with a Pentium D processor and only one thread running, the
processors run at a total of about 50%, one using 60% and the other 40%.
If I run two threads, then both run at 100%. I don't know what this
means but it is interesting. I think there are a lot of scheduling
issues that are obscured.

public class test7 implements Runnable {
public void run() {
while (true) ;
}
public static void main(String[] args) {
new Thread(new test7()).start();
new Thread(new test7()).start();
}
}

--

Knute Johnson
email s/nospam/knute/

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