Different threads using different core of processor

Hi,

I have a doubt using threads. If I create a multithreaded program, will it be possible for me to let every thread to use one core separately and work simultaneously?

Please guide.

Thanks,
Madhu

That's up to the JVM and OS; your code can't influence that.

I am trying to implement Mapreduce. How could I make sure that performance is best by using threads?

The best way is probably to use an existing Mapreduce implementation that is tuned for concurrency already. That is not an easy thing to get right.

Java 7 has added the Fork/Join framework which should utilize the processes as efficiently as possible.