Small question about boost::thread

Maybe; it all depends on how the OS wants to schedule them.

Is there a way to force the use of the available cores on windows?

Well, you can set ThreadAffinity however this can mess up the scheduler slightly.

That said, the window scheduler is generally going to do 'the right thing' with regards to allocating resources so its probably not something you need to worry about. The biggest problem is being bounced from core to core, however this tends to be down to the usage of sleep() instead of SwitchToThread(), the latter apprently stopping, or at least helping, that problem.

You can use SetThreadAffinity, but is there any particular reason why you think you need this? Typically the OS does the best job possible.

Edit: too slow!

Ok then I´ll put my trust in my OS and hope he performs well :) thanks guys