control and simulation - SMP

I am using a LabVIEW Real-Time 2012 and a Desktop RIO for some real-time 
simulations. The CPU has four cores. I have a problem when I try to run 
multiple control & simulation loops in parallel on different cores. I have 
manually assigned different cores to the loops and they are running, but not at 
the same time. I need them to have exactly the same simulation time, 
synchronized to the CPU. Is this possible?

Thanks a lot!

Best regards,
Sinkva