LV will adapt its execution engines to multiple processors. This will begin to take advantage of multiple processors, but if the dataflow sequences things into a single chain of computations, then it will basically move the computation to one processor and the UI to the other.
You should become familiar with application Note 114 called Using LabVIEW to Create Multithreaded VIs for Maximun Performance and Reliability. If you utilize more than one combination of execution systems and priorities, you will have multiple threads which can be scheduled on two separate processors. Furthermore, you can introduce parallelism on your diagram, which will allow LabVIEW to break up individual VIs into two or more threads in some cases. Then a single VI could have the oppo
rtunity to run on separate processors (assuming the LabVIEW compiler decided to split up the VI). Again you can promote this by introducing parallelism on the diagram.