First, please understand that even with Hyper-Threading technology, you still have only one physical processor. To take advantage of Hyper-Threading, you need to have a multithreaded application with two or more execution threads.
There are many ways to do that - you can try the compiler's -parallel option and see what you get, you can use OpenMP or you can "roll your own" threading using Linux threads. See the Optimizing Applications section of the Intel Fortran Compiler documentation for more on building multithreaded applications.
