Compared to the PS-Cache, the proposal always achieves
better results even with just a single tag bit, that is, X equal
to 1 bit. The PS-Cache accesses on average to 4.6 ways and
the results greatly vary from one application to another. In
some cases like Ocean there is almost no access reduction,
whereas in others (i.e. Tomcatv) it can reduce it by more or
less 50%. The private-shared access pattern varies between
the applications greatly, hence these results.