simics or tau?

Is there somebody that use SIMICS or TAU?

are good tools to profiling my code? I see that SIMICS is also a virtual platform hardware dipendent so i can run different simulation on different hardware while tau is a simple profiling tool. Is there somebody that can give me more information about these?

thanks in advance

marco

From stackoverflow

• They are quite different... Simics is a full-system simulator that can do profiling without intrusion... among many other things.