1. In a direct-mapped cache with a t-bit long tag how many tag comparators would you expect to find and how many bits would they compare at a time? 2. Explain the purpose of dirty bits in a cache. 3....

1. In a direct-mapped cache with a t-bit long tag how many tag comparators would you expect to find and how many bits would they compare at a time?

2. Explain the purpose of dirty bits in a cache.

3. Give compelling reasons for a multilevel cache hierarchy.