Consider a cache memory having hit ratios for read and write operations are80% and 90% respectively. If there is miss (either for read and for write ) entire 2word block is to be through from main memory to cache. Let there are 30% updations. The cache access time is 20 ns/word main memory access time is 100ns/word.what is the efficiency of the cache using the write back scheme? (a) 15.5 million words /sec. (b) 16.5 million words /sec. (c)14.5million words /sec. (d)13.5 million words /sec
