2 votes 2 votes What is the hit ratio of a cache memory.If cache memory access time is 30ns,main memory access time is 150ns and avg access time is 42ns. CO and Architecture co-and-architecture + – rahuldb asked Nov 17, 2016 • retagged Nov 13, 2017 by Arjun rahuldb 3.4k views answer comment Share Follow See all 0 reply Please log in or register to add a comment.
Best answer 3 votes 3 votes Simultaneous Access for cache and main memory 42= H(30) + (1-H) (150) So H = 0.9 If hierarchical Access 42 =H(30) + (1-H)(150+30) H = 0.92 But in question nothing mentioned so simultaneous Access should be the ans... papesh answered Nov 17, 2016 • selected Nov 17, 2016 by Prashant. papesh comment Share Follow See all 3 Comments See all 3 3 Comments reply Arjun commented Nov 17, 2016 reply Follow Share default is not simultaneous access. 0 votes 0 votes papesh commented Nov 17, 2016 reply Follow Share Sir can u give some light on this topic ?? About simultaneous or hierarchical ...or any reference ... 0 votes 0 votes Shubhanshu commented Sep 27, 2017 reply Follow Share @Arjun if nothing is mentioned in the question then what we should take simultaneous or herarichal access??? 0 votes 0 votes Please log in or register to add a comment.
3 votes 3 votes Avg memory access time= hitratio(cache access time)+missratio(cache access time+memory access time) Because even in case of miss, we first look into cache and then access memory. here, 42= x(30)+(1-x)(180) on solving, x=0.92.. kirti singh answered Nov 17, 2016 kirti singh comment Share Follow See all 0 reply Please log in or register to add a comment.