Database-Management-System
March 27, 2024Question 4954 – Operating-Systems
March 27, 2024Question 2780 – Operating-Systems
In a paging system, it takes 30 ns to search translation Lookaside Buffer (TLB) and 90 ns to access the main memory. If the TLB hit ratio is 70%, the effective memory access time is :
Correct Answer: B
Question 550 Explanation:
Effective memory access(EMA)=Hit ratio*(TLB access time + Main memory access time) +(1–hit ratio) * (TLB access time + 2 * main memory time)
EAM=0.7*(30+90)+0.3(30+(2*90))
=0.7*120 + 0.3(30+(180))
=0.7*120 + 0.3*210
= 84 + 63
= 147
EAM=0.7*(30+90)+0.3(30+(2*90))
=0.7*120 + 0.3(30+(180))
=0.7*120 + 0.3*210
= 84 + 63
= 147
48ns
147ns
120ns
84ns