gateforum test series

Question

Comments

Average memory access time = Hit time of L₁ + Miss Penalty of L₁

Miss Penalty of L₁ = Hit time of L₂ + Miss Penalty of L₂   [here take local miss rate ]

Miss Penality of L₂= 50

now calculate: by substitute each value:

Average memory access time = $1+ \frac{16}{100} \left ( 5+\frac{8}{16} \left ( 50 \right ) \right )$ = 1+4.8= 5.8

---

Make your comment as comment answer @ Anu007 

---

@ Anu007 can you please explain this formula?

Answer 1

Average memory access time=Hit time of L1+Miss rate of L1{Hit time of L2+Miss rate of L2(Hit time of memory)}

                                                = 1+ 16/100{5+8/16(50)}   =5.8 cycle