Gate Exam

Let the page fault service time be 10ms in a computer with average memory access time being 20ns. If one page fault is generated for every 10^6 memory accesses, what is the effective access time for the memory?
option
(A) 21ns
(B) 30ns
(C) 23ns
(D) 35ns

Read Solution (Total 2)

Answer is A
7 years agoHelpfull: Yes(0) No(0)

solution is B 30ns
formula is:
effective access time for the memory =(page fault rate *page fault service time) +(1- page fault rate)*memory access time
=(1/10^6) * (10*10^-3 *10^9 ns) +[1-(1/10^6) ] * 20 ns
=10 +20 ns
=30ns
7 years agoHelpfull: Yes(0) No(0)

Gate Other Question

The lexical analysis for a modern computer language such as Java needs the power of which one of the following machine models in a necessary and sufficient sense?
(A) Finite state automata
(B) Deterministic push down automata
(C) Non-Deterministic pushdown automata
(D) Turing machine Consider a hypothetical processor with an instruction of type LW R1, 20(R2), which during execution reads a 32-bit word from memory and stores it in a 32-bit register R1. The effective address of the memory location is obtained by the addition of constant 20 and the contents of register R2. Which of the following best reflects the addressing mode implemented by this instruction for the operand in memory?
option
(A) Immediate Addressing
(B) Register Addressing
(C) Register Indirect Scaled Addressing
(D) Base Indexed Addressing