GATE Computer Science (CS) 2018 Shift 1 Solved Paper

Question : 24 of 65

Marks: +1, -0

Consider a process executing on an operating system that uses demand paging. The average time for a memory access in the system is M units if the corresponding memory page is available in memory and D units if the memory access causes a page fault. It has been experimentally measured that the average time taken for a memory access in the process is X units.
Which one of the following is the correct expression for the page fault. It has been experimentally measured that the average time taken for a memory access in the process is X units.
Which one of the following is the correct expression for the page fault rate experienced by the process?

$( {D}- {M}) {/}( {X}- {M})$
$( {X}- {M}) {/(} {D}- {M})$
$( {D}- {X}){ /}( {D}- {M})$
$( {X}- {M}) {/}( {D}- {X})$

Validate

Solution:

EMAT

=P * S+(1-P) * M

X=P * D+(1-P) * M

X=P * D+M-P * M

X-M=P(D-M)

P=\;{X-M}/{D-M}

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