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Study Stuff for MCA Examinations - NIMCET
Study Stuff for MCA Examinations - NIMCET
Previous Year Question (PYQs)
Consider a single-level page table system, with the page table stored in the memory. If the hit rate to TLB is $80\%$, and it takes $15$ nanoseconds to search the TLB, and $150$ nanoseconds to access the main memory, then what is the effective memory access time, in nanoseconds?
Solution
TLB hit time:
$15+150=165$ ns
TLB miss time:
$15+150+150=315$ ns
Hit ratio $=0.8$, miss ratio $=0.2$
Effective memory access time:
$0.8(165)+0.2(315)$
$=132+63=195$ ns
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