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Date Posted: 7/22/2008 1:56:18 AM  Status: Live
Operating Systems
Course Textbook Chapter Problem
Operating Systems N/A N/A N/A
Question Details:
 

 

Suppose the memory access time (Tmem) is 200 nsec ,the acess time for Translation Lookaside Buffer (TTLB) is 30 nsec and the hit ratio (HR) is 90%.Calculate the effective access time (Teffective)

 

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Date Posted: 7/22/2008 1:14:33 PM  Status: Live
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Response:
effective access time   = TLB_time * hit_ratio + (memor_access + TLB_time)(1-hit_ratio)

                                                      = 30 * hit_ratio  + ( 200 + 30 ) (1- hit_ratio)
                                                      = 30 * .9  + 230 *.1
                                                      = 27 + 23
                                                      = 50 ns



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