Arjun Suresh (talk | contribs) (Created page with "Page table are stored in memory , which has access time of 100 ns. The TLB holding 8 page table entries, has an access time of 10 ns. Using execution of process , it is found...") |
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| − | Page | + | Page tables are stored in memory , which has access time of 100 ns. The TLB holding 8 page table entries, has an access time of 10 ns. |
Using execution of process , it is found that 85 % of the time, a required page table entry exist in TLB and only 2 % of the total references causes page fault. Page replacement time is 2 ms . Calculate the effective memory access time , assuming page memory access requires 2 memory accesses and TLB requires one memory access. | Using execution of process , it is found that 85 % of the time, a required page table entry exist in TLB and only 2 % of the total references causes page fault. Page replacement time is 2 ms . Calculate the effective memory access time , assuming page memory access requires 2 memory accesses and TLB requires one memory access. | ||
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==={{Template:Author|Arjun Suresh|{{arjunweb}} }}=== | ==={{Template:Author|Arjun Suresh|{{arjunweb}} }}=== | ||
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| + | Let S be average memory access time. | ||
| + | <!-- | ||
| + | S = Time when TLB hits (85 %)+ Time when TLB misses (15%) + Time for page faults (2% of total memory accesses) | ||
| + | = 0.85 * (10+100) | ||
| + | +0.15 * (10+100+200 + 2,000,000*2/100) | ||
| + | = 0.85 * 110 | ||
| + | +0.15(80620) | ||
| + | = 40140 | ||
| + | --> | ||
{{Template:FBD}} | {{Template:FBD}} | ||
[[Category: Non-GATE Questions from OS]] | [[Category: Non-GATE Questions from OS]] | ||
Page tables are stored in memory , which has access time of 100 ns. The TLB holding 8 page table entries, has an access time of 10 ns. Using execution of process , it is found that 85 % of the time, a required page table entry exist in TLB and only 2 % of the total references causes page fault. Page replacement time is 2 ms . Calculate the effective memory access time , assuming page memory access requires 2 memory accesses and TLB requires one memory access.
A) 38120 ns B) 40000 ns C) 40120 ns D) None
Let S be average memory access time.
Page table are stored in memory , which has access time of 100 ns. The TLB holding 8 page table entries, has an access time of 10 ns. Using execution of process , it is found that 85 % of the time, a required page table entry exist in TLB and only 2 % of the total references causes page fault. Page replacement time is 2 ms . Calculate the effective memory access time , assuming page memory access requires 2 memory accesses and TLB requires one memory access.
A) 38120 ns B) 40000 ns C) 40120 ns D) None
GATECSE