HomeworkLib
Question

21.​ A system has the following characteristics: Memory Access (read/write) : 50ns disk access : 20ms...

21.​ A system has the following characteristics:

Memory Access (read/write) : 50ns
disk access : 20ms
TLB access : 10ns
TLB hit ratio : 90%
page fault ratio : 5%

You may assume that all page faults require a block to be written. For this system, calculate effective memory access time assuming that 2­level paging is used. Show your work.

engineering   Computer-Science   
0 0
Add a comment Improve this question Transcribed image text
Next > < Previous
Sort answers by oldest

Homework Answers

Request Professional Answer

Request Answer!

We need at least 10 more requests to produce the answer.

0 / 10 have requested this problem solution

The more requests, the faster the answer.

Request! (Login Required)

All students who have requested the answer will be notified once they are available.
Know the answer?
Add Answer to:
21.​ A system has the following characteristics: Memory Access (read/write) : 50ns disk access : 20ms...
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Log In

Sign Up

Similar Homework Help Questions

  • If the page fault rate is given by F, and the TLB hit rate is given...

    If the page fault rate is given by F, and the TLB hit rate is given by H. Both F & H are in the range [0,1]. Give a formula for the effective memory access time of a paging system if the normal memory access time is N, and the time it takes to serve the page fault (i.e. to read the page from disk and update the page able) is T, and the time it takes to read the...

  • Number Name 3. Assuming no page fault on a page table access, what is the processor...

    Number Name 3. Assuming no page fault on a page table access, what is the processor memory access time for the system depicted in the above figure, for a physical memory with 50ns read/write times? 4. Now, assume that the memory system has a translation look-aside buffer (TLB). The TLB requires 10 ns to determine a hit or mess. The physical memory system has an access time of 50ns. You may assume that page fault rate for the application is...

  • 7 pts Question 30 Consider a computer system that uses virtual memory with paging with a...

    7 pts Question 30 Consider a computer system that uses virtual memory with paging with a TLB. Suppose main memory access time is 10 ns and the time to look up the TLB 1 ns. Assume no page faults and the TLB has a hit of 95%. What is the effective memory access time (express in ns) 11ns

  • Question 30 7 pts Consider a computer system that uses virtual memory with paging with a...

    Question 30 7 pts Consider a computer system that uses virtual memory with paging with a TUB. Suppose main memory access time is 10 ns and the time to look up the TLB 1 ns. Assume no page faults and the TLB has a hit of 95%. What is the effective memory access time (express in ns)

  • Q5. Consider a memory system where all pages fit in memory. The TLB takes 15 nanoseconds...

    Q5. Consider a memory system where all pages fit in memory. The TLB takes 15 nanoseconds to access and memory takes 120 nanoseconds to access. What is the effective access time for 1 level paging if the hit rate is 65%? What if it’s 95%? What is the effective access time if not all processes fit into memory and the swap time is 850,000 nanoseconds for a page fault?

  • Consider a demand-paging system with a paging disk that has an average access and transfer time of 20 milliseconds. Addresses are translated through a page table in main memory, with an access time of...

    Consider a demand-paging system with a paging disk that has an average access and transfer time of 20 milliseconds. Addresses are translated through a page table in main memory, with an access time of 1 microsecond per memory access. Thus, each memory reference through the page table takes two accesses. To improve this time, we have added an associative memory that reduces access time to one memory reference, if the page-table entry is in the associative memory. Assume that 80...

  • Consider a demand-paging system with a paging disk that has an average access and transfer time...

    Consider a demand-paging system with a paging disk that has an average access and transfer time of 20 milliseconds. Addresses are translated through a page table in main memory, with an access time of 1 microsecond per memory access. Thus, each memory reference through the page table takes two accesses. To improve this time, we have added an associative memory that reduces access time to one memory reference, if the page-table entry is in the associative memory. Assume that 80...

  • 3. Consider a paging system with the page table in memory. A. If a memory reference...

    3. Consider a paging system with the page table in memory. A. If a memory reference takes 100 nanoseconds, how long does a paged memory reference take? B. If we add TLBs, and 75 percent of all page-table references are found in the TLBs, what is the effective memory reference time? (Assume that finding a page-table entry for the TLBs takes 20 nanoseconds.) C. It takes 750 milliseconds to service a page fault. The page fault rate is .001. What...

  • Answer the following questions a) If average page-fault service time is 9 milliseconds, a memory access...

    Answer the following questions a) If average page-fault service time is 9 milliseconds, a memory access time is 202 nanoseconds, and the page fault rate is 0.2% then what is the effective access time (in nanoseconds) for a demand paging scheme. b) Under what circumstances do page faults occur? Describe the actions taken by the operating system when a page fault occurs.

  • 3. Consider a paging system with the page table in memory. A. If a memory reference takes 100 nanoseconds, how long does...

    3. Consider a paging system with the page table in memory. A. If a memory reference takes 100 nanoseconds, how long does a paged memory reference take? B. If we add TLBs, and 75 percent of all page-table references are found in the TLBs, what is the effective memory reference time? (Assume that finding a page-table entry for the TLBs takes 20 nanoseconds.) C. It takes 750 milliseconds to service a page fault. The page fault rate is .001. What...

ADVERTISEMENT
Free Homework Help App
Download From Google Play
Scan Your Homework
to Get Instant Free Answers
Need Online Homework Help?
Ask a Question
Get Answers For Free
Most questions answered within 3 hours.
ADVERTISEMENT
ADVERTISEMENT