Regarding demand paging, assume an average page fault service time = 25 ms and a memory...
Regarding demand paging, assume an average page fault service time = 25 ms and a memory access time of 100 ns (ms = milliseconds, 1/1000 sec; ns = nanoseconds, 1/1,000,000,000 sec). Calculate the effective access time in ns. Given a page fault rate of 1/1000, calculate the factor by which the computer would be slowed down over not incurring any page fault.
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Regarding demand paging, assume an average page fault service
time = 25 ms and a memory...
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...
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...
Problem 4 (13 points) Assume we have a demand-paged memory. Assume that the time needed to access...
Problem 4 (13 points) Assume we have a demand-paged memory. Assume that the time needed to access the page table is negligible. It requires 8 milliseconds to handle a page fault if an empty page is available or the replaced page is not dirty, and 20 milliseconds if the replaced page is dirty. Memory access time is 100 nanoseconds. Assume that the page to be replaced is dirty 70 percent of the time. What is the maximum acceptable page-fault rate...
8. (5 points) 10.21 Assume we have a demand-paged memory. The page table is held in...
8. (5 points) 10.21 Assume we have a demand-paged memory. The page table is held in registers. It takes 8 milliseconds to service a page fault if an empty page is available or the replaced page is not modified, and 20 if the replaced page is modified. Memory access time is 100 nanoseconds. Assume that the page to be replaced is modified 70 percent of the time. What is the maximum acceptable page- fault rate for an effective access time...
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...
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...
A system has RAM access time of 10 ns, and average page fault service time of...
A system has RAM access time of 10 ns, and average page fault service time of 50 ms. If page faults occur in 2% of all accesses, what is the Mean Effective Access Time? (In ns)
page faults service time is 20 ms and a memory access time of 50 ns. Calculate the effective access time.
page faults service time is 20 ms and a memory access time of 50 ns. Calculate the effective access time.
Suppose you’re given there is a memory access timeof 356 nanoseconds and an average page-fault servicetime...
Suppose you’re given there is a memory access timeof 356 nanoseconds and an average page-fault servicetime of 5milliseconds.a.If one access out of 100causes a page fault, what will be the Effective Access Time? b.How does this compare to main memory access time?
Question 17 5 pts Assume we have primary memory access time of 82 nanoseconds, and a...
Question 17 5 pts Assume we have primary memory access time of 82 nanoseconds, and a solid state disk with which memory access time on a swap is 107 microseconds. Compute the effective memory access time at a 0.07 page fault rate. Give your answer in nanoseconds using numbers only, and to two decimal places if necessary. Question 18 5 pts Assume we have primary memory access time of 96 nanoseconds, and a magnetic fixed disk with which memory access...
Problem 4 (13 points) Assume we have a demand-paged memory. Assume that the time needed to access the page table is negligible. It requires 8 milliseconds to handle a page fault if an empty page is available or the replaced page is not dirty, and 20 milliseconds if the replaced page is dirty. Memory access time is 100 nanoseconds. Assume that the page to be replaced is dirty 70 percent of the time. What is the maximum acceptable page-fault rate...
8. (5 points) 10.21 Assume we have a demand-paged memory. The page table is held in registers. It takes 8 milliseconds to service a page fault if an empty page is available or the replaced page is not modified, and 20 if the replaced page is modified. Memory access time is 100 nanoseconds. Assume that the page to be replaced is modified 70 percent of the time. What is the maximum acceptable page- fault rate for an effective access time...
Question 17 5 pts Assume we have primary memory access time of 82 nanoseconds, and a solid state disk with which memory access time on a swap is 107 microseconds. Compute the effective memory access time at a 0.07 page fault rate. Give your answer in nanoseconds using numbers only, and to two decimal places if necessary. Question 18 5 pts Assume we have primary memory access time of 96 nanoseconds, and a magnetic fixed disk with which memory access...
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