Challenge Question One On a system with paging, a process cannot access memory that it does...
Challenge Question One
On a system with paging, a process cannot access memory that
it
does not own. Why? How could the operating system allow
access
to other memory? Why should it or should it not?
Challenge Question Two
What is the purpose of paging the page tables?
Homework Answers
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Challenge Question One
On a system with paging, a process cannot access memory that
it
does...
Question from OS In a system that uses paging, a process cannot access memory that belongs...
Question from OS In a system that uses paging, a process cannot access memory that belongs to another process. Why? Why is it theoretically possible with segmentation but not paging?
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...
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...
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)
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
Consider a demand-paging system in which the replacement of a page takes 20 milliseconds (access time...
Consider a demand-paging system in which the replacement of a page takes 20 milliseconds (access time and data transfer). 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, a TLB is added to the system to reduces access time to one memory reference, if the page-table entry is in the associative memory. Assume that...
II. (a) An OS is using two-level paging to implement a 28-bit virtual address space per...
II. (a) An OS is using two-level paging to implement a 28-bit virtual address space per process. The page size is 256-bytes, and the machine does not have a TLB. Explain the steps involved in looking up the virtual address 0x03bf04d, when all pages are present in memory. (2 points) (b) For the system above, what is the maximum number of page faults that could be generated in response to a memory access? (2 points)
Problem 3 (25 points): Consider a paging system with the page table stored in memory. Ifa...
Problem 3 (25 points): Consider a paging system with the page table stored in memory. Ifa memory reference takes 200 nanoseconds, how long does a paged memory reference take? If we add associative registers, and 75 percent of all page-table references are found in the associative registers, what is the effective memory reference time? (Assume that finding a page-table entry in the associative registers takes zero time if the entry is there.) a. b.
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)
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
Problem 3 (25 points): Consider a paging system with the page table stored in memory. Ifa memory reference takes 200 nanoseconds, how long does a paged memory reference take? If we add associative registers, and 75 percent of all page-table references are found in the associative registers, what is the effective memory reference time? (Assume that finding a page-table entry in the associative registers takes zero time if the entry is there.) a. b.
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