The virtual memory system using demand paging, also provides memory protection.
· Explain clearly (and briefly) how is protection achieved.
· Show how the paging system determines when a page reference is an illegal page or a page not currently in memory.
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The virtual memory system using demand paging, also provides memory protection. · Explain clearly (and briefly) how...
1. What is the difference between simple paging and virtual memory paging? 2. Explain thrashing. 3. Why is the principle of locality crucial to the use of virtual memory? 4. What elements are typically found in a page table entry? briefly define each element. 5. What is the purpose of translation lookaside buffer?
A certain computer provides its users with a virtual memory space of 2^32 bytes. The computer has 2^18 bytes of physical memory. The virtual memory is implemented by paging, and the page size is 4,096 bytes. A user process generates the virtual address 11123456 hexadecimal. a. How many entries are there in the page table? b. Explain how the system establishes the corresponding physical location.
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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 virtual memory system with the following properties: 36 bit virtual byte address, 8 KB pages size, and 32 bit physical byte address. Please explain how you determined your answer. a. What is the size of main memory for this system if all addressable frames are used? b. What is the total size of the page table for each process on this processor, assuming that the valid, protection, dirty, and use bits take a total of 4 bits and...
4. Assume it take 50 nanoseconds to resolve a memory reference when accessing the physical memory address directly. a) We designed a system using virtual addresses with page tables without a TLB. In other words, when fetching data from memory, the page table is accessed to get the PTE for translating an address, a translation is completed, and finally, a memory reference to the desired data is resolved. In this system, what is the effective memory reference time. Assume the...
1. Consider a demand-paging system with the following time-measured utilizations: CPU utilization 20% Paging disk 5% Other I/O devices 97% Indicate which will improve system utilization and explain your answer. a. Install a faster CPU . b. Install a bigger paging disk. c. Increase the degree of multiprogramming. d. Decrease the degree of multiprogramming. e. Install more main memory. f. Install a faster hard disk or multiple controllers with multiple hard disks. g. Add prepaging to the page-fetch algorithms....
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As described in 5.7, virtual memory uses a page table to track the mapping of virtual addresses to the physical addresses. This exercise shows how this table must be updated as addresses are accessed. The following data constitutes a stream of virtual addresses as seen on a system. Assume 4 KiB pages, a 4-entry fully associative TLB, and true LRU replacement. If pages must be brought in from disk, increment the next largest page number. 4669, 2227, 13916, 34587, 48870,...
Problem 4- Resource Utilization (16 points) Consider a demand-paged computer system using a virtual memory management o do only main memory and disk for paging. Suppose the organization running this system can one of the following actions at the present time: afforn policy for (a) Get a faster CPU (b) Get a faster paging disk (c) Decrease the degree of multiprogramming (d) Increase the degree of multiprogramming m was measured to determine the utilization of the CPU and paging disk....