1. What is the difference between simple paging and virtual memory paging? 2. Explain thrashing. 3....
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?
Homework Answers
Difference between simple paging and virtual memory paging can be summed on the basis of the pages of a process. In case of simple paging a process holding all the pages need to be in the main memory so that process can be in execution state unless and until overlays have been used. In case of virtual memory paging a process holding all the pages don't need to have all the pages in the main memory so that process can be in execution state the pages can be fetched accordingly when required.
Add Answer to:
1. What is the difference between simple paging and virtual
memory paging?
2. Explain thrashing.
3....
Translation lookaside buffer What other components within virtual memory work with the TLB and Page table?
Translation lookaside buffer What other components within virtual memory work with the TLB and Page table?
The virtual memory system using demand paging, also provides memory protection. · Explain clearly (and briefly) how...
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.
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...
Please answer the following questions about paged memory... A) How much space needs to be allocated...
Please answer the following questions about paged memory... A) How much space needs to be allocated in the minimum and maximum cases for a two-level page table for a machine with a 32-bit virtual memory address, a 1K page size, and which has four times as many inner pages as outer pages? Assume any stored page table value requires 32 bits. B) For the two-level paging approach above, if a Translation Lookaside Buffer (TLB) is used and can cache both...
A simple paging system has a memory size of 256 bytes and a page size of...
A simple paging system has a memory size of 256 bytes and a page size of 16 bytes. i. What is the size of the page table? ii. How many bits exist for an address, assuming 1-byte incremental addressing? iii. State p and d values (i.e. the page number and the offset). iv. Perform address translation of 64 bytes to physical address space using the page table below. 0 8 1 6 2 3 3 11 4 7
A simple paging system has a memory size of 256 bytes and a page size of...
A simple paging system has a memory size of 256 bytes and a page size of 16 bytes. i. What is the size of the page table? ii. How many bits exist for an address, assuming 1-byte incremental addressing? iii. State p and d values (i.e. the page number and the offset). iv. Perform address translation of 64 bytes to physical address space using the page table below. 0 8 1 6 2 3 3 11 4 7
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.
1. Consider a simple paging system with the following parameters: 232 bytes of physical memory; page...
1. Consider a simple paging system with the following parameters: 232 bytes of physical memory; page size of 210 bytes; 216 pages of logical address space. How many bits are in a logical address? How many bytes are in a frame! How many bits in the physical address specify the frame? How many entries are in the page table? How many bits are in each page table entry? Assume each page table entry contains a valid/invalid bit. 2. Consider a...
3. Virtual Memory (20 points) An ISA supports an 8 bit, byte-addressable virtual address space. The...
3. Virtual Memory (20 points) An ISA supports an 8 bit, byte-addressable virtual address space. The corresponding physical memory has only 256 bytes. Each page contains 32 bytes. A simple, one-level translation scheme is used and the page table resides in physical memory. The initial contents of the frames of physical memory are shown below. VALUE address size 8 bit byte addressable each byte of addressing type memory has its own address 32 B page size physical memory size 256...
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.
1. Consider a simple paging system with the following parameters: 232 bytes of physical memory; page size of 210 bytes; 216 pages of logical address space. How many bits are in a logical address? How many bytes are in a frame! How many bits in the physical address specify the frame? How many entries are in the page table? How many bits are in each page table entry? Assume each page table entry contains a valid/invalid bit. 2. Consider a...
3. Virtual Memory (20 points) An ISA supports an 8 bit, byte-addressable virtual address space. The corresponding physical memory has only 256 bytes. Each page contains 32 bytes. A simple, one-level translation scheme is used and the page table resides in physical memory. The initial contents of the frames of physical memory are shown below. VALUE address size 8 bit byte addressable each byte of addressing type memory has its own address 32 B page size physical memory size 256...
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