(b) Consider a paging system with the page table stored in memory. If a memory reference takes 200 nano seconds, how long does a paged memory reference take? If we add a TLB, and 75% of all page references are found in the TLB, what is the effective memory reference time? (Assume that it takes zero time to find an entry in the TLB if it is already present).

(b) Consider a paging system with the page table stored in memory. If a memory reference takes 200 nano seconds, how long does a paged memory reference take? If we add a TLB, and 75% of all page references are found in the TLB, what is the effective memory reference time? (Assume that it takes zero time to find an entry in the TLB if it is already present).

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter12: Secondary Storage Management

Section: Chapter Questions

Problem 12VE

See similar textbooks

Similar questions

Consider a paging system with the page table stored in memory.a. If a memory reference takes 400 nanoseconds, how long does a paged memoryreference take?b. If we add TLBs, and 95 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 inthe TLBs takes zero time, if the entry is there.)
(a) Explain the use of TLBs to improve paging efficiency. (b) Consider a paging system with the page table stored in memory. If a memory reference takes 200 nano seconds, how long does a paged memory reference take? If we add a TLB, and 75% of all page references are found in the TLB, what is the effective memory reference time? (Assume that it takes zero time to find an entry in the TLB if it is already present). (In operating system)
Consider a paging system with the page table stored in memory. a. If a memory reference takes 50 nanoseconds, how long does a paged memory reference take? b. If we add TLBS, and if 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 in the TLBS takes 2 nanoseconds, if the entry is present.
I am trying to better understand memory access in computers, please answer the sample question below. Assume that the page table can held in registers of the MMU. It takes 8 ms (milliseconds)to service a page fault if there is an empty frame or if the replaced page is not altered, and20 ms if the replaced page is altered. Memory access time is 100 ns (nanoseconds). It has been empirically measured that the page to be replaced is altered 75% of the time.Obtain the maximum probability of page fault for an effective memory access time ≤ 200ns.
Consider a paging system with the page table stored in memory. A. If a memory reference takes 200 nanoseconds, how long does a paged memory reference take? B. 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.)
Consider a demand-paging system with a paging disk that has an average access and transfer time of 25 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 75 percent of the accesses are in the associative memory and that, of those remaining, 10 percent (or 2.5 percent of the total) cause page faults. What is the effective memory access time?
Consider a demand-paging system with a paging disk that has an average access/transfer time of 50 ms. Addresses are translated through a page table in main memory, with an access time of 500 ns per memory access. Thus, each memory reference through the page table takes two accesses. To improve this time, we have added a TLB that reduces access time to one memory reference if the page-table entry is in the TLB. Assume that 80% of the accesses are in the TLB and that, of those remaining, 15% (or 3% of the total) cause page faults. We assume that the TLB access time is 20 ns. What is the effective access time?
A paging scheme uses a Translation Look-aside Buffer (TLB). A TLB-access takes 10 ns and a main memory access takes 50 ns. The effective access time(in ns) is_?(if the TLB hit ratio is 90% and there is no page-fault)
Recently, a computer system was designed by Adam. He considered a paging system assured with a page table stored up in the memory. It was observed that when he used the associative registers, the references made to page tables were around 80 percent. During the whole process, the memory reference taken was about 150 ns. Adam was not sure what was the time taken for paged memory reference. Your task is to help Adam to compute the time for paged memory reference and the time taken for effective memory reference.
For our byte-addressable computer, we opted for a fully associative mapping that allows for 32 cache memory blocks and 16 bits for main memory addresses. If the size of each block is 16 bits, then the following is correct:Find out how many bytes the offset field takes up (a).(B) Measure the size of the tag field in pixels.
4. Given that the main memory size is 32KB, the page size is 64B, the word size is 1B, and n-level paging is applied. What is the page number size? If (5, 10) is a record in the outer page table stored in PCB and (9, 7) is a record in the inter page table stored in page frame No.10, what is the physical address of the logical address 0010101001000110 in HEX?
On a simple paging system with 224 bytes of physical memory, 256 pages of logical address space, and a page size of 210 bytes. 1. How many bits are needed to store an entry in the page table (how wide is the page table)? Assume a valid/invalid 1-bit is included in each entry. 2. If the page table is stored in the main memory with 250nsec access time, how long does a paged memory reference take? 3. If the page table is implemented using associative registers that takes 95nsec. and main memory that takes 200nsec, what is the total access time if 75% of all memory references find their entries in the associative registers?