Please help me with this Operating Systems Principles homework: Q4. Consider a paging system with the page table stored in memory. Answer and explain the following.a. If a memory reference takes 75 nanoseconds, how long does a paged memory reference take?b.If we add TLBs, and if 80 percent of all page-table references are found in the TLBs, what is the effectivememory reference time? (Assume that finding a page-table entry in the TLBs takes 4 ns)

Computer operating systems employ paging, a memory management technique, to control and arrange the…

Answered: Q4. Consider a paging system with the…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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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.)
(b) Consider a paging system with the page table stored in memory. If a memory referencetakes 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 referencetime? (Assume that it takes zero time to find an entry in the TLB if it is already 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.
(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 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?
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.
Consider a memory system that generates 16-bits addresses and the frame size is 32-byte. At time To the status of the page table is given below. Page Table Entry Page # 1911 11 561 56 644 1068 1884 52 58 42 194 46 a) What is the maximum number of entries within a single page/frame? b) What is the maximum number of page table entries in the memory system? c) Using the given page table, determine the physical addresses for the following logical addresses. Write down the physical addresses in binary and decimal format. (i) (iii) 0101000010001011 1110101110010111 (ii) (iv) 0001100001100111 1110111011101001
In a computer with a 32-bit data-bus, how many 4-bit wide memory components are used? the answer to this part is 32/4 = 8 components (2-bit wide) I need the answer to part two, please If the size of each 4-bit memory component is 4 x n cells where n = 1G (i.e., 4 x n uniquely addressable locations-n: row, 4:2 column/width), what is the total capacity of the memory system? Show your answer in power of 2. (hint: 1000 ~ 210)
In a computer with a 32-bit data-bus, how many 4-bit wide memory components are used? the answer to this part is 32/4 = 8 components (2-bit wide) I need the answer to part two, please If the size of each 4-bit memory component is 4 x n cells where n = 1G (i.e., 4 x n uniquely addressable locations—n : row, 4 : 2 column/width), what is the total capacity of the memory system? Show your answer in power of 2. (hint: 1000 ~ 210)
Consider a program that accesses a single I/O device and compare unbuffered I/O to the use of a buffer. Show that the use of the buffer can reduce the running time by at most a factor of two.

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