Consider a demand-paging system with a paging disk that has an average access/transfer time of50 ms. Addresses are translated through a page table in main memory, with an access time of 500ns 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 ifthe page-table entry is in the TLB. Assume that 80% of the accesses are in the TLB and that, ofthose remaining, 15% (or 3% of the total) cause page faults. We assume that the TLB access timeis 20 ns. What is the effective access time?

In any system that uses demand paging, the operating system copies a disk page into physical memory…

Answered: Consider a demand-paging system with a…

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 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?
please no chatgpt answer . 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 percent of the accesses are in the associative memory and that, of those remaining, 10 percent (or 2 percent of the total) cause page faults. What is the effective memory access time? Consider the following page reference string: 1, 2, 3, 4, 2, 1, 5, 6, 2, 1, 2, 3, 7, 6, 3, 2, 1, 2, 3, 6. Assuming demand paging with four frames, Show which pages are resident under the LRU, FIFO, and Optimal replacement algorithms by filling out the following tables. How many page faults would occur…
Question 18 Suppose we have a byte-addressable computer using 2-way set associative mapping with 16-bit main memory addresses and 32 blocks of cache. Suppose also that each block contains 8 bytes. The size of the block offset field is bits, the bits. size of the set field is bits, and the size of the tag hield is
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.
Suppose we have a byte-addressable computer using 2-way set associative mapping with 16-bit main memory addresses and 32 bits, the blocks of cache. Suppose also that each block contains 8 bytes. The size of the block offset field is bits, and the size of the tag field is bits. size of the set field is
Create a memory mapping from the cache memory of 512 MB to the main memory of 4 GB using the four-way set associative approach with a block size of 1 MB. Consider that each memory location may be accessed using a byte address.
A computer uses virtual memory, and a new solid-state drive (SSD) as space for paging. Refer to the last ppt file. In the case presented there, the hard disk drive (HDD) required 25 ms to read in a page, and a rate of 1 page fault per 1000 references introduced a 250 slowdown. If the SSD offers a time of only 80 µs, what is the slowdown in performance caused by 1 pf per 1000 references (you are not concerned with dirty vs. clean pages). What is the maximum rate of page faults you can accept if you want no more than a 5% slowdown in execution using virtual memory? Know your metric prefixes and symbols for time: s for seconds, ms for milliseconds, µs for microseconds, ns for nanoseconds.
Consider a paging system with the page table stored in memory. Memory access takes 200 nanoseconds. If we add associative registers (a TLB), and 75 percent of all page table references are found in associative registers, then the effective memory reference time is__ns Assume that finding a page-table entry in the TLB takes zero time.
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
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.)
Let's pretend for a moment that we have a byte-addressable computer with fully associative mapping, 16-bit main memory addresses, and 32 blocks of cache memory. The following holds true if each block is 16 bits in size: a) Determine how many bytes the offset field is. Measure the tag field's width and height in pixels (b).
A disk has a capacity of two tera-byte size. Say the file system uses a multi-level inode structure for locating the data blocks of afile.The inode stores pointers to data blocks, including a single indirect block, a double indirect block, and several direct blocks in the 64 B of available space.Now, it is given that the disk has a block size of 512 B. The maximum file size that can be stored in such a file system in MB (round off upto 2 decimal places).

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