Computer ScienceWhich of these is NOT a likely benefit of demand paging in avirtual memory system?Less physical memory is needed to run all processes.O Less CPU is spent in memory management.O Less I/O is incurred.O More processes can run simultaneously.Assume that we have demand-paged virtual memory withsingle-level paging and that the page-table is stored inmemory. The probability of a TLB hit is 90%. The probabilityfor a page-fault is 0.1%. It is given that the page to be replacedis dirty twenty percent of the time. What is the probabilitythat a memory reference leads to a TLB miss but not a pagefault?O 89.1%O 9.0%O 9.9%O 50%Consider a system where a PTE contains both the referencedand modified bits represented as . Fora page replacement algorithm that employs enhanced secondchance, which of these combinations represent the bestcandidate for page replacement?O <0,0>O <0,1>O<1,0>O 50%Consider a system where a PTE contains both the referencedand modified bits represented as . Fora page replacement algorithm that employs enhanced secondchance, which of these combinations represent the bestcandidate for page replacement?O <0,0>O <0,1>O <1,0 >O<1,1 >please help me with these guestionsOOOO

You have given multiple questions in a single image and according to bartleby policy we are allowed…

Which of these is NOT a likely benefit of demand paging in a virtual memory system? Less physical memory is needed to run all processes. O Less CPU is spent in memory management. O Less I/O is incurred. O More processes can run simultaneously.

Which of these is NOT a likely benefit of demand paging in a virtual memory system? Less physical memory is needed to run all processes. O Less CPU is spent in memory management. O Less I/O is incurred. O More processes can run simultaneously.

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

See similar textbooks

Similar questions

In this exercise, we will examine space/time optimizations for page tables. The following list provides parameters of a virtual memory system. Virtual Address (bits) Physical DRAMInstalled Page Size PTE Size (byte) 43 16 GiB 4 KiB 4 For a single-level page table, how many page table entries (PTEs) are needed? How much physical memory is needed for storing the page table? Using a multilevel page table can reduce the physical memory consumption of page tables, by only keeping active PTEs in physical memory. How many levels of page tables will be needed in this case? And how many memory references are needed for address translation if missing in TLB? An inverted page table can be used to further optimize space and time. How many PTEs are needed to store the page table? Assuming a hash table implementation, what are the common case and worst case numbers of memory references needed for servicing a TLB miss?
A byte-addressable system with 16-bit addresses ships with a three-way set associative, write-backcache (i.e., each block needs a dirty bit). The cache implements a true LRU replacement policy usingthe minimum number of replacement policy bits necessary to implement it, which means it requires 3bits per set. The tag store requires a total of 264 bits of storage. What is the block size of the cache?(Hint: 264 = 2^8 + 2^3 and please also do not forget that aside from the tag itself, each block needs 1valid bit, 1 dirty bit).
NO PLAGARISM Assume that a main memory with only 4 frames each of 16 bytes is initially empty. The CPU generates the following sequence of virtual addresses and uses the Optimal Page replacement policy. 0,4,8,20,24,36,44,12,68,72,80,84,28,32,88,92 Your task is to find out the followings: a. How many page faults does this sequence cause? b. What are the page numbers of the pages which are present in the main memory at the end of the sequence? Assume that it is a byte addressable system.
In the working set model, the idea is to examine the most recent delta page referances. It is also known as an approximation of the Program's Locality. If the total demand is greater than the total number of available frames (D>m) then it will cause thrashing, because in this case, some processes will not have enough frames. Below you see 3 processes and their excepted memory references during their execution. When will the thrashing happen to occur according to the working set model? Assume total memory(m) is 10 and Delta is 5
An operating system uses a Least Recently Used, optimal and also FIFO page replacement algorithm. Consider the following page reference ordering (pages are referenced from left to right): 1, 9, 1, 6, 9, 2, 6, 2, 1, 9, 0. Compute the hit ratio, miss ratio and number of page faults that are generated for all the three algorithms assuming that the process has been allocated four page frames, and that initially, none of the pages are in the main memory.
Using snoopy MSI cache coherence protocol and given a table of three processes with time, how can I display each cache line and figure out what state it is in on every cycle if three professor are executing code that is interleaved? In the table there are just processes with LW and SW. Example: LW R8, 3(R1) Given: 128kbytes cache line block size. 8KB Direct mapped Cache
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…
Thefollowing page addresses, in the given sequence,were generated by a program: 1 8 3 4 8 1 5 6 8 1 8 3 7 6 3 8 1 8 3 6 Calculate the page faults using below page replacementalgorithms for memory with3 and 5 framesseparately. Assume that the main memory is empty initially. (a) LRU (b) FIFO (c) Optimal Page Replacement (d) Which is the most efficient among them and why?
Take into account the following scenario: we have a byte-addressable computer with 2-way set associative mapping, 16-bit main memory addresses, and 32 blocks of cache memory. Since there are 8 bytes in a block, you can use that information to calculate how big the offset field has to be.
Answer 4, 5 and 6 only !! ( NO PLAGARISM) Assume the following scenario for multi-level paging used by a process that has following: a. Logical Address = 64 bits b. Page size = 1 M Byte c. Page table entry size = 4 Byte d. System is byte addressable. calculate the following. 1. Logical Address Space? 2. Maximum number of page table entries in a single page? 3. How many levels of page table entries will be used? 4. Compute the size of page tables at each level? 5. Compute the number of entries in a single page? 6. Compute the number of pages
suppose that a disk drive has 200 tracks, numbered 0 to 199. The drive is currently serving a request at track 50, and the previous request was at track 20. The queue of pending requests, in FIFO order is, 95, 180, 34,119,11,123,62,64. Starting from the current head position, what is the total distance (in tracks) that the disk arm moves to satisfy all the pending requests, for each of the following disk scheduling algorithms? a. FCFS: b. SSTF
Given an O/S which has divided all of main memory into 3 frames; if this O/S uses the LRU algorithm for page replacement/swapping, then how many page faults are generated if the following sequence of pages being accessed by the running process (show your work): 7 0 1 2 0 3 0 4 2 3 0 3 2