Given 6 memory partitions of 230 KB, 790 KB, 120 KB, 600 KB, 335 KB and 540 KB (in order). How would the first-fit, best-fit and worst - first algorithms place processes of size 210 KB, 20 KB, 195 KB, 100 KB, 200 KB and 125 KB (in order)? Indicate which-if any-requests cannot be satisfied. Comment on how efficiently each of the algorithms manages memory.

Given 6 memory partitions of 230 KB, 790 KB, 120 KB, 600 KB, 335 KB and 540 KB (in order). How would the first-fit, best-fit and worst - first algorithms place processes of size 210 KB, 20 KB, 195 KB, 100 KB, 200 KB and 125 KB (in order)? Indicate which-if any-requests cannot be satisfied. Comment on how efficiently each of the algorithms manages memory.

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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Transcribed Image Text Consider the following set of processes, with arrival times and the length of the CPU burst time given in milliseconds. a. Draw a Gantt chart that illustrates the execution of these processes using the Shortest-Remaining Time First (SRTF) scheduling algorithm. b. Give the average waiting time of Shortest-Remaining Time First (SRTF) scheduling algorithm. Note: Preempted processes are added to the end of the ready queue. Process Arrival Time Burst Time A 4 B 1 3 1 D 3 4 3
Consider the swapping system below with the memory blocks in the following order. Assume that the following segment requests arrive in the order given 13K 10K 5K 9K consider the following as our memory block: 12K 4K 8K 16K 9K 5K 12K 17K 19K Which blocks will be taken for the above requests for the algorithms we covered in the class. Fit the above requests for (i) first fit, (ii) best fit, and (iii) worst fit. Provide your answers step by step for each of these algorithms. For example, for First fit, create a section in your report where you will have the block sequence with the block highlighted per request. Once the block is selected for a request, also indicate remaining capacity of the blocks on the right (e.g., if the request (a) is 4K and the first fit finds the first block (i.e., 12K), then highlight the block with 12K for option (a) and write your answer 8K as the remaining block capacity.
Consider a memory of size 8KB (8192 bytes) that allows dynamic, variable sized partitioning among processes and uses a linked list to keep track of free spaces (hereafter referred to as the free list) in the memory at any given time. Assume that there are 6 processes and assume that their memory size requirements (in bytes) are as given below: Р1: 500, Р2: 600, Р3: 1300, Р4: 2000, Р5: 100, Р6: 200 Assume that the initial state of the free list is as shown below (BA is the base address and Sz is the size of each free space): ВА: 0; Sz: 1100 — ВА: 1200; Sz: 600 > BА: 2000; Sz: 1800> ВА: 6000%; Sz 400
Given 6 memory partitions of 230 KB, 790 KB, 120 KB, 600 KB, 335 KB and 540 KB (in order). How would the first-fit, best-fit and worst - first algorithms place processes of size 210 KB, 20 KB, 195 KB, 100 KB, 200 KB and 125 KB (in order)? Indicate which-if any-requests cannot be satisfied. Comment on how efficiently each of the algorithms manages memory. P
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…
2 Recall the various deadlock detection and prevention algorithms we've discussed in class and consider the following snapshot of a system with five processes (P10, P11, P12, P13, P14) and four resources (R1, R2, R3, R4). R1, R2, R3, and R4 have a total of 11, 13, 7, and 9 resources, respectively. There are no current outstanding queued unsatisfied requests. Table 1: Allocation Table 2: Max R3 R4 PID R.1 R2 R3 R4 PID R1 10 4 11 3 12 1 215 2 1 3 10 13 0 5 0 14 1 3012 4 11 12 012 1 13 1 14 231323 75524 R2 5 5 432300 36373 8 Is the system currently in a safe or unsafe state? If safe, provide the process execution order. If unsafe explain your answer.
Consider a processor that uses a 48-bit virtual memory address. The main memory installed onthe system is 4GB. Page size is set to be 32KB. Determine the following:I. Address space of virtual memory and physical memory. II. Total Number of virtual pages and the total physical pagesIII. How many bits are necessary to store (i) Page Table entry and (ii) TLB entry, consideringthe TLB entry stores valid, reference and dirty bits.IV. What is the size of the page table? And how many pages of memory is needed to storethe entire Page table? What fraction of physical memory is needed to store the entirepage table?
Another placement algorithm for dynamic partitioning is referred to as worst-fit. In this case, the largest free block of memory is used for bringing in a process. Discuss the pros and cons of this method compared to first-, next-, and best-fit. What is the average length of the search for worst-fit?
Suppose that a multiprogrammed system has a load of N processes with individual execution times of t1, t2, ...,tN. Answer the following questions: a) How would it be possible that the time to complete the N processes could be as small as: maximum (t1, t2, ...,tN)? b) How would it be possible that the total execution time, T > t1+ t2+ ...+tN? In other words, what would cause the total execution time to exceed the sum of individual process execution times?
Consider the following set of 5 processes, with the length of the CPU-burst time given in milliseconds arriving at time 0: P1, P2, P3, P4, and P5 with corresponding burst time: 20, 47, 13, 17 and 22. The processes are assumed to have arrived in the order P1, P2, P3, P4, P5, all at time 0. a. Calculate average waiting time for First Come First Serve and None Preemptive Shortest Job First CPU scheduling algorithms. b. Which of the schedules in part a results in the minimal average waiting time (over all processes)?
The memory management process employs virtual memory to make up for the lack of memory space; this process sometimes results in a page fault. Consider the following sequence of page references 01230140 1 2 3 4 Determine how many page faults will occur for the Least Recently Used and First in First Out algorithms, assuming there are only 3 physical page frames, and both are initially invalid. *Note: Please put your answer in the table. You can use the same table with both algorithm, separate by blank row. Put answer for LRU first (top) followed by FIFO B I *Note: Please put your answer in the table. You can use the same table for both algorithm, separate by blank row. Put answer for LRU first (top) followed by FIFO 1 A▾ E E % S E LRU and FIFO