Consider a computer system with 6 tape drives and 'n' processes completing for them. What is the maximum value of 'n' for the system to be deadlock free? (Assuming that each processes may need 3 tape drives) a. 3 b. 2 c. 4 d. 7
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| 38. | Consider a computer system with 6 tape drives and 'n' processes completing for them. What is the maximum value of 'n' for the system to be deadlock free? (Assuming that each processes may need 3 tape drives) |
| a. | 3 |
| b. | 2 |
| c. | 4 |
| d. | 7 |
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- 110. A system has 12 magnetic tape drives and 3 processes : P0, P1, and P2. Process P0 requires 10 tape drives, P1 requires 4 and P2 requires 9 tape drives.Process P0 P1 P2 Maximum needs (process-wise : P0 through P2 top to bottom) 10 4 9Currently allocated (process-wise)522Which of the following sequence is a safe sequence ? a. P0, P1, P2 b. P1, P2, P0 c. P2, P0, P1 d. P1, P0, P2Consider a demand-paged computer system where the degree of multiprogramming is currently fixed at seven. The system was recently measured to determine utilization of the CPU and the paging disk. Three alternative results are shown below. For each case, what is happening? Can the degree of multiprogramming be increased to increase the CPU utilization? Is the paging helping? Justify.a. CPU utilization 10 percent; disk utilization 95 percentb. CPU utilization 95 percent; disk utilization 1 percentc. CPU utilization 10 percent; disk utilization 5 percenConsider a program that performs the following steps repeatedly: Use the CPU for 4 milliseconds. By issuing an I/O, use the disk for 14 milliseconds. Use the CPU for 10 milliseconds. By issuing an I/O, use network for 18 milliseconds. Assume that each step depends on data obtained from the previous step (e.g., step 3 cannot start before step 2 is completed. Also assume that each resource (CPU or disk or network) can be used by one process at a time. Answer the following questions: (a) Draw 3 time-line diagrams (horizontal axis is the time line; one line for each resource. That is, 3 parallel rows in the resulted figure.) that illustrate the utilizations of the CPU, disk, and network over the execution of two iterations of the program above by a single process. (b) What are the average utilizations of the CPU, disk and network over these two iterations? (Please note that the “total time” should be the same across all resources, from the entire system starts until all work on any…
- Consider a disk drive specifications. with the following 16 surfaces, 512 tracks/surface, 512 sectors/ track, 1 KB/sector, rotation speed 3000 rpm. The disk is operated in cycle stealing mode whereby whenever one byte word is ready it is sent to memory; similarly, for writing, the disk interface reads a 4 byte word from the memory in each DMA cycle. Memory cycle time is 40 nsec. The maximum percentage of time that the CPU gets blocked during DMA operation?Consider the following set of processes, with the length of the CPU burst given in milliseconds Draw the Gantt Chart and calculate the Waiting time and the turnaround time. Upload the solution as a fileSuppose that you currently have a computer system with the following two characteristics:There are only three components that determine the overall performance — CPU, memory, and disk.For any given computation, the system spends 30% of the time for CPU, 40% of the time for memory,and 30% of the time for disk. Now suppose that you want to purchase a new system that improves theperformance in the following ways:The memory performance is 4 times faster over your current system, the disk performance is 5 timesfaster over your current system and everything else is the same. Using Amdahl’s Law, calculate theoverall speedup of the new system over your current system.
- There are four processes which are going to share nine tape drives. Their current and maximum number of allocation numbers are as follows : process current maximum p1 3 6 P2 1 2 P3 4 9 P4 0 2 a. Is the system in a safe state? Why ? Find the safe sequence. b. Is the system deadlocked? Why or why not?6. A computer system has 6 tape drives, with 'n' processes competing for them. Each process may need 3 tape drives. The maximum value of 'n' for which the system is guaranteed to be deadlock free is a. 4 b. 3 c. 2 d. 1Which of the following entities in the Von Neumann model corresponds to which component: flash memory, DVD-RW, ROM, hard disk, and microprocessor?
- How does memory affect the performance of the machine, in terms of a.) whether memory is available to the machine or not and b.) if available, how it is accessed (LIFO vs. Random Access)? Elaborate on the effect on the power of the machine and why this is the case? Provide some examples to support your argument.Suppose the processing load of a computing system consists of 50% disk activity, 25% CPU activity, and 25% other IO activity. Your customers are complaining that the system is slow. After research, you discover that you can upgrade your disks and make them 2 times faster than they currently are. You also discovered you can upgrade your CPU to make it 3 times faster than it currently is. Further, you find a way of boosting the other IO operations by a factor of 5. Assuming you have time to implement only one of these enhancements, which one would you choose if you want to achieve the maximum speedup. Show your work.A Von Neumann model includes which of the following elements: flash memory, DVD-RW, ROM, hard disc, and microprocessor?