Homework 1: Device management Due date: June 14, in class. Turn in the hard copy. 1. Suppose three processes, P1, P2 and P3 are running concurrently on a machine, and they are accessing the same device D. Only one process can use the device or the processor at a same time (although the device and the processor can be simultaneously in use by different processes). Suppose that the device and computation times for these processes are as follows: P1 t_compute = 20 t_device = 50 P2 t_compute = 30 t_device = 10 P3 t_compute = 15 t_device = 35 a) Assume that the device uses polling based I/O. What is the minimum amount of time required to execute the processes? Discuss. b) What about in the case of interrupt driven I/O? 2. Read the review of the newest Seagate Barracuda harddrive at Tom's Hardware: http://www6.tomshardware.com/storage/20040209/index.html Summarize the findings in about 500 words, and explain the benchmark results. (The purpose of this homework is to learn how to read articles evaluating the performance of the peripheral devices). 3. Research on the internet the topic of the recordable DVD formats. Write an essay of about 500 words and explain the similarities and differences between the DVD-R, DVD-RW, DVD+R, DVD+RW and DVD-RAM formats. One possible starting point is the DVD FAQ: http://www.dvddemystified.com/dvdfaq.html