Operating Systems, computer science homework help

Operating Systems, computer science homework help

1. Given the speeds listed in Fig. 5-1, is it possible to scan documents from a scanner and transmit them over an 802.11g network at full speed? Defend your answer.

2. Explain the tradeoffs between precise and imprecise interrupts on a superscalar machine.

3. In which of the four I/O software layers is each of the following done. (a) Computing the track, sector, and head for a disk read. (b) Writing commands to the device registers.(c) Checking to see if the user is permitted to use the device. (d) Converting binary integers to ASCII for printing.

4. Why are output files for the printer normally spooled on disk before being printed?

5. How many pebibytes are there in a zebibyte?

6. Disk requests come in to the disk driver for cylinders 10, 22, 20, 2, 40, 6, and 38, in that order. A seek takes 6 msec per cylinder. How much seek time is needed for (a) First-come, first served. (b) Closest cylinder next. (c) Elevator algorithm (initially moving upward). In all cases, the arm is initially at cylinder 20.

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