1.What is the average time to read or write a 256-byte sector for a typeical
disk rotating at 7200 PRM ?
The advertised average seek time is 8 ms,the transfer rate is 1 MB/sec.
Assume that the disk is idle so that there is no waiting time.
2.Assume that any individual program spends 40% of its time waiting for I/O
operations to be completed.
What percentage of time is the processor doing useful work (called processor
utilization) if there are three programs loaded into memory ? How many
programs should we keep in memory if we want processor unilization to be at
least 90%?
請問版友這兩題如何算
可以教導一下嗎?
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