单项选择题

Which of the following commands will reset NFS options to their defaults？（）

A. nfso -d
B. nfso -c
C. startsrc -g nfs -d
D. startsrc -g nfs -r

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单项选择题

To examine the Exhibit， press the Exhibit button. While a developer is compiling a C program， "vmstat 120 10" is run to determine the cause of a performance problem. Using the vmstat output as shown in the exhibit， which of the following conclusions is most appropriate to draw about the machine？（）

A. The machine has too many users.
B. The machine has an I/O bottleneck.
C. The machine has a CPU bottleneck.
D. The machine has a memory bottleneck.

单项选择题

Which of the following commands should be used to monitor the number of bytes read on any given disk？（）

A. tprof
B. topas
C. filemon
D. vmstat

单项选择题

Which of the following statements is TRUE concerning the po column of the vmstat command？（）

A. The sys is high when po is high.
B. The po represents the number of page steals.
C. The low values usually indicate insufficient paging space.
D. The low values usually indicate sufficient memory for the load.