单项选择题

Which of the following commands will only provide a snapshot of average memory usage for a process？（）

A. vmtune
B. ps au
C. iostat
D. rmss -m

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单项选择题

Which of the following commands should be used to monitor the number of threads on the scheduler’s run queue for any given interval？（）

A. sar
B. pstat
C. iostat
D. filemon

单项选择题

When monitoring a system using vmstat with an interval， which of the following conclusions should be drawn about the metrics under page pi and page po？（）

A. The values do not include working storage.
B. The values do not include persistent storage.
C. The values include both persistent and working storage.
D. The values are not working or persistent storage.

单项选择题

To examine the Exhibit， press the Exhibit button. While a user is compiling a C program， "vmstat 120 10" is run to determine the cause of a performance problem. Given 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.