单项选择题

Which of the following commands is most useful in initially collecting data to determine a network performance problem？（）

A. ping
B. trace
C. ifconfig
D. lsattr

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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 should be drawn about the I O bottleneck？（）

A. There is a file I/O bottleneck.
B. There are too many open files.
C. There appears to be a buffer shortage.
D. There is a paging space I/O bottleneck.

单项选择题

WhichofthefollowingmetricsprovidedbytheiostatreportisusedtoinitiallydetermineifasystemisI Obound？（）

A. % idle
B. % sys
C. % user
D. % iowait