单项选择题
After running the vmstat command， which of the following would most likely cause the value in the blocked column to be unusually high？（）
A. Kernel thread
B. Too many users
C. Memory shortage
D. Network contention
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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？（）
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