单选题
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？（） 
发布日期：2021-01-28
There is a file I/O bottleneck.
There are too many open files.
There appears to be a buffer shortage.
There is a paging space I/O bottleneck.
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