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？（）
单项选择题 Whichofthefollowingtoolsshouldbeusedtoreportin-depthinformationaboutfilefragments？（）
单项选择题 Whichofthefollowingperformancetoolscanbeusedtodetermineifasystemisthrashing？（）
