单项选择题
A. The total CPU usage for this drive
B. The bandwidth utilization of the indicated drive
C. It can best be represented by the equation （%iowait - %ioidle）
D. It can best be represented by the equation （kilobytes read/kilobytes written） *100
单项选择题 Whichofthefollowingcommandsshouldbeusedtomonitortheaveragenumberofthreadsinthescheduler’srunqueueforanygiveninterval？（）
单项选择题 Inordertodeterminehowefficientlyanapplicationisreadingandwritingdata，whichofthefollowingutilitieswillreportreadandwritesizesondiskI/Orequests？（）
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. Using the vmstat output as shown in the exhibit， which of the following conclusions is most appropriate to draw about the I/O bottleneck？（）