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 is most appropriate to draw about the machine？（）

单项选择题Inaniostatreport，whichofthefollowingoptionsbestdescribesthevalueof%tm_act？（）

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？（）

A. tprof
B. iostat
C. vmstat
D. filemon

单项选择题Inordertodeterminehowefficientlyanapplicationisreadingandwritingdata，whichofthefollowingutilitieswillreportreadandwritesizesondiskI Orequests？（）

A. tprof
B. iostat
C. svmon
D. filemon

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？（）

A. The bottleneck is network I/O.
B. The bottleneck is local disk I/O.
C. The bottleneck is paging space I/O.
D. The bottleneck is to a remote filesystem.

单项选择题WhichtoolisbasedontheAIXtracefacility？（）

A. no
B. netpmon
C. entstat
D. nfso