单项选择题 Whichofthefollowingcommandsshouldbeusedtomonitorthenumberofthreadsonthescheduler’srunqueueforanygiveninterval？（）

单项选择题 Whenmonitoringasystemusingvmstatwithaninterval，whichofthefollowingconclusionsshouldbedrawnaboutthemetricsunderpagepiandpagepo？（）

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 is most appropriate to draw about the machine？（）