Which of the following commands should be used to monitor the average number of threads in the scheduler’s run queue for any given interval？（）

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

单项选择题Whichofthefollowingcommandsshouldbeusedtotuneparametersofdevicesthataredisplayedwithlsattr？（）

A. chdev
B. cfgmgr
C. vmtune
D. schedtune

单项选择题Whichofthefollowingcommandsshouldbeusedtoidentifypacketsequenceproblems？（）

A. ping and arp
B. lsattr and ifconfig
C. netstat and iostat
D. iptrace and tcpdump