IBM(000-234)单项选择题每日一练(2019.01.12)

单项选择题
The rmss command provides the facility to run an application over a range of memory sizes and display the performance statistics. How is the simulated memory reset to the real memory of the machine？（）
A. rmss -c
B. rmss -p
C. rmss -r
D. rmss -s
单项选择题
Which of the following commands should be used to determine which disk of a system is experiencing a disk I/O performance problem？（）
A. filemon
B. istat
C. vmstat
D. iostat
单项选择题
A TCP/IP application is transferring files from a personal machine to a remote machine. The application writes 32 kilobytes of data at a time to the socket， but has not issued a system call to set the window size. Which of the following procedures should be performed on the personal machine to increase the throughput of the application？（）
A. Increase the size of thewall
B. Increase the size of sb_max
C. Increase the size of tcp_recvspace
D. Increase the size of tcp_sendspace
单项选择题
Which command series should be used to determine whether file paging or paging space paging is a problem when running a program from an idle system？（）
A. foo ； lsps -s
B. tprof -kx ； foo
C. iostat ； foo ； iostat
D. vmstat -s ； foo ； vmstat s
单项选择题
Which of the following performance tools can be used to determine if a system is thrashing？（）
A. svmon and tprof
B. vmtune and schedtune
C. ps and schedtune
D. vmstat and topas