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

Which of the following commands will only provide a snapshot of average memory usage for a process？（）

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？（）

Which of the following tools should be used to display the location of unused physical partitions on a disk drive？（）

Which of the following commands should be used to identify packet sequence problems？（）

Which of the following logical volume placement policies is likely to give the best performance in most cases， all other factors being equal？（）

Page replacements algorithm steals file pages only when percent of RAM occupied by filepages（）

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？（）

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？（）

A system administrator increases the mbuf pool allocation， then runs vmstat. It is noticed that the paging rate has not decreased. What is the most effective option to maintain the mbuf pool and decrease paging？（）