单项选择题

Which of the following commands should be used to monitor the number of bytes read on any given disk？（）

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

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单项选择题

Which of the following statements is TRUE concerning the po column of the vmstat command？（）

A. The sys is high when po is high.
B. The po represents the number of page steals.
C. The low values usually indicate insufficient paging space.
D. The low values usually indicate sufficient memory for the load.

单项选择题

While monitoring a system using vmstat， which of the following options most likely indicates that the system is CPU bound？（）

A. r is greater than 40
B. id is greater than 50
C. sum of id and wa equals 50
D. sum of us and sy equals 100

单项选择题

A typical example of a process # 19082 in the /proc file would be：
# ls -l /proc/19082
total 0
dr-xr-xr-x 1 root system 0 Sep 15 15：12 .
dr-xr-xr-x 1 root system 0 Sept 15 15：12 ..
-rw------- 1 root system 0 Sept 15 15：12 as
-r-------- 1 root system 128 Sept 15 15：12 cred
--w------- 1 root system 0 Sept 15 15：12 ctl
dr-xr-xr-x 1 root system 0 Sept 15 15：12 lwp
-r-------- 1 root system 0 Sept 15 15：12 map
dr-x------ 1 root system 0 Sept 15 15：12 object
-r--r--r-- 1 root system 448 Sept 15 15：12 psinfo
-r-------- 1 root system 1024 Sept 15 15：12 sigact
-r-------- 1 root system 1520 Sept 15 15：12 status
-r--r--r-- 1 root system 0 Sept 15 15：12 sysent
Writing to which of the following files will allow the owner to stop a process？（）

A. status
B. sysent
C. ctl
D. as