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

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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

单项选择题

In an iostat report， which of the following options best describes the value of % iowait？（）

A. The amount of time taken to service an I/O interrupt
B. The percentage of time CPU（s） are waiting for page ins
C. The percentage of time the CPU9（s） are waiting on network
D. The percentage of time the CPU（s） are waiting for outstanding disk I/O requests

单项选择题

Which of the following commands should be used to determine DNS name resolution performance？（）

A. iptrace
B. vmstat
C. hostname
D. ifconfig