vmstat命令

vmstat命令解释：查看所有CPU的平均信息；查看cpu队列信息；
vmstat是将如下三个文件信息读取计算并显示
/proc/meminfo
/proc/stat
/proc/*/stat

# vmstat -h
usage: vmstat [-V] [-n] [delay [count]]
          -V prints version.      # 显示版本
          -n causes the headers not to be reprinted regularly.   # 只显示一次头部信息(终端一直刷新信息，填满终端窗口时，终端将不在打印头部)
          -a print inactive/active page stats.    # 打印活动，不活动统计信息
          -d prints disk statistics      # 磁盘统计
          -D prints disk table      # 磁盘表信息
          -p prints disk partition statistics     # 磁盘分区统计信息
          -s prints vm table       # 内存表信息
          -m prints slabinfo       # cache信息
          -t add timestamp to output     # 打印信息，输出时间戳
          -S unit size      # 输出信息的单位，k,K,m,M
          delay is the delay between updates in seconds.   # 每隔时间显示
          unit size k:1000 K:1024 m:1000000 M:1048576 (default is K)
          count is the number of updates.    # 显示次数

vmstat显示

~]# vmstat -n 1 5 -t 
procs -memory- -swap- -io- -system- -cpu- -timestamp-
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0      0 642692  11800 125248    0    0    23     7   34   46  0  0 100  0  0   2017-04-28 13:38:39 CST
....
procs:
    r: The number of processes waiting for run time.  # 等待运行的进程数
    b: The number of processes in uninterruptible sleep.  # 未中断睡眠的进程数
memory:
    swpd: the amount of virtual memory used.    # 虚拟内存使用量
    free: the amount of idle memory.    # 空间内存量
    buff: the amount of memory used as buffers.    # 内存缓冲区使用量
    cache: the amount of memory used as cache.    # 内存缓存区使用量
    inact: the amount of inactive memory. (-a option)   # 非活动内存量
    active: the amount of active memory. (-a option)   # 活动内存量
swap:
    si: Amount of memory swapped in from disk (/s).  # 从磁盘交换到交换分区数量
    so: Amount of memory swapped to disk (/s).   # 交换分区交换到磁盘的数量
io:
    bi: Blocks received from a block device (blocks/s).   # 从块设备收到的块
    bo: Blocks sent to a block device (blocks/s).   # 发送到块设备的块
system:
    in: The number of interrupts per second, including the clock.   # 每秒中断次数
    cs: The number of context switches per second.     #每秒上下文切换次数
cpu:These are percentages of total CPU time.
    us: Time spent running non-kernel code. (user time, including nice time)     # 用户进程消耗CPU时间的(百分比)
    sy: Time spent running kernel code. (system time)    # 内核进程消耗CPU时间(百分比)
    id: Time spent idle. Prior to Linux 2.5.41, this includes IO-wait time.    # CPU处于空间时间(百分比)，包括IO等待时间
    wa: Time spent waiting for IO. Prior to Linux 2.5.41, included in idle.      # IO等待消耗CPU的时间
    st: Time stolen from a virtual machine. Prior to Linux 2.6.11, unknown.   # 从虚拟机偷取的时间

vmstat -d 显示磁盘统计信息