一、安装iotop

yum -y install iotop

二、iotop 使用

1、查看帮助

# iotop  -h
Usage: /usr/sbin/iotop [OPTIONS]

DISK READ and DISK WRITE are the block I/O bandwidth used during the sampling
period. SWAPIN and IO are the percentages of time the thread spent respectively
while swapping in and waiting on I/O more generally. PRIO is the I/O priority at
which the thread is running (set using the ionice command).

Controls: left and right arrows to change the sorting column, r to invert the
sorting order, o to toggle the --only option, p to toggle the --processes
option, a to toggle the --accumulated option, q to quit, any other key to force
a refresh.

Options:
  --version             show program's version number and exit
  -h, --help            show this help message and exit
  -o, --only            only show processes or threads actually doing I/O
  -b, --batch           non-interactive mode
  -n NUM, --iter=NUM    number of iterations before ending [infinite]
  -d SEC, --delay=SEC   delay between iterations [1 second]
  -p PID, --pid=PID     processes/threads to monitor [all]
  -u USER, --user=USER  users to monitor [all]
  -P, --processes       only show processes, not all threads
  -a, --accumulated     show accumulated I/O instead of bandwidth
  -k, --kilobytes       use kilobytes instead of a human friendly unit
  -t, --time            add a timestamp on each line (implies --batch)
  -q, --quiet           suppress some lines of header (implies --batch)

2、字段解释

--version #显示版本号
-h, --help #显示帮助信息
-o, --only #显示进程或者线程实际上正在做的I/O，而不是全部的，可以随时切换按o
-b, --batch #运行在非交互式的模式
-n NUM, --iter=NUM #在非交互式模式下，设置显示的次数，
-d SEC, --delay=SEC #设置显示的间隔秒数，支持非整数值
-p PID, --pid=PID #只显示指定PID的信息
-u USER, --user=USER #显示指定的用户的进程的信息
-P, --processes #只显示进程，一般为显示所有的线程
-a, --accumulated #显示从iotop启动后每个线程完成了的IO总数
-k, --kilobytes #以千字节显示
-t, --time #在每一行前添加一个当前的时间
-q, --quiet #suppress some lines of header (implies --batch). This option can be specified up to three times to remove header lines.

3、使用实例

1) 直接查看
iotop

可操作：
    <-  ->  左右移动
    r        反向排序
    o        切换到  --only 模式
    a        切换到  --accumulated 模式 
    p        切换到  --processes 模式
    q        退出