iotop

iotop命令是专门显示硬盘IO的命令,界面风格类似top命令。这个命令只有在kernelv2.6.20及以后的版本中才有。

只显示io的进程pid

iotop -oP

install

1

yum install iotop

参数

-o, -only

Only show processes or threads actually doing I/O, instead of showing all processes or threads. This can be dynamically toggled by pressing o.

-b, -batch

Turn on non-interactive mode. Useful for logging I/O usage over time.

-n NUM, -iter=NUM

Set the number of iterations before quitting (never quit by default). This is most useful in non-interactive mode.

-d SEC, -delay=SEC

Set the delay between iterations in seconds (1 second by default). Accepts non-integer values such as 1.1 seconds.

-p PID, -pid=PID

A list of processes/threads to monitor (all by default).

-u USER, -user=USER

A list of users to monitor (all by default)

-P, -processes

Only show processes. Normally iotop shows all threads.

-a, -accumulated

Show accumulated I/O instead of bandwidth. In this mode, iotop shows the amount of I/O processes have done since iotop started.

-k, -kilobytes

Use kilobytes instead of a human friendly unit. This mode is useful when scripting the batch mode of iotop. Instead of choosing the most appropriate unit iotop will dis‐

play all sizes in kilobytes.

-t, -time

Add a timestamp on each line (implies -batch). Each line will be prefixed by the current time.

-q, -quiet

suppress some lines of header (implies -batch). This option can be specified up to three times to remove header lines.

-q column names are only printed on the first iteration,

-qq column names are never printed,

-qqq the I/O summary is never printed.

使用截图

1

iotop -o

快捷键

  • 左右箭头改变排序方式,默认是按IO排序
  • r 反向排序
  • o 是只显示有IO输出的进程
  • q 退出

系统级的 IO 使用

[[iostat#iostat]]