Linux 下的I/O性能分析 iotop

Linux has always been able to show how much I/O was going on (the bi and bo columns of the vmstat 1 command).

Iotop is a Python program with a top like UI used to show of behalf of which process is the I/O going on. It requires Python ≥ 2.5 (or Python ≥ 2.4 with the ctypes module) and a Linux kernel ≥ 2.6.20 with the TASK_DELAY_ACCT CONFIG_TASKSTATS, TASK_IO_ACCOUNTING and CONFIG_VM_EVENT_COUNTERS options on.

Download

Iotop is licensed under the terms of the GNU GPL.

The latest version is Iotop 0.4.2 (NEWS), available here: iotop-0.4.2.tar.bz2 or iotop-0.4.2.tar.gz.

RPMS: iotop-0.4.2-1.noarch.rpm or iotop-0.4.2-1.src.rpm.

Freshmeat project page to stay informed: http://freshmeat.net/projects/iotop.

Git repository hosted on repo.or.cz. To get a snapshot of iotop with a complete history, use the following command:

git clone git://repo.or.cz/iotop.git 

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Linux下的IO统计工具如iostat, nmon等大多数是只能统计到per设备的读写情况, 如果你想知道每个进程是如何使用IO的就比较麻烦.
当然如果你会systemtap, 或者blktrace这些事情难不到你, 但是没专用工具总不是很舒服的. 幸运的是Linux 2.6.20内核以后提供了基于每个进程的IO记账功能,所以就有了类似iotop这样方便的工具.

官网地址: http://guichaz.free.fr/iotop/

Iotop is a Python program with a top like UI used to show of behalf of which process is the I/O going on.

在RHEL6或者ubuntu下使用就非常简单, 我简单的演示下ubuntu10下使用:
安装先:
$ apt-get install iotop

直接运行就好:
$iotop

 

 

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下面来说一具体运用：

 

可以用左右箭头操作，按 r 是相反方向，按 o 是动态切换

用法 iotop -参数

–version 查看版本信息的

-h, –help 查看帮助信息的

-o, –only 只显示在划硬盘的程序
-b, –batch 批量处理 用来记录日志的

-n NUM  设定循环几次

-d SEC, –delay=SEC  设定显示时间间隔

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