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.

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Iotop is licensed under the terms of the .

The latest version is Iotop 0.4.2 (), available here: or .

RPMS: or .

Freshmeat project page to stay informed: .

hosted on . 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統計工具如iostat, nmon等大多數是隻能統計到per裝置的讀寫情況, 如果你想知道每個程式是如何使用IO的就比較麻煩.
當然如果你會systemtap, 或者blktrace這些事情難不到你, 但是沒專用工具總不是很舒服的. 幸運的是Linux 2.6.20核心以後提供了基於每個程式的IO記賬功能,所以就有了類似iotop這樣方便的工具.

官網地址:

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下使用就非常簡單, 我簡單的演示下ubuntu10下使用:
安裝先:
$ apt-get install iotop

直接執行就好:
$iotop

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下面來說一具體運用：

可以用左右箭頭操作，按 r 是相反方向，按 o 是動態切換

用法 iotop -引數

–version 檢視版本資訊的

-h, –help 檢視幫助資訊的

-o, –only 只顯示在劃硬碟的程式
-b, –batch 批次處理用來記錄日誌的

-n NUM 設定迴圈幾次

-d SEC, –delay=SEC 設定顯示時間間隔

Linux 下的I/O效能分析 iotop

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