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Official statement:

Linux has always been able to show how much 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 ≥ 2.7 and a Linux kernel ≥ 2.6.20 with the TASK_DELAY_ACCT CONFIG_TASKSTATS, TASK_IO_ACCOUNTING and CONFIG_VM_EVENT_COUNTERS options on.

Iotop installation:

Direct yum installation.

Yum install iotop

The installation command in Ubuntu is: sudo apt-get install iotop

After installation, type: iotop on the terminal.

Or:

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

Instructions for using iotop:

You can use the left and right arrows, press r in the opposite direction, press o to switch dynamically

Usage iotop-Parameter

-version to view version information

-h,-help view help information

-o,-only only shows programs that scratch the hard drive

-b,-batch batch processing is used for logging

-n NUM setting cycle several times

-d SEC,-delay=SEC set the display interval

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