sda`s only IO activity in Linux?

Asked Mar 03 '19 at 17:45

Active Mar 03 '19 at 18:14

Viewed 172 times

I am familiar with iotop and those tools. But for some strange reason I have to write a Ruby program on my own to monitor only read and write activity of all the partitions on /dev/sda). I want to know how does iotop work.

I have the Kernel 4.20.13-arch1-1-ARCH

Is there a file that I can read with Ruby's IO.read('somefile') and do some formatting to get the IO details?

For further info, I want to know how does gnome-system-monitor monitor disk IO activities as a non-root user?

edited Mar 03 '19 at 18:14

ctrl-alt-delor

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asked Mar 03 '19 at 17:45

15 Volts

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1

Look at /proc/diskstats – Stephen Harris Mar 03 '19 at 18:00
I just cat /proc/diskstats in a while loop, and I just wrote 1 GiB to the /dev/sda2, and saw the cat output to stdout changes. I think it works, but I don't get the meaning of the outputs. Any documentation? – 15 Volts Mar 03 '19 at 18:06
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Nice, I got it: https://www.kernel.org/doc/Documentation/ABI/testing/procfs-diskstats – 15 Volts Mar 03 '19 at 18:09
I recommend you read source of them. I think gnome-system-monitor uses gvfs: https://wiki.gnome.org/Projects/gvfs – PersianGulf Mar 03 '19 at 18:28

Is there a file that can be used to monitor `/dev/sda`s only IO activity in Linux?

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