Re: add speed limit to dd tool (original) (raw)

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From: Davide Brini
Subject: Re: add speed limit to dd tool
Date: Mon, 10 Sep 2012 18:57:16 +0200

On Mon, 10 Sep 2012 14:32:14 +1100, address@hidden wrote:

Hi

Just a suggestion that it woild be good idea to have speed limit in dd tool so one can use it to for example spare network bandwidth when copying file like this:

cat file | dd --limit-speed 1M | nc 10.0.0.1 10000

or spare drive's load copying file like this:

dd if=/mnt/sda1/file of=/mnt/sda2/file --limit-speed 10M

There is tool "cstream" that similar to "dd" one can use it to copy file locally:

cstream -i /mnt/sda1/file -o /mnt/sda2/file -t 10m

or remotely:

cstream -o /tmp/file host:port -t 100k

but its not under GPL license:

"The license is similar to the X consortium license"

The speed limit shouldve been added to dd at the very begining it will make it even more useful.

You can use a tool named "pv" (available in all the distros I've worked with) to put a bandwidth limit on any operation that involves streams or pipes, just insert it where you want the throttling to happen, eg

dd if=file | pv --rate-limit 1m | nc etc.

-- D.