Re: add speed limit to dd tool

[Davide Brini]

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.