Re: Making nice niser for system hogging programs

[Con Kolivas <kernel@kolivas.org>]

On Sun, 2 Oct 2005 12:26, Marc Perkel wrote:
> Just a thought -----
>
> Programs like cp -a /bigdir /backup and rsync usually bring the server
> to a crawl no matter how much "nice" you put on them. Is there any way
> to make "nice" smarter in that it limits io as well as processor usage?
> If cp and rsyne ran a little slower IO wise then everything else could
> run too.

The latest cfq io scheduler supports io nice levels. By default it links the 
io nice levels to the cpu nice levels so if you use cfq and set your file 
commands nice 19 they will use as little io priority as possible. Note this 
only works on the read side but that makes a dramatic difference already.

Cheers
Con

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