unfortunately, ionice has only 3 levels. awesome, regular, and crappy. if
you just push down the backuppc io process then EVERYTHING will pre-empt the
IO, if you up it, it will consume every drop of blood from the system!
note, you should NEVER ionice a heavy IO process such as backuppc to -c1,
the backup will take all the IO priority and you could litterally not be
able to log in or run any programs because the shell wont be able to get
enough IO time to search $PATH for commands or read .profile,.bashrc, etc
etc to get a user logged in.
On Fri, Mar 28, 2008 at 2:43 AM, Tino Schwarze <[EMAIL PROTECTED]>
wrote:
> On Thu, Mar 27, 2008 at 11:27:25PM -0600, Daniel Denson wrote:
>
> > not really. IO is not CPU bound and nicing a process only changes its
> > CPU usage priority (on linux 2.6)
> >
> > Now, if you have a processes eating up 100% of the CPU, renicing a
> > processes that uses heavy IO *can* have an effect as the program using
> > all the IO could gain(or loose) the ability to get to the CPU in a
> > timely manner.
>
> I don't think that this should be a problem. IO is handled by the
> kernel. The process is stuck until the kernel finishes IO. When kernel
> finished IO, it doesn't care whether the process will pick up the
> results now or sometime later. That's at least what I _assume_ to
> happen, I don't know for sure.
>
> > generally speaking though, renicing and IO bound task wont make any
> > difference
>
> You could try ionice to lower the IO impact...
>
> HTH,
>
> Tino.
>
> --
> www.craniosacralzentrum.de
> www.spiritualdesign-chemnitz.de
> www.forteego.de
>
> Tino Schwarze * Lortzingstraße 21 * 09119 Chemnitz
>
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