On Wed, Sep 02, 2009 at 12:24:09PM -0400, Jon Craig wrote:

> > I tried renicing everything:
> >
> > jeward@kw157:/usr/share/backuppc/bin$ head -2 BackupPC_nightly
> > #!/usr/bin/perl
> > setpriority(0, $$, -20);
> >
> > jeward@kw157:/usr/share/backuppc/bin$ head -2 BackupPC_dump
> > #!/usr/bin/perl
> > setpriority(0, $$, 20);
> >
> 
> I believe that BackupPC_nightly is running as "backuppc" user and as
> such can only reduce it priority (ie +20), not lower (ie -20).  Also,
> you should check that the sub-processes to see if they properly
> inherited this change.  My guess is it will still not have much affect
> as your most likely IO bound and priority affects scheduling on the
> processor, but doesn't prioritize IO.

It might be worth a try to use ionice as well and have either the
nightly or the dump set to idle priority (ionice -c3 -p$pid)

Tino.

-- 
"What we nourish flourishes." - "Was wir nähren erblüht."

www.lichtkreis-chemnitz.de
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