You are correct on both counts.

On Sep 2, 2009, at 9:24 AM, Jon Craig wrote:

> On Wed, Sep 2, 2009 at 11:58 AM, James Ward<jeward AT torzo DOT com> 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.
> --  
> Jonathan Craig
>
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