Re: [gentoo-amd64] PORTAGE_NICENESS

[Richard Freeman <rich@thefreemanclan.net>]

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Mike Doty wrote:
> Mark Knecht wrote:
>> so do I actually use "+19"?
> the latter

Yes, a -19 would certainly make for a VERY unusable system!

I'm running a myth backend and I've found a few useful tricks:

1.  Myth itself is run at nice -10.  This was accomplished by editing 
the init.d script.

2.  Within myth tasks like commercial flagging are set to run niced. 
You don't want myth spawning random tasks running at -10.  Unfortunately 
I can't find a way to do this with mythfilldb (short of writing a 
wrapper script I suppose).

3.  emerge schedutils and setup your block devices to use a scheduler 
which respects IONICEness.

4.  Run mythbackend using ionice -c 1 for realtime scheduling.

5.  I usually run builds with ionice -c 3 nice -n 19.  That results in 
essentially no impact at all on system performance.

Oh, if you run cron jobs I'd avoid setting them to ionice -c 3.  I had 
problems with backups taking multiple days (instead of an hour) to run 
that way.  I guess it depends what your priorities are...

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