[mythtv-users] Backend settings for max simultaneous jobs and cpu usage

[steve]

On 12/28/2011 12:25 PM, Jim Stichnoth wrote:
> On Wed, Dec 28, 2011 at 9:28 AM, steve<networks1 at cox.net>  wrote:
>> Greetings and happy holidays.  I am looking for advice on how to choose
>> settings for Max simultaneous jobs and CPU usage on the backend setup.
>> I have a Core 2 Duo E8400 3ghz processor, and want to make best use of
>> it.  But I have looked around the wiki and done some searches on this,
>> and am not turning up much.  What are the principles for selecting
>> settings for two these options?
> In addition to Mike Dean's general advice, here's my own personal
> experience.  My backend has a Core 2 Duo E5200 @ 2.5GHz.  I have it
> configured to allow 3 simultaneous jobs, at the "Medium" CPU setting.
> The reasoning is that (at least for MPEG-2 recordings) commflagging
> proceeds significantly faster than realtime, so when commflagging
> starts concurrently with the recording, it ends up not using all of
> the CPU.  I have never seen any problems with this setting and I have
> probably had it this way for 2 years.  The other observation is that
> often enough, I have 3 recordings at the same time, so allowing 3
> simultaneous jobs allows some amount of fairness to the commflagging.
> (This would be a lot less of an issue with the smart job queue that
> Mike mentioned.)
>
> One thing, though.  If you are in the habit of doing lossless
> transcoding, you may want to be careful about allowing more than one
> of these at a time, as they are extremely I/O bound and can interfere
> with a recording happening at the same time.  The backend setup
> doesn't let you restrict jobs according to job type.
>
> Jim
> _______________________________________________
>
Thanks to both of you.  Assuming there is consensus on this advice, I 
think I will add it into the wiki, because like I said it's really not 
discussed in there.

Steve