[mythtv] Mythbackend: Large ni CPU usage when idle ?

[Paul Andreassen]

On Tue, 2004-11-02 at 07:59, Terry Barnaby wrote:
> I am running the CVS version (2004-10-28) of the mythbackend on a 1G 
> Celeron system using Fedora 2. The system has two DVB-T cards installed 
> and I am running a couple of Myth clients on separate machines.
> Generally all is working fine. However I have noticed that after viewing
> some recordings the mythbackend box is showing the CPU nice usage to
> be about 56% using "top". The "top" process listing does not show any 
> particular process using the CPU in the %CPU column. If I kill and 
> restart mythbackend nice usage goes down to 0 again until I watch 
> another recording.
> 
> Any ideas on:
> 1. Why is mythbackend using the CPU with nice priority when idle ?
> 2. Why does "top" not show mythbackend using the CPU in %CPU ?

G'day,

I've seen something similar when the mythbackend is doing commercial
flagging.  If you use 'ps auxm' it will show threads related to
processes.  Commercial flagging run with about 50% when set to low
priority and niced at 100% when medium.  I'm not sure of the detail but
you can check the code.  'top' for some reason doesn't show thread
information. (that I know about)

Paul