[mythtv-users] RE: mythtv processes not showing up in top.

Mike Benoit ipso at snappymail.ca
Tue Aug 17 17:06:25 EDT 2004

I have two WinTV2000 cards, which do not do onboard encoding. I also
have MythTV set to do mpeg4 encoding, and before I did the "major"
upgrade, mythbackend and mythfrontend processes both showed up in top,
and used the majority of CPU on the box. Obviously only when I was
recording/watching, or flagging commercials of course though.

For instance, right now my system has a load of 2.70, top shows 34%
userspace usage, 66% idle, and the when sorting the processes by CPU
usage, top itself is number 1, with 0.8% usage. So obviously other
userspace processes are using CPU that top isn't showing me. And in this
case it can only be mythbackend using the majority.

On Tue, 2004-08-17 at 13:20 -0700, Cedric Tefft wrote:
> >Yeah, mythbackend shows up, it just says its not using any CPU, when it
> >obviously is.
> >
> >
> >  
> >
> Not necessarily.  If your capture card's creating the MPEG stream (like 
> the Hauppauge PVRx50 cards), there shouldn't be much load on your CPU. 
> My backend's been running for about 12 hours and even after recording a 
> two-hour movie still shows 0:00 accumulated processor time on the actual 
> mythbackend process. In fact, if  my myth box is just recording a show 
> (not displaying it), top shows the CPU at 98% idle.   The real 
> CPU-intensive process (in my system anyway) is the X server (233:39 
> accumulated CPU over the last 2 days), but even that only runs hot when 
> I'm actually watching something with the frontend. The frontend process 
> shows only 0:06 accumulated processor time in the same 12 hours.
> Doesn't really explain what's going on in your situation, but the 
> assumption that mythbackend has to use lots of CPU to record isn't 
> necessarily correct.
> - Cedric
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Mike Benoit <ipso at snappymail.ca>

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