[mythtv-users] Strange backend activity

gkanis at cems.umn.edu gkanis at cems.umn.edu
Mon Mar 1 14:21:05 EST 2004


For my system (P4 2.4), mythbackened takes about 60% of the CPU during 
recording,


On Monday 01 March 2004 12:08 pm, Adam Biskobing wrote:
> A little bit more information, I've been watching my backend today
> trying to see when and where it starts eating up the CPU.  I scheduled a
> recording at 11:30, it was running fine eating up 2% of the cpu, until
> the end of the recording, where a mythbackend process with a nice level
> of 19 started to eat up 49-50% of the CPU, memory usage appears to be
> static.  Is this normal?  Any idea what this process is doing?  I've
> scheduled another recording to begin at 12:30 to see what happens when
> it tries to do that recording.
>
> > -----Original Message-----
> > From: mythtv-users-bounces at mythtv.org
> > [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of jose rubio
> > Sent: Saturday, February 28, 2004 5:54 PM
> > To: Discussion about mythtv
> > Subject: Re: [mythtv-users] Strange backend activity
> >
> > On Sat, 2004-02-28 at 04:33, Adam Biskobing wrote:
> > > Chaintech Motherboard
> > > Athlon XP 2000 Processor
> > > 256MB Memory
> > > 80GB & 120GB IDE Discs
> > > PVR-250
> > > Gentoo Linux
> > > Running CVS as of last week
> > >
> > > The problem started with version .13, continued into .14
> >
> > and also into
> >
> > > the CVS.  As I came down this morning, I notice that it had done it
> > > again, The only entries in the backend log were:
> > >
> > > 2004-02-28 08:45:02 Started recording "The Sting" on
> >
> > channel: 1526 on
> >
> > > cardid: 1,
> > >  sourceid 1
> > > 2004-02-28 08:45:02 External channel change:
> > > /usr/share/mythtv/channel/rca.pl 52 6 &
> > > 2004-02-28 08:45:02 Changing from None to RecordingOnly
> > > 2004-02-28 08:45:02 Using profile 'Default' to record
> > > Starting up as the master server.
> > > 2004-02-28 09:17:24 Probed: /dev/video0 - Composite 0
> > > 2004-02-28 09:17:24 Probed: /dev/video0 - Composite 1
> > > 2004-02-28 09:17:24 Probed: /dev/video0 - Composite 2
> > > 2004-02-28 09:17:24 Probed: /dev/video0 - Composite 3
> > >
> > > Any help would be greatly appreciated.  I'm out of ideas,
> >
> > and this is
> >
> > > really cutting into the usability of myth.
> >
> > OK, just a shot in the dark here.  I'm assuming you are
> > running ivtv 0.1.9...  But I don't think it's an ivtv problem
> > if it is the backend running up the cpu.
> >
> > Looking at your log, I'm curious why you get the msg
> > "Starting up as the master server" in the middle of the log
> > when it should be at the begining.  Unless you restarted the
> > server between 8:45 and 9:17. (did
> > you?)
> >
> > If not I do not see why myth would be probing for input in
> > the middle of recording.
> >
> > I did a grep -r "Probed" * in the myth source tree to see
> > where that msg was coming from (I have never gotten that in
> > my logs).  It seems to be only when using v4l2.  Do you have
> > your kernel patched with v4l2 or did you just use the header
> > in the ivtv/utils directory?
> >
> > This could be the diff, I am _not_ using v4l2, just the header...
> >
> > Anyway, if you did not restart the backend at about 9:00 then
> > try compiling a new kernel without v4l2... I told you it was
> > a shot in the dark...
> >
> >
> > Well I hope I was of some help.
> >
> >
> >
> > -jose-



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