[mythtv] Re: Slow scheduling >1 min, causes timeouts

Kyle Mestery kmestery at comcast.net
Wed Apr 14 19:43:57 EDT 2004


FYI, my problem turned out to be something with the kernel
I was running on this system. Once I downgraded to my
previous kernel, things started running fine again.

Very strange...


On Tue, 13 Apr 2004, Kyle Mestery wrote:

> I should clarify my comments, when I said things die when remote
> clients connect, I meant they hang, and I either have to kill
> them, or wait 3-5 minutes for the frontend to receive my key
> press.
>
> I've tried restarting the backend, frontend, and myslqd to no
> avail, either. mysql usage goes down significantly when I kill
> or exit the frontend, and things do return to normal ... until
> the next frontend connects.
>
> Kyle
>
> On Tue, 13 Apr 2004, Kyle Mestery wrote:
>
> > I am seeing the same behaviour as Mark has indicated below,
> > with CVS from 04-12-2004, 8PM CST. I cannot get any remote
> > clients to connect the backend, things just die. THis started
> > happening about the same time as Mark indicates for me, and
> > I have not had time to report it until now.
> >
> > I've done an strace on the frontend process, and it's getting
> > EAGAIN on some reads, presumably from the network.
> >
> > Versions of software:
> >
> > RedHat 9
> > Kernel 2.4.20-30_37.rh9.at
> > Mysql 3.23.58
> >
> > Kyle
> >
> > --------------
> > I searched gossamer and didn't see much relevant to my situation.
> >
> > For the past week Myth has been much slower than normal to complete
> > scheduling. I.E. setting a program to record / not record. What used
> > to be nearly instanteous is now causing timeouts in mythweb /
> > mythfrontend. During this time the mythbackend and mysql processes
> > are taking up 100% CPU. I'm running current CVS (mythbackend
> > version: 0.15.20040324-1) compiled in debug mode just in case a crash
> > happened, but none has so far.
> > Originally it took 4-5 min. to complete each schedule change, while
> > watching the -v all output I noticed it was always pausing longer just
> > before listing 'Friends'. So I looked at the 'record' table and
> > noticied two odd rows there.
> > Friends - had chanid=NULL, starttime and endtime=00:00:00, startdate
> > and enddate were either NULL or all zeros (don't remember).
> > and a blank row that had the same set of blanks/nulls as Friends. The
> > title/subtitle/description were all blank for this last row.
> >
> > Since these didn't look right to me, I deleted both rows and added
> > Friends back in through mythfrontend.
> > After that change it only takes a minute to make any scheduling
> > changes, but this is still enough to timeout mythweb and mythfrontend.
> > All the values in record seem to be sane (no unusual NULLs or zeros).
> >
> > Any recommendations on what's causing the slowdown, or what I could
> > look at to fix it?
> > running:
> > Redhat 9
> > kernel 2.4.20
> > mysql-3.23.58-1.9
> > I don't remember upgrading any packages when this started happening.
> >
> > Thanks in advance,
> >
> > Mark
> >
> >
>
> --
>


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