[mythtv-users] Are there any throttling features in Mythtv?
gull at gull.us
Tue Feb 3 18:12:07 UTC 2009
Mike Perkins wrote:
> Sunday evening, we sat down to watch a film I'd recorded just before
> Christmas, 2 hours long. This was about 7:45 pm. An hour and a half
> later, the whole system hung. There was not the slightest sign that
> anything was wrong up to the point it froze.
> After some investigation of the front end I discovered that the back
> end had hung. This was because at 8:55 pm the back end had begun three
> simultaneous recordings on three DVB-T tuners. Apparently my back end
> couldn't cope with reading and writing four streams simultaneously.
Odd that it would hang instead of stuttering. Are you sure this is an
I/O problem, and not an overheating, memory, or power supply issue?
Have you tried duplicating the hang to make sure it wasn't just
coincidence? Usually running out of disk I/O bandwidth won't hang a
whole system -- if it did just doing a file copy would be enough to kill it.
> Now, before you all scream "throw more hardware at it!" I would like to
> point out that whatever system you've got, a point will come when you
> are likely to stress it. So it occurred to me to wonder if there was any
> kind of throttling or warning available in mythtv, apart from "max # of
> jobs to run on this backend".
I'm not sure I see the point of installing hardware and then telling
Myth not to use it. Wouldn't it make more sense to just not install
more tuners than the system can handle?
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