[mythtv] Watching Live TV & method TV::GetChannelInfo getting called every second

Buechler, Mark R Mark_R_Buechler at bausch.com
Thu Jul 15 14:37:55 EDT 2004

The problem is you don't want it cached and at the same time update every
second - what would be the point? You would only be as up to date as your
cache which could be several seconds off. Maybe a better way would be to on
every channel change pull in 2 (or more) hours of information and only check
again after 2 hours for updates. Then you could update at the times when the
schedule changes.
- Mark.


From: Tako Schotanus [mailto:quintesse at palacio-cristal.com] 
Sent: Thursday, July 15, 2004 2:10 PM
To: Development of mythtv
Subject: Re: [mythtv] Watching Live TV & method TV::GetChannelInfo getting
called every second

Isaac Richards wrote: 

On Thursday 15 July 2004 12:43 pm, Buechler, Mark R wrote:


Admittedly, I'm working with a two day old copy of CVS but I've seen this

for a few weeks now. I see on my backend mysqld running at 45-55% CPU and

the frontend taking more CPU than it should as well. I tracked it down to a

SQL statement running every second getting channel information while

watching live TV.

I was wondering if anyone might know why


LCD info updater.  I didn't realize it was going every second, I'll bump it

a lot, or actually, now that I look at this, I don't think it's thread safe 

at all..


Sorry, had no idea that GetChannelInfo would hit the database so much.
It did this every second so you could see program info changes while
watching live tv.

So now I've got two questions because I really want this to work (and I'm
not the only one for sure).

1. Is there a way to get this channel information without hitting the
database so much? (Is there a function that does local caching of the
results for eample?)

2. Why isn't it thread-safe? I tried to model the LCD code as much as
possible on the OSD code thinking that if it was okay to update the OSD it
would probably be okay to update the LCD as well. But if you can tell me
where/how it can go wrong I'll fix it (or at least try to).


Bausch & Lomb
150 Years of Perfecting Vision, Enhancing Life (TM)


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