[mythtv-users] Graphite theme slow in "Watch Recordings"

[Michael T. Dean]

On 10/08/2009 01:36 PM, Jim Stichnoth wrote:
> On Thu, Oct 8, 2009 at 10:07 AM, Michael T. Dean wrote:
>   
>> On 10/08/2009 10:17 AM, Jim Stichnoth wrote:
>>     
>>> I see something similar, except that for me, Graphite and mythbuntu
>>> are slow, and metallurgy and blue-abstract are fast, when moving
>>> between recorded programs.  It doesn't matter whether I use the QT or
>>> OpenGL painter.
>>>
>>> I watched the output of "top" while this was happening on the slow
>>> themes.  Each time I moved to a different recording, the mythbackend
>>> process would pop up.  I think it's being used to regenerate a preview
>>> image for the recording, and apparently it's either not caching the
>>> preview image, or not recognizing that the preview image is already
>>> cached.
>>>       
>> Chances are you need to fix your system clocks.  Look for the big warning
>> about differing times in your frontend log file.
>>     
> What --verbose setting would I need to see these warnings?
>   

You'll get a warning at important level if the master backend's clock 
time is >20s different from that of the local host:

Warning! Time difference between the master backend and this system is 
<X> seconds

Note that you may still have problems with image caching even if you 
have >0 but <20 seconds time difference.

> Another related question.  I saw some discussion of putting image
> loading in a separate thread so that the UI doesn't hang while the
> image is loaded.  Yet this doesn't seem to be happening for these
> preview images.  Even in the "fast" themes where moving between
> recorded items is quick, there is still a 1-2 second delay on my
> system, during which the UI is unresponsive, when mythbackend does
> first-time generation of the preview image.  Is that the expected
> behavior?

Make sure you're on current (top-of-tree) trunk--and make sure you're 
actually running that version (i.e. if it seems it's not doing what it's 
supposed to, you may have old libs getting in the way).

And, you do need to fix caching problems before it will work properly.  
See, also, my last message about NFS mounting.

Mike