[mythtv] CVS CPU usage

[D Banerjee]

I noticed the recording+playing cpu usage was much higher a long time ago,
my conclusion is that it's cache pollution. You may be able to fit an entire
frame in L2 while recording, but you can't fit two. I hope someone proves me
wrong though :) It appears as if mythbackend cpu usage rises, not an even
distribution to frontend.

As far as lately, I believe about two weeks ago the bttv adjust filter was
set to auto-enable. I've had to reduce my bitrate from 2900 to 2200 at
640x480 to be able to record at all. However I don't seem to see any
difference in video quality. If I wasn't on the road I'd double check if
it's actually running/required on my system. Maybe next week.

Try deleting the libadjust.so from your library path and see what happens.


----- Original Message ----- 
From: <steve at nexusuk.org>
To: <mythtv-dev at mythtv.org>
Sent: Saturday, February 21, 2004 6:37 PM
Subject: [mythtv] CVS CPU usage


> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
>
> My previous message about this, sent earlier this evening didn't seem to
> get through to the list:
>
> I just upgraded to the CVS version from 0.14.  Under 0.14 the backend used
> to use about 50 - 60% CPU (MPEG4 encoding from a BTTV card), but now under
> the CVS version I get much more CPU usage in some situations:
>
> - - If there is no encoding happening at all and the frontend is playing a
> video then the backend shows no CPU usage at all (this is good)
> - - When recording and not playing, the backend shows about 55% CPU usage,
> so about the same as before
> - - When recording and playing at the same time, the backend shows 60 -
70%
> CPU usage.  Why is it so much higher than just recording?
> - - When watching LiveTV, the backend uses 65 - 100% CPU, which makes Live
> TV completely unusable.  Why is watching Live TV any different to watching
> and recording at the same time?
> - - When the scheduler recalculates the scheduling, the backend uses 100%
> CPU for a long time (can be 30 seconds or more).  The thread isn't niced
> and causes huge amounts of dropped frames.  This basically means I can't
> change the scheduling at all while recording without making sections of
> the recording unwatchable.  This was also a problem with 0.14 but it seems
> to have gotten worse with the CVS update.
>
> Any help would be appreciated.  Thanks.
>
> - -- 
>
>  - Steve
http://www.nexusuk.org/
>
>      Servatis a periculum, servatis a maleficum - Whisper, Evanescence
>
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