[mythtv] CVS CPU usage
davatar at comcast.net
Sat Feb 21 22:14:53 EST 2004
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 -
> 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
> Servatis a periculum, servatis a maleficum - Whisper, Evanescence
> -----BEGIN PGP SIGNATURE-----
> Version: GnuPG v1.2.3 (GNU/Linux)
> Comment: Public key available at http://www.nexusuk.org/pubkey.txt
> -----END PGP SIGNATURE-----
mythtv-dev mailing list
mythtv-dev at mythtv.org
More information about the mythtv-dev