[mythtv-users] Switching between backends?

Eni Gma enigma at thedonnerparty.com
Sun Apr 20 03:35:17 UTC 2003


Check your X logs to make sure X is using xv to play the video and not xsm

-----Original Message-----
From: mythtv-users-bounces at snowman.net
[mailto:mythtv-users-bounces at snowman.net] On Behalf Of Wally Wallace
Sent: Friday, April 18, 2003 9:13 PM
To: mythtv-users at snowman.net
Subject: [mythtv-users] can we all get together and figure out cpu usage -
Please respond

For the common good-
Following these lists for the past few months I have noticed
dramatically different results in cpu usage with mythtv. Some people
seem to run myth fine without maxing their cpu's and other people using
almost the same exact hardware have serious cpu issues. Unfortunately I
fall into the second category. I think I echo the thoughts of many on
this list by saying "What the hell!!!"

So can we get together and figure it out in this thread and I will throw
the results up on the web in a database if there is enough interest.

One thing I am very curious about. Are people who are saying mythtv is
using only %30-40 reading top correctly? When I watch livetv I tend to
have 5-10 mythbackend threads and 4 or 5 mythfrontend threads. Now this
is what I think - those that report low cpu usage aren't reporting total
cpu usage they are just reporting usage in the first thread in the list.
This is just a guess based on my experience with high end
hardware. Please report total cpu usage. Note- I am assuming no one is
compiling a kernel while using myth or running any cpu intensive tasks.

Would everyone plz submit their systems and idle
cpu from top sorta like as follows: 
Livetv - 720x480 RTJPEG - cpu idle ~ %7
Livetv- 640x480 Mpeg4 HQ(high quality) 3300,2,15,2- cpu idle %2-10
prerecorded - 640x480Mpeg4 HQ(high quality)3300,2,15,2- cpu idle
%75

System:
Athlon XP 2100+ overlocked to 2.1ghz
asus k7v266
512mb pc2100
hauppage wintv 401 w/ btaudio
geforce2mx 32mb
running debian sid X 4.2.1
200mb drivezilla 280/50 hdparm dma enabled

Now for the frontend:
Livetv or playback of mpeg4 640x480 - 0% idle AHHH!
Livetv or playback of mpeg4 480x480 - 2% idle AHHH!
The problem here is that X on my frontend uses 30-50% cpu and I don't
know why.

Specs:
Celeron 1.2
pcchips M758lmr+
sis 630 chipset with shared agp video
256mb pc100
HD used only for bootup then turned off
Debian Sid
I have tried both X 4.2.1 and 4.3 and both onboard video and ati rage128
video, both support xv and both give 30%-50% cpu during playback in
myth, but work fine with mplayer playing dvd's and divx.  Again, "What
the hell!!!"

Final idea - I am not much of a c++ guy - though myth is prompting me to
learn more. Could we make some sort of performance debug plugin that
will record myth performance and output it to a text file along with a
list of system specs for easy submission to this list or to a website.
After writing that I just realized i could probably just do a perl
script and read the settings from the database so I will do that and
post it soon.
Like I said in the subject please respond so we can figure out the weird
hardware discrepancies. 

Thanks all!
-Wally
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