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mccoyn
PostPosted: Thu Dec 23, 2004 8:07 am 
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Joined: Sun Dec 05, 2004 2:20 pm
Posts: 83
Location: Michigan, USA
I tried using mythfrontend this morning and it is very slow. When I finally got it to play something, it would drop most frames. I just had a slide show once every second or so. Here is what top looks like:
Code:
top - 08:40:27 up 14:25,  2 users,  load average: 10.17, 9.84, 6.51
Tasks: 106 total,   2 running, 104 sleeping,   0 stopped,   0 zombie
Cpu(s):   0.8% user,  16.6% system,  72.5% nice,  10.1% idle
Mem:    256524k total,   252644k used,     3880k free,      680k buffers
Swap:  1044216k total,   333124k used,   711092k free,     9636k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  Command

 2620 root      15   0   660  604  428 R 15.2  0.2   0:12.40 top
 1778 mythtv    19  19  243m 215m 210m S  7.7 86.0   5:21.18 mythbackend
 1686 mythtv    19  19  243m 215m 210m S  7.2 86.0   6:29.38 mythbackend
 1877 mythtv    19  19  243m 215m 210m S  6.6 86.0   4:17.04 mythbackend
 2066 mythtv    19  19  243m 215m 210m S  6.6 86.0   3:09.61 mythbackend
 1428 mythtv    19  19  243m 215m 210m S  6.1 86.0  14:12.15 mythbackend
 1975 mythtv    19  19  243m 215m 210m S  5.8 86.0   3:41.29 mythbackend
 2042 mythtv    19  19  243m 215m 210m S  5.8 86.0   3:19.38 mythbackend
 1491 mythtv    19  19  243m 215m 210m S  5.2 86.0   9:41.95 mythbackend
 1577 mythtv    19  19  243m 215m 210m S  5.0 86.0   7:59.42 mythbackend
 1640 mythtv    19  19  243m 215m 210m S  5.0 86.0   7:00.41 mythbackend
 1732 mythtv    19  19  243m 215m 210m S  5.0 86.0   5:14.24 mythbackend
 1927 mythtv    19  19  243m 215m 210m R  4.4 86.0   4:00.29 mythbackend
 1829 mythtv    19  19  243m 215m 210m S  2.5 86.0   4:51.76 mythbackend
 1937 mythtv     9   0  243m 215m 210m S  0.8 86.0   0:03.20 mythbackend
 1438 mythtv     9   0  243m 215m 210m S  0.3 86.0   0:05.61 mythbackend
 2068 mythtv     9   0  243m 215m 210m S  0.3 86.0   0:02.58 mythbackend
    1 root       8   0    52   44   24 S  0.0  0.0   0:04.12 init
    2 root       9   0     0    0    0 S  0.0  0.0   0:00.16 keventd
    3 root      19  19     0    0    0 S  0.0  0.0   0:00.01 ksoftirqd_CPU0
    4 root       9   0     0    0    0 S  0.0  0.0   0:29.32 kswapd
    5 root       9   0     0    0    0 S  0.0  0.0   0:00.00 bdflush
    6 root       9   0     0    0    0 S  0.0  0.0   0:00.02 kupdated
    8 root       9   0     0    0    0 S  0.0  0.0   0:01.12 kjournald
  106 root       9   0     0    0    0 S  0.0  0.0   0:00.00 khubd
  205 root       9   0     0    0    0 S  0.0  0.0   0:12.57 kjournald
  286 root       9   0   232  124  124 S  0.0  0.0   0:00.02 pump
  313 daemon     9   0   136   68   68 S  0.0  0.0   0:00.00 portmap
  429 root       9   0   296  244  244 S  0.0  0.1   0:00.37 syslogd
  444 root       9   0  1036  128  128 S  0.0  0.0   0:00.19 klogd
  500 root       9   0  1132  176  156 S  0.0  0.1   0:00.10 apache
  517 root       9   0   148  104  104 S  0.0  0.0   0:00.00 inetd
  550 root       9   0   260   44   44 S  0.0  0.0   0:00.05 mysqld_safe
  500 root       9   0  1136  180  160 S  0.0  0.1   0:00.10 apache


What stands out is the high nice usage, which I have no idea what it is and the many instances of mythbackend running. Any idea what caused this?

I'll reboot it and that will probally fix it for now. I'll be away from home all next week and I'd like to get this fixed so it doesn't crash causing me to miss a lot of recordings.

My system is a P3 550 MHz with a PVR350 to do most of the work. I've recorded while watching another recording and downloading a third recording to my computer without a problem before.

The most recent change that I made was to downgrade ivtv to 0.2.0 and to change my tuner type to 44 instead of 39. See this thread for details. Last night was the first successful time I've recorded something past channel 61.

mythbackend.log and mythbackend.log.1.gz don't show anything strange.
Here is the end of the messages file. I think it looks normal, but I'm not sure. The rest of the file is just more of the same.
Code:
Dec 23 03:00:04 mythtv kernel: saa7115: decoder set size
Dec 23 03:00:05 mythtv kernel: saa7115: decoder disable output
Dec 23 03:00:05 mythtv kernel: saa7115: decoder enable output
Dec 23 03:14:56 mythtv -- MARK --
Dec 23 03:15:02 mythtv kernel: saa7115: decoder set picture bright=127 contrast=63 saturation=63 hue
=0
Dec 23 03:15:02 mythtv last message repeated 3 times
Dec 23 03:15:02 mythtv kernel: saa7115: decoder disable output
Dec 23 03:15:03 mythtv kernel: saa7115: decoder enable output
Dec 23 03:15:04 mythtv kernel: saa7115: decoder set picture bright=127 contrast=63 saturation=63 hue
=0
Dec 23 03:15:04 mythtv last message repeated 3 times
Dec 23 03:15:04 mythtv kernel: saa7115: decoder set size
Dec 23 03:15:04 mythtv kernel: saa7115: decoder disable output
Dec 23 03:15:04 mythtv kernel: saa7115: decoder enable output
Dec 23 03:34:56 mythtv -- MARK --
Dec 23 03:54:56 mythtv -- MARK --
Dec 23 04:15:00 mythtv -- MARK --
Dec 23 04:35:00 mythtv -- MARK --
Dec 23 04:55:01 mythtv -- MARK --
Dec 23 05:15:01 mythtv -- MARK --
Dec 23 05:35:01 mythtv -- MARK --
Dec 23 05:55:01 mythtv -- MARK --
Dec 23 06:15:01 mythtv -- MARK --
Dec 23 06:33:35 mythtv syslogd 1.4.1#10: restart.
Dec 23 06:55:01 mythtv -- MARK --
Dec 23 07:15:01 mythtv -- MARK --
Dec 23 07:35:01 mythtv -- MARK --
Dec 23 07:55:01 mythtv -- MARK --
Dec 23 08:15:01 mythtv -- MARK --
Dec 23 08:35:05 mythtv -- MARK --
Dec 23 08:55:07 mythtv -- MARK --
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Xsecrets
 Post subject:
PostPosted: Thu Dec 23, 2004 9:11 am 
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Joined: Mon Oct 06, 2003 10:38 am
Posts: 4978
Location: Nashville, TN
well my guess would be that you have commercial flagging turned on. I bet you'll have better luck if you turn it off. It's not like it works anyways.

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tjc
 Post subject:
PostPosted: Thu Dec 23, 2004 11:24 am 
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Joined: Thu Mar 25, 2004 11:00 am
Posts: 9551
Location: Arlington, MA
The only time I've ever had a problem with commercial marking is when I had a corrupted recording or had lost the markers that get put in the DB for the start and end of the stream when it's recorded. In those cases it will tend to run forever at hight CPU usage if you let it.

Other than that it just works. The results aren't always right - very much dependant on the channel - but it runs without any problems. On Cartoon Network (I'm an animation fan) and Sci-Fi (no comment ;-) ) the results are about 90-95% correct and it only takes a few seconds to go through and check/fix the ones that aren't. On other channels the results are mixed. When I recorded the Bourne Identity it did pretty well and about 75% of the marks were right or close to it. For other stuff I've recorded from TNT it's essentially useless.
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Xsecrets
 Post subject:
PostPosted: Thu Dec 23, 2004 11:27 am 
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Joined: Mon Oct 06, 2003 10:38 am
Posts: 4978
Location: Nashville, TN
well I only said that because he has a very weak proc and with mythcomflag running in the background it could easily run him out of proc cycles.

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mccoyn
 Post subject:
PostPosted: Thu Dec 23, 2004 1:00 pm 
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Joined: Sun Dec 05, 2004 2:20 pm
Posts: 83
Location: Michigan, USA
I do have commercial flagging on. It seems to catch 50% on cartoons and 25% on live action shows. It also leaves the last segment of The Daily Show as a commercial. I can turn it off without missing much.

Does commercial flagging have to decode the entire video stream? If thats the case then it makes sense that my proc doesn't stand much of a chance.
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alien
 Post subject:
PostPosted: Wed Jan 12, 2005 8:51 am 
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Joined: Mon Jun 21, 2004 5:28 am
Posts: 700
Location: Germany
Nice isn't a process. It is the % of CPU usage by processes that have a lower priority ("nice" can be used to lower a processes priority). If you look at the NI column, the nice value is given. The >0 NI processes add up to about 72%.

I'm not sure why there are so many mythbackends. I have that too and have often wondered. Maybe several are spawned to handle multiple frontends.

Allen

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Last edited by alien on Thu Jan 13, 2005 1:08 am, edited 1 time in total.
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Greg Frost
 Post subject:
PostPosted: Wed Jan 12, 2005 5:40 pm 
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Joined: Mon May 10, 2004 8:08 pm
Posts: 1891
Location: Adelaide, Australia
I'm guessing that mythbackend is a multi-threaded application. Linux gives each thread a separate process id. This is not the case on some other Unix OSes (such as Tru64 Unix for instance). It makes determining the CPU usage of a single process a pain in the ass because you need to know which threads belong to which process.
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