[mythtv-users] backend takes 100% CPU recording DVB-T

Chris Hubball chris at hubball.org
Sun Apr 2 13:32:36 UTC 2006


>> Does anyone out there have a Nova-T running with a reasonable CPU
>> usage?
>>
> That definitely sounds odd - mythbackend runs at between 5-15% CPU usage
> when capturing a single stream (on an AMD Sempron at 1GHz in low power
> mode).  I'd check whether you're doing commercial flagging (I've
> disabled this as I find it very inaccurate and it's quick enough to stick
> in cut points around the commercials later) as this'll add some load.

I've got all transcode and flagging options disabled.  I've tried it
again today and this time the CPU load is lower, however it never drops
below 50% which is still too high.  I'm running on a 1.2Ghz and playback
in software takes 50%, so I'm sure that if the backend was only taking
10% I'd easily be able to watch Live TV.

Here's the result from top - is there anything obviously wrong?

top - 14:24:57 up  3:16,  2 users,  load average: 1.04, 0.73, 0.49
Tasks:  72 total,   1 running,  71 sleeping,   0 stopped,   0 zombie
Cpu(s): 60.9% us,  1.7% sy,  0.3% ni, 36.4% id,  0.0% wa,  0.3% hi,  0.3% si
Mem:    483120k total,   473344k used,     9776k free,     2876k buffers
Swap:   979924k total,        0k used,   979924k free,   257068k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 2700 mythtv    16   0  178m  29m  11m S 57.4  6.2   1:03.70 mythbackend
 2545 mythtv    15   0 84616  29m  16m S  3.6  6.2   6:36.28 firefox-bin
 2721 root      10  -5     0    0    0 S  1.0  0.0   0:00.96 cx88[0] dvb
 1550 root      15   0  1608  384  312 S  0.3  0.1   0:01.05 klogd
 2104 mysql     15   0 46244  10m 4112 S  0.3  2.3   0:05.22 mysqld
 2168 mythtv    15   0     0    0    0 S  0.3  0.0   0:24.98 kdvb-fe-0

Cheers,
Chris.



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