[mythtv-users] Help With High CPU Load on Backend and Frontend

[Andrew McCauley]

Hi All-

I am having an issue with my Mythtv backend and frontend.  The system is
working ok, but I am seeing that both the BE and FE are keeping one core of
the CPU at 100 or there abouts all of the time.  This started about 6
months ago, but since it was working, I didn't want to mess with things. I
am running Mythbuntu the following build:
MythTV Version : v0.27-124-gd965061

I have 2 or 3 year old Intel I3 combined FE/BE.
Here is what top shows:
top - 15:24:02 up 8 days, 16:20,  2 users,  load average: 2.34, 2.30, 2.37
Tasks: 188 total,   1 running, 187 sleeping,   0 stopped,   0 zombie
Cpu(s): 13.7%us, 37.6%sy,  0.0%ni, 47.0%id,  1.6%wa,  0.0%hi,  0.1%si,
 0.0%st
Mem:   3973608k total,  3807508k used,   166100k free,    12484k buffers
Swap:  8062968k total,  1013136k used,  7049832k free,  2679528k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 2465 mythtv    20   0 2833m  44m 5976 S  104  1.2  12749:28 mythbackend
 1808 ajmccaul  20   0 4106m 230m  11m S  101  5.9  12685:34 mythfrontend.re
15130 root      20   0 17340 1364  956 R    0  0.0   0:00.06 top
    1 root      20   0 24604 1616  620 S    0  0.0   0:00.64 init
    2 root      20   0     0    0    0 S    0  0.0   0:00.08 kthreadd
    3 root      20   0     0    0    0 S    0  0.0   0:16.45 ksoftirqd/0
    5 root      20   0     0    0    0 S    0  0.0   0:00.20 kworker/u:0
    6 root      RT   0     0    0    0 S    0  0.0   0:01.96 migration/0
    7 root      RT   0     0    0    0 S    0  0.0   0:01.46 watchdog/0
    8 root      RT   0     0    0    0 S    0  0.0   0:00.16 migration/1
   10 root      20   0     0    0    0 S    0  0.0   0:05.88 ksoftirqd/1
   11 root      RT   0     0    0    0 S    0  0.0   0:01.28 watchdog/1
   12 root      RT   0     0    0    0 S    0  0.0   0:03.37 migration/2
   14 root      20   0     0    0    0 S    0  0.0   0:31.91 ksoftirqd/2

The system is recording a program right now, but the FE is idle.  When the
system is not recording anything, it the issue remains unchanged.  Further,
my second FE has the same issue even though it is also idle (not playing
video right now):

top - 15:27:08 up 6 days, 39 min,  2 users,  load average: 1.39, 1.19, 1.24
Tasks: 152 total,   2 running, 150 sleeping,   0 stopped,   0 zombie
Cpu(s):  5.0%us, 21.1%sy,  0.0%ni, 73.9%id,  0.0%wa,  0.0%hi,  0.0%si,
 0.0%st
Mem:   1017692k total,   915964k used,   101728k free,    29844k buffers
Swap:  1999868k total,   119860k used,  1880008k free,   347552k cached

  PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
 1610 ajmccaul  20   0 4051m 373m  21m S  103 37.6   4917:59 mythfrontend.re
12115 root      20   0     0    0    0 S    1  0.0   0:00.21 kworker/u:0
12414 ajmccaul  20   0 17340 1336  968 R    0  0.1   0:00.06 top
    1 root      20   0 24708 2268 1168 S    0  0.2   0:01.79 init
    2 root      20   0     0    0    0 S    0  0.0   0:00.24 kthreadd
    3 root      20   0     0    0    0 S    0  0.0   0:15.31 ksoftirqd/0
    6 root      RT   0     0    0    0 S    0  0.0   0:00.07 migration/0
    7 root      RT   0     0    0    0 S    0  0.0   0:02.93 watchdog/0
    8 root      RT   0     0    0    0 S    0  0.0   0:00.22 migration/1
   10 root      20   0     0    0    0 S    0  0.0   0:02.00 ksoftirqd/1
   12 root      RT   0     0    0    0 S    0  0.0   0:02.30 watchdog/1
   13 root      RT   0     0    0    0 S    0  0.0   0:00.05 migration/2
   15 root      20   0     0    0    0 S    0  0.0   0:12.73 ksoftirqd/2
   16 root      RT   0     0    0    0 S    0  0.0   0:02.50 watchdog/2

What can I do to track down the cause of the CPU usage?  Both frontends and
the backend technically are working, although they are sometimes slow.  I
have to think that there is something under the hood that is causing this.
 Please help.

Thank you anyone for the help in looking at this and giving me guidance.

Regards,
Andrew
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