[mythtv-users] Mythbackend recording glitches

Allen Edwards allen.p.edwards at gmail.com
Thu Oct 18 22:13:49 UTC 2018


On Thu, Oct 18, 2018 at 2:22 PM Allen Edwards <allen.p.edwards at gmail.com>
wrote:

>
>
> On Thu, Oct 18, 2018 at 1:41 PM faginbagin <mythtv at hbuus.com> wrote:
>
>> On 10/17/2018 9:53 PM, Stephen Worthington wrote:
>>
>> <snip>
>>
>> > But you really do need to change to using the 64-bit version.  As of
>> > 18.04, Ubuntu no longer supports the i386 version, and for a number of
>> > versions before that the support has not been good - the i386 versions
>> > tend to have problems.  And MythTV has not been tested much on i386
>> > versions for a long time.
>>
>> While I agree with Stephen that Allen should change to a 64-bit version
>> of Ubuntu, I have to say Ubuntu still supports 32-bit CPUs. They have
>> dropped support for CPUs that don't support Physical Address Extension
>> (PAE), but 32 bit CPUs manufactured since around 2004 do support PAE.
>> _______________________________________________
>>
>
> Some new information.  I did a recording with mythfrontend off and it had
> glitches.  So that didn't work.
>
> I also think I might have figured out why my beloved Mythbuntu 8 was not
> working. I said that it died because of a disk failure but what I didn't
> say was that it was the second disk, one that was just for additional
> storage. What occured to me today was that I probably needed to just delete
> the reference to that now missing storage.  I ran mythbackend setup as part
> of documenting the settings and noticed that the second storage location
> was not there and then I saved the settings.  I am thinking that might fix
> my Mythbuntu 8 system. Then I can chalk up the multitude of hours I spent
> trying to get Mythbuntu 16 to work to "entertainment".
>
> Just for a point of comparison to document the "progress" that myth as
> made in the last 10 years. I reinstalled the 6200 video card and the old HD
> and there is no ripping like there was with Mythbuntu 16 with that card and
> no glitches.  I am, as I have said, perfectly happy with the performance of
> Mythbuntu 8 so if this proves to actually be stable, I may just quit here.
> I am recording and watching at the same time in "top" below and there is no
> swap used.  I notice that the buffers space is much smaller and I may have
> increased the buffers on the new setup at some point in the debugging stage
> but in any event it is of interest.
>
> But I have a 1T HD coming today so I have to decide which OS I am going to
> put on it...
>
> Allen
>
> top - 13:52:35 up 10 min,  2 users,  load average: 0.34, 0.31, 0.24
> Tasks: 131 total,   1 running, 130 sleeping,   0 stopped,   0 zombie
> Cpu(s): 12.5%us,  1.4%sy,  0.0%ni, 85.0%id,  0.3%wa,  0.0%hi,  0.8%si,
> 0.0%st
> Mem:   2075424k total,  1433176k used,   642248k free,    27556k buffers
> Swap:  6072528k total,        0k used,  6072528k free,   980256k cached
>
>   PID USER      PR  NI  VIRT  RES  SHR S %CPU %MEM    TIME+  COMMAND
>  6803 dad       20   0  306m 153m  71m S   14  7.6   0:13.38
> mythfrontend.re
>  6393 root      20   0  146m 121m  50m S    2  6.0   0:05.58 Xorg
>  6026 mythtv    20   0  306m  45m  11m S    0  2.2   0:12.48 mythbackend
>     1 root      20   0  2844 1692  544 S    0  0.1   0:01.06 init
>     2 root      15  -5     0    0    0 S    0  0.0   0:00.00 kthreadd
>     3 root      RT  -5     0    0    0 S    0  0.0   0:00.00 migration/0
>     4 root      15  -5     0    0    0 S    0  0.0   0:00.00 ksoftirqd/0
>     5 root      RT  -5     0    0    0 S    0  0.0   0:00.00 watchdog/0
>     6 root      RT  -5     0    0    0 S    0  0.0   0:00.00 migration/1
>
>
So what is up with the swap?  Looking at the screen capture for swapping
and the theory that it is swap that is causing the glitches, why is there
any swapping? There isn't any with mythbuntu 8 and there doesn't seem to be
a need in 16 except to clear memory for buffer/cache.  WTF?

KiB Mem :  2061948 total,   135672 free,   450240 used,  1476036 buff/cache
KiB Swap:  2094076 total,  1704088 free,   389988 used.  1349872 avail Mem

That says that memory used is 840M or less than half the RAM I have.  But
this buffer/cache is almost 1.5G. forcing about 400M to swap.

So before I go buy more memory that I don't need, how can I limit the
swapping?  Google is not too helpful, something about you can't do this and
everyone complains about it.

Allen
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