[mythtv-users] Mythpreviewgen

Josu Lazkano josu.lazkano at gmail.com
Tue Sep 20 15:51:46 UTC 2011

2011/9/20 Josu Lazkano <josu.lazkano at gmail.com>:
> 2011/9/20 Michael T. Dean <mtdean at thirdcontact.com>:
>> On 09/19/2011 04:56 PM, Josu Lazkano wrote:
>>> Hello to all, I write lots of post this last few days, I am trying to
>>> get a stable system, I am getting lots of playback pauses from time. I
>>> have two Nvidia ION boards with same problems, I started all these
>>> post trying to fix my problem:
>>> http://www.gossamer-threads.com/lists/engine?list=mythtv;do=search_results;search_forum=forum_1;search_string=josu%20lazkano;search_type=AND&sb=post_time
>>> I am watching LiveTV with a "htop" terminal and I just hunt a process
>>> with high CPU on the playback stops, is the /usr/bin/mythpreviewgen.
>>> It is correlated with the stops, it happens 3 more time.
>>> I got a screenshot: http://dl.dropbox.com/u/1541853/mythpreviewgen.png
>>> There are 2 mythpreviewgen process with 27% and 17% CPU usage. Could
>>> it be this the cause of my playback stops? I read the wiki page about
>>> the Mythpreviewgen (http://www.mythtv.org/wiki/Mythpreviewgen), but
>>> there is no much info about it.
>>> Could I limit the CPU usage for this process? I would appreciate any
>>> help, I hope this will fix all my problems.
>>> Thanks for all help, best regards.
>> mythpreviewgen (and possibly some other "start/end of recordings"
>> activities) are definitely the cause of the "short playback pauses at
>> program transition".  It's possible mythpreviewgen could cause similar
>> pauses at other times if something kicks it off (like someone
>> setting/clearing a bookmark on a recording on another frontend while
>> you're watching a recording on yours).
>> Doesn't look like there's any code in mythpreviewgen to set a nice
>> value.  You could stick a myth_nice(17); somewhere in there and see if
>> it helps.
>> Mike
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users at mythtv.org
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> Thanks Mike, sorry but I don't know where to add the "myth_nice(17);".
> Is possible to disable this function? I never try it, but there is a
> cpulimit software to limit the CPU usage of a process, could be a good
> option?
> Thanks and best regards.
> I want to try
> --
> Josu Lazkano

Hello again, I am reading about nice() and ionice(). It looks like
they are for scheduled the CPU utilization, but I have no idea where
to configure it.

I read that -20 is the highest priority and 20 is the lowest priority,
so it will be good idea to assign 17 to mythpreviewgen as Mike

Please, can you help for this configuration? Where I must configure it?

Thanks for all your help.


Josu Lazkano

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