[mythtv-users] Excessive CPU usage with 27.5 x64 Fedora?

[Another Sillyname]

No Changes at all except the upgrade to .27-5.....

After doing some further investigation.....it looks like the thread
overload happens when the text on the menu page starts 'scrolling'
(left to right in the title list and up/down in the detailed summary
info box)....If I do something as stupid as changing the selection in
the video list the scrolling stops for a couple of seconds while it
loads graphics and metadata, during this time processor load is
nominal/normal....however as SOON as scrolling restarts CPU usage goes
through the roof.

I've done a strace dump and will have a go at analysing it.....

Any other ideas guys?

On 7 May 2014 20:48, Jonatan Lindblad <mythtv at comhem.se> wrote:
> On 2014-05-07 20:57, Another Sillyname wrote:
>>
>> I've just upgraded to 27.5 on a Mythfrontend Fedora x64 box and
>> something seems to have got broken, previous version has run happily
>> on this machine for about a year with 3-4 month yum updates.
>>
>> I noticed that when a recording or video ended the 'return' to menu
>> screen was not snappy and sometimes it would only partially return
>> (i.e. The last frame from the video would take up the majority of the
>> screen with a 'box' where you could see the part of the menu screen
>> visible, however the behaviour was inconsistent).
>
>
> Sounds like a graphics driver/X issue?
>
> Have you tried to change to a different theme painter and/or playback
> profile?
>
>
>> So I've taken that machine out of production to do some analysis.....
>>
>> Clean Boot
>>
>> Start HTOP in a Terminal Session
>>
>> Start mythfrontend in a seperate Terminal Session
>>
>> Library-->  Recordings -->  Select just one recording....Play
>> recording for say 10 seconds.
>>
>> Exit out of recording..back to recordings selection menu
>>
>> Select HTOP Terminal Session to see what's happening
>>
>> mythfrontend has saturated all 4 cores on a quad core box at 100% and
>> just sits there eat CPU cycles even though mythfrontend isn't doing
>> anything 'active'.
>>
>> Screengrab here
>>
>> http://postimg.org/image/pl3eywb2j/
>
>
> If you enable "Tree view" and "Show custom thread names" we might see the
> types of the busy threads.
>
> You could also use strace to find out what system calls those threads are
> calling, e.g.
> strace -p 1605
>
> Cheers
>
> --
> Jonatan
>
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