[mythtv-commits] Ticket #11026: mythpreviewgen is run with too high a scheduling priority; causes stuttering playback

[MythTV]

#11026: mythpreviewgen is run with too high a scheduling priority; causes
stuttering playback
-------------------------------------+-------------------------------------
 Reporter:  O Lupton                 |           Type:  Bug Report -
  <oliverlupton@…>                   |  General
   Status:  new                      |       Priority:  minor
Milestone:  unknown                  |      Component:  MythTV -
  Version:  0.25-fixes               |  Mythpreviewgen
 Keywords:  mythpreviewgen, nice,    |       Severity:  medium
  ionice                             |  Ticket locked:  0
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 mythpreviewgen seems to be run by default with too high a cpu/io
 scheduling priority. This causes stuttering playback (particularly for HD
 content) if a preview is generated in the background (for example, storing
 a bookmark in the recording you are watching updates the preview and makes
 the playback stutter).

 For the moment I am working around this by moving mythpreviewgen to
 mythpreviewgen.real and putting this script in its place:

 {{{
 $ cat bin/mythpreviewgen
 #!/bin/bash
 ionice -c 2 -n 7 nice -n 19 /usr/bin/mythpreviewgen.real --seconds 250
 "$@"
 exit
 }}}

 (this is less annoying, but the --seconds parameter is there because I
 can't find another way of telling Myth how far too seek)

 It would be neater if MythTV could automatically reduce the priority of
 the mythpreviewgen process.

 This seems to have been mentioned on the mailing list in the past, but I
 couldn't find any tickets relating to it - apologies if I missed one.

-- 
Ticket URL: <http://code.mythtv.org/trac/ticket/11026>
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