[mythtv-commits] Ticket #7953: Reduce mythfrontend CPU usage on idle screens

[MythTV]

#7953: Reduce mythfrontend CPU usage on idle screens
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 Reporter:  Jim Stichnoth <stichnot@…>          |       Owner:  ijr    
     Type:  patch                               |      Status:  new    
 Priority:  minor                               |   Milestone:  unknown
Component:  MythTV - General                    |     Version:  unknown
 Severity:  medium                              |     Mlocked:  0      
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 Many people have observed that mythfrontend consumes a surprising amount
 of CPU time while sitting idle on a screen even as simple as the main
 menu.  The reported CPU usage is usually either 7% or 14%.  This is due to
 the QTimer implementation which is used for the 70Hz
 MythMainWindowPrivate::drawTimer.  To get the best possible precision,
 QTimer may spend the last 1-2ms busy-waiting before the timeout signal.

 This excess CPU usage can be a real issue for a combined FE/BE machine.
 Also, it adds to the CPU requirements during playback because the
 drawTimer is not stopped during playback.

 The attached patch uses a simple timer class based on usleep().  On my ION
 system, idle frontend CPU usage drops from 7% to around 1%, according to
 "top".

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Ticket URL: <http://svn.mythtv.org/trac/ticket/7953>
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