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List:       kde-core-devel
Subject:    Re: KDE4 power consumption issues
From:       Matthias Kretz <kretz () kde ! org>
Date:       2007-11-12 16:24:08
Message-ID: 200711121724.08958.kretz () kde ! org
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On Sunday 11 November 2007, Olivier Goffart wrote:
> My guess is the problem is in Phonon.

to be more precise: in libxine. libphonon itself has no timers that I can 
think of right now.

> The only thing I do is to keep a pointer to Phonon::MediaObject and
> Phonon::AudioOutput

Yes. Deleting those objects might help, but I'm not 100% sure. Though the 
numbers will only go down 10s later (if at all) for reasons you don't want to 
know.

Btw, I've seen worse numbers from xine. But basically the problem is that its 
demuxer, decoder, and output threads are in a loop calling
  xine_usec_sleep (5000);
whenever no new data is available. xine_usec_sleep uses nanosleep when 
available and usleep otherwise:
#if HAVE_NANOSLEEP
  /* nanosleep is prefered on solaris, because it's mt-safe */
  struct timespec ts, remaining;

  ts.tv_sec =   usec / 1000000;
  ts.tv_nsec = (usec % 1000000) * 1000;
  while (nanosleep (&ts, &remaining) == -1 && errno == EINTR)
    ts = remaining;
#else
#  if WIN32
  Sleep(usec / 1000);
#  else
  usleep(usec);
#  endif
#endif

-- 
________________________________________________________
Matthias Kretz (Germany)                            <><
http://Vir.homelinux.org/
MatthiasKretz@gmx.net, kretz@kde.org,
Matthias.Kretz@urz.uni-heidelberg.de

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