On 29 Jul 2014, at 16:41, Darren Hart dvh...@linux.intel.com wrote:
On Thu, Jul 24, 2014 at 09:45:41PM +0100, Chris Tapp wrote:
I've got a recipe for an application. This has:
1) A main thread;
2) An OpenGL ('X' / EGL) graphics rendering thread created using posix
threads;
3) As many threads as required from the graphics thread for GStreamer to
service various pipelines.
On a Cedartrail platform this happily uses multiple cores.
Major difference here is graphics chip, cedartrail uses EMGD binary drivers,
baytrail (valleyisland) uses the open source Intel i965 drivers.
I recently (yesterday) updated meta-intel master and daisy to properly support
video acceleration in gstreamer 1.0 - I don't know if this impacts you or not.
Thanks for the pointer. I'll give it a try and see if it makes a difference.
However, if I use the same recipe under a 64-bit valleyisland build (daisy) it
only ever uses a single core (and virtually grinds to a halt).
'top' shows CPU usage for the application never goes above 25% (J1900, so
four
cores available). Running four instances of 'yes' gets the total CPU usage to
100%, so all the cores are available.
Does /proc/cpu list four cores?
It does.
I've also found that running the GStreamer pipeline outside of (and at the same
time as) my application works as expected - i.e. more CPU resources are used
and the application runs at the target loop time, so the system can definitely
do what I want...
'taskset' shows that the affinity mask for the application is not restricting
the set of available cores.
Umm... Any ideas what's going on here?
It looks as if GStreamer and OpenGL are fighting for access to something, but
the pipelines only render to 'fakesink' and 'appsink'.
I don't have any GL/GST development experience, so this is likely best taken
to
those respective lists.
Thanks, I've already tried that and not got anything back ;-)
--
Darren
Chris Tapp
opensou...@keylevel.com
www.keylevel.com
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