Re: [gentoo-user] How to manage load on the GPU?

[J. Roeleveld]

On Wednesday, May 20, 2020 9:56:07 AM CEST tuxic@××××××.de wrote:
> On 05/20 09:44, J. Roeleveld wrote:
> > On Monday, May 18, 2020 8:22:52 PM CEST tuxic@××××××.de wrote:
> > > On 05/18 09:58, Matt Connell (Gmail) wrote:
> > > > On 2020-05-18 09:40, tastytea wrote:
> > > > > Another solution is to modify the priority yourself, with `renice
> > > > > --priority 15 $(pidof blender)` for example. The priority can be
> > > > > from
> > > > > -20 (very high priority) to 19 (very low priority).
> > > >
> > > > According to the man page for renice, there is a --gpu flag that can
> > > > be
> > > > used (today I learned) that the OP may want to try as well.
> > >
> > > If it is a load/performance problem, why is only
> > > firefox/internet-video affected?
> >
> > firefox might be using GPU-offloading for the video playback (decoder in
> > GPU) where MPV might not use the GPU for decoding and is only CPU-bound.
> >
> > --
> > Joost
>
> Hi Joost,
>
> mpv is installed as follows:
>
>
> [I] media-video/mpv
>      Available versions:  0.32.0-r1^t **9999*l^t {+X +alsa aqua archive
> bluray cdda +cli coreaudio cplugins cuda debug doc drm dvb dvd +egl gamepad
> gbm +iconv jack javascript jpeg lcms +libass libcaca libmpv +lua luajit
> openal +opengl oss pulseaudio raspberry-pi rubberband samba sdl selinux
> test tools +uchardet vaapi vdpau vulkan wayland +xv zimg zlib
> PYTHON_TARGETS="python3_6 python3_7 python3_8"} Installed versions:
> 0.32.0-r1^t(08:15:17 AM 05/16/2020)(X alsa cdda cli cuda dvb dvd egl iconv
> jpeg lcms libass lua luajit opengl oss rubberband sdl uchardet xv zlib
> -aqua -archive -bluray -coreaudio -cplugins -debug -doc -drm -gamepad -gbm
> -jack -javascript -libcaca -libmpv -openal -pulseaudio -raspberry-pi -samba
> -selinux -test -tools -vaapi -vdpau -vulkan -wayland -zimg
> PYTHON_TARGETS="python3_7 -python3_6 -python3_8") Homepage:
> https://mpv.io/ https://github.com/mpv-player/mpv Description:
> Media player based on MPlayer and mplayer2
>
>
> The USE flag "cuda" - therefore mpv should be able to utilize the
> GPU...
>
> Cheers!
> Meino

Meino,

I would agree as well, except I don't think all video-codecs can be offloaded 
to the GPU.
"mpv" might also be clever enough not to use the GPU if it is too busy whereas 
firefox/video might not have that logic.

I don't know enough about the internals to be 100% certain, but, to me, this 
is a plausible explanation. Especially as video-cards have built-in decoders, 
but not for all codecs.

--
Joost