primusrun is not using discrete GPU with paraview
with a builded ParaView (5.6 or master), on a laptop with a discrete nvidia card and an integrated intel chipset, the following behavior can be observed :
./bin/paraview Help -> About -> OpenGL : Mesa... optirun ./bin/paraview Help -> About -> OpenGL : Nvidia... primusrun ./bin/paraview Help -> About -> OpenGL : Mesa
The last part is unexepected
With ParaView 5.6 release, this behavior does not appear.
This behavior is not only a reporting error but a performance drop with complex rendering can also be observed.
glxinfo and glxgears do not show this behavior.
On ArchLinux, with nvidia 418.56, bumblebee 3.2.1, primus 20151110