SIMEPL SCENE: huge difference in Rays/s between IR and Production

[cecofuli]

As in the title, with this simple scene:

Plane, glass, sun+sky (default settings):

PT+PT: 9.800.000
IR:  7.200.000  (# threads override =0)

Maybe is it for this problem?

https://forum.corona-renderer.com/index.php/topic,4751.msg44494.html#msg44494

[maru]

As far as I remember IR uses only one core (half cores? all cores -1?) but let's wait for Keymaster.

[cecofuli]

You can set IR to use all cores (# threads override =0), all cores -1 (# threads override =-1),  all cores -2 (# threads override =-2) etc...

[Ondra]

interactive by default uses 4 PT samples instead of 16. if you set PT samples to 4, you will get the same slowdown even in regular rendering.

The scene is simply too simple to be representative, in such extreme case, writing to framebuffer will be the main source of overhead. with PT16, there is less writing, so greater speed.

[cecofuli]

Ok, now I understand! Usually, for testing and debug, I try to use as simple scene as I can =)