By default OIDN has a `setAffinity` option set to `True`. This allows
OIDN to set it's own CPU affinity, and on most systems this resulted in
it only running on one thread per CPU core.
This setting was overwritten in Cycles and the CPU compositor
to allow Blender to control CPU affinity, allowing OIDN to use all
threads on a system. However this wasn't done for the CPU denoiser
in the GPU compositor.
This commit fixes that by setting `setAffinity` to `False` in the
CPU denoiser in the GPU compositor.
Performance:
I found no measurable improvement to performance on a AMD Ryzen 9 5950X
Pull Request: https://projects.blender.org/blender/blender/pulls/130360
a6c832a67d