i hope this is the right section for this!
i have a question about the usage of cpu in blender rendering.
i have an i5 750 cpu, so 4 cores, 4 threads.
when i render an image i can see the 4 cores fully used, but at the end when it start to render the last part of the image it uses only one of them. i noticed the problem in one image that has a “really heavy to compute last part” and to render only this part takes 10 minutes, about the half of the total render time. and for all this 10 minutes blender uses only 1 of the 4 cores of the cpu.
i have this with both 2.49b and 2.5x
is it normal? i have the threads set to 4 (and is the same if i leave the option on auto).
i had a similar issue with physics simulations, in which the usage of the cpu is around 40% all time long.
does anyone know how to solve this? or it is like this and nothing can be done?
thank for any help!