CPU usage while render on GPU

Support Lighting and Rendering
1

My intention is to render animations on GPU and CPU parallel on two blender instances. It is working but I expected more(mean less render time). Made some tests and checked, when I render on GPU only, CPU usage is quite high although the render process is running on the GPU. See attachment…

Why need GPU rendering so much CPU power? Is there a way to lower CPU usage while rendering on the GPU?
Could be nice to save some CPU power for rendering to theoretically speed up the whole render process for animations.

I have Intel I5 4670K and Nvidia gtx 660 and using Blender on Linux Mint 17.

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2

Is there a way to lower CPU usage while rendering on the GPU?

The developer try to solf it during 2.71 development but take it back before release.
To many problems with different cards.
I have 2 GPU and Blender use 2 CPU 100% during GPU rendering, very bad.
I hope the Blender devs get it solved.

Cheers, mib

3

Thanks for your answer mib2berlin. Good news is that developer already tried to solve this issue. I hope soon it will be also solved.

Cheers