I have a Nvidia GeForce GT 740M gpu with 384 cores with driver version 430 installed in ubuntu 18.04 but while rendering , blender spawns only on thread so rendering on gpu is much slower than CPU with 8 threads.
I've already tried this in blender 2.80.4 and 2.80.7 but the problem still persists.
Also changing the number of threads manually has no effect.
Any help is appreciated.Thanks
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Parsa Mousavi
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Are your System Preferences (Edit->Preferences->System) for the Cycles Render Devices set correctly? – Derrick Feb 11 '20 at 13:14
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Yes.I set it to cuda .And also in render menu in the side panel.Nvidia settings window shows that it uses 100% of the gpu but in the render window I can see that blender actually uses just one thread. – Parsa Mousavi Feb 11 '20 at 13:17
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GPU rendering in Blender always just calculates one tile at a time. This is unrelated to GPU utilization. – Robert Gützkow Feb 11 '20 at 14:28
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Can this affect the parallelism in rendering machines with hundreds of GPUs? – Parsa Mousavi Feb 11 '20 at 15:26