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Maniphest T52509

Open CL GPU Render is Slower than CPU Render
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Description

System Information
Operating system and graphics card
System Information
MacBook Pro (15-inch, Late 2016)
Operating system and graphics card
Mac OS Sierra 10.12.6
Radeon Pro 460 4096 MB
Intel HD Graphics 530 1536 MB

Blender Version
Broken:
Blender Version 2.78 (2.78 2017-02-27), Blender

Short description of error
GPU Render is not using the Radeon Pro GPU properly

Exact steps for others to reproduce the error
Based on a (as simple as possible) attached .blend file with minimum amount of steps

Any attempts to use GPU rendering in either Supported or Ex[erimental GPU settings fails. Tried User settings with only the Radeon Pro selected and both the CPU and Radeon Pro selected with no different results.



Event Timeline

Luis Jones (Hawaiikoa) created this task.Aug 23 2017, 5:27 PM
Brecht Van Lommel (brecht) changed the task status from Unknown Status to Archived.Aug 23 2017, 6:04 PM
Brecht Van Lommel (brecht) claimed this task.
Brecht Van Lommel (brecht) added a subscriber: Brecht Van Lommel (brecht).

Laptop GPU's are not great for ray tracing, it's not unexpected that they can be slower than the CPU. Blender 2.79 has more OpenCL rendering optimizations, so it may help, but this kind of speedup just not something we can guarantee. Particularly on macOS performance is not great because Apple stopped updating their OpenCL implementation some years ago.