Commit: b3adce77667498c20cd44e7cf6d76f8424a6dd89 Author: Stefan Werner Date: Tue Nov 21 10:29:11 2017 +0100 Branches: blender-v2.79a-release https://developer.blender.org/rBb3adce77667498c20cd44e7cf6d76f8424a6dd89
Cycles: Workaround for performance loss with the CUDA 9.0 SDK. CUDA 9.0.176 apparently caused some slow down on high-end Pascal cards that can be mitigated by increasing the number of registers. See https://developer.blender.org/F1142667 for a detailed comparison. =================================================================== M intern/cycles/kernel/kernels/cuda/kernel_config.h =================================================================== diff --git a/intern/cycles/kernel/kernels/cuda/kernel_config.h b/intern/cycles/kernel/kernels/cuda/kernel_config.h index 9fa39dc9ebb..efea522d803 100644 --- a/intern/cycles/kernel/kernels/cuda/kernel_config.h +++ b/intern/cycles/kernel/kernels/cuda/kernel_config.h @@ -76,6 +76,11 @@ # define CUDA_KERNEL_MAX_REGISTERS 48 # define CUDA_KERNEL_BRANCHED_MAX_REGISTERS 63 +/* CUDA 9.0 seems to cause slowdowns on high-end Pascal cards unless we increase the number of registers */ +# if __CUDACC_VER_MAJOR__ == 9 && __CUDA_ARCH__ >= 600 +# #define CUDA_KERNEL_MAX_REGISTERS 64 +# endif + /* unknown architecture */ #else # error "Unknown or unsupported CUDA architecture, can't determine launch bounds" _______________________________________________ Bf-blender-cvs mailing list Bf-blender-cvs@blender.org https://lists.blender.org/mailman/listinfo/bf-blender-cvs
