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| author | Stefan Werner <stefan.werner@tangent-animation.com> | 2017-11-21 12:29:11 +0300 |
|---|---|---|
| committer | Stefan Werner <stefan.werner@tangent-animation.com> | 2017-11-21 12:29:11 +0300 |
| commit | 1febc858559c054603073301a6c6dae44c737830 (patch) | |
| tree | c29e00cce3501920722a6e9255a04ba2d4eaecda /intern | |
| parent | 9325b9bf1539bcc440be03c3c360e0b7dd9dc3e7 (diff) | |
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.
Diffstat (limited to 'intern')
| -rw-r--r-- | intern/cycles/kernel/kernels/cuda/kernel_config.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/intern/cycles/kernel/kernels/cuda/kernel_config.h b/intern/cycles/kernel/kernels/cuda/kernel_config.h index 7ae205b7e14..d0e536f1b87 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" |