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Diffstat (limited to 'intern/cycles/kernel/device/cuda/config.h')
-rw-r--r-- | intern/cycles/kernel/device/cuda/config.h | 114 |
1 files changed, 114 insertions, 0 deletions
diff --git a/intern/cycles/kernel/device/cuda/config.h b/intern/cycles/kernel/device/cuda/config.h new file mode 100644 index 00000000000..46196dcdb51 --- /dev/null +++ b/intern/cycles/kernel/device/cuda/config.h @@ -0,0 +1,114 @@ +/* + * Copyright 2011-2013 Blender Foundation + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + */ + +/* Device data taken from CUDA occupancy calculator. + * + * Terminology + * - CUDA GPUs have multiple streaming multiprocessors + * - Each multiprocessor executes multiple thread blocks + * - Each thread block contains a number of threads, also known as the block size + * - Multiprocessors have a fixed number of registers, and the amount of registers + * used by each threads limits the number of threads per block. + */ + +/* 3.0 and 3.5 */ +#if __CUDA_ARCH__ == 300 || __CUDA_ARCH__ == 350 +# define GPU_MULTIPRESSOR_MAX_REGISTERS 65536 +# define GPU_MULTIPROCESSOR_MAX_BLOCKS 16 +# define GPU_BLOCK_MAX_THREADS 1024 +# define GPU_THREAD_MAX_REGISTERS 63 + +/* tunable parameters */ +# define GPU_KERNEL_BLOCK_NUM_THREADS 256 +# define GPU_KERNEL_MAX_REGISTERS 63 + +/* 3.2 */ +#elif __CUDA_ARCH__ == 320 +# define GPU_MULTIPRESSOR_MAX_REGISTERS 32768 +# define GPU_MULTIPROCESSOR_MAX_BLOCKS 16 +# define GPU_BLOCK_MAX_THREADS 1024 +# define GPU_THREAD_MAX_REGISTERS 63 + +/* tunable parameters */ +# define GPU_KERNEL_BLOCK_NUM_THREADS 256 +# define GPU_KERNEL_MAX_REGISTERS 63 + +/* 3.7 */ +#elif __CUDA_ARCH__ == 370 +# define GPU_MULTIPRESSOR_MAX_REGISTERS 65536 +# define GPU_MULTIPROCESSOR_MAX_BLOCKS 16 +# define GPU_BLOCK_MAX_THREADS 1024 +# define GPU_THREAD_MAX_REGISTERS 255 + +/* tunable parameters */ +# define GPU_KERNEL_BLOCK_NUM_THREADS 256 +# define GPU_KERNEL_MAX_REGISTERS 63 + +/* 5.x, 6.x */ +#elif __CUDA_ARCH__ <= 699 +# define GPU_MULTIPRESSOR_MAX_REGISTERS 65536 +# define GPU_MULTIPROCESSOR_MAX_BLOCKS 32 +# define GPU_BLOCK_MAX_THREADS 1024 +# define GPU_THREAD_MAX_REGISTERS 255 + +/* tunable parameters */ +# define GPU_KERNEL_BLOCK_NUM_THREADS 256 +/* 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 GPU_KERNEL_MAX_REGISTERS 64 +# else +# define GPU_KERNEL_MAX_REGISTERS 48 +# endif + +/* 7.x, 8.x */ +#elif __CUDA_ARCH__ <= 899 +# define GPU_MULTIPRESSOR_MAX_REGISTERS 65536 +# define GPU_MULTIPROCESSOR_MAX_BLOCKS 32 +# define GPU_BLOCK_MAX_THREADS 1024 +# define GPU_THREAD_MAX_REGISTERS 255 + +/* tunable parameters */ +# define GPU_KERNEL_BLOCK_NUM_THREADS 512 +# define GPU_KERNEL_MAX_REGISTERS 96 + +/* unknown architecture */ +#else +# error "Unknown or unsupported CUDA architecture, can't determine launch bounds" +#endif + +/* Compute number of threads per block and minimum blocks per multiprocessor + * given the maximum number of registers per thread. */ + +#define ccl_gpu_kernel(block_num_threads, thread_num_registers) \ + extern "C" __global__ void __launch_bounds__(block_num_threads, \ + GPU_MULTIPRESSOR_MAX_REGISTERS / \ + (block_num_threads * thread_num_registers)) + +/* sanity checks */ + +#if GPU_KERNEL_BLOCK_NUM_THREADS > GPU_BLOCK_MAX_THREADS +# error "Maximum number of threads per block exceeded" +#endif + +#if GPU_MULTIPRESSOR_MAX_REGISTERS / (GPU_KERNEL_BLOCK_NUM_THREADS * GPU_KERNEL_MAX_REGISTERS) > \ + GPU_MULTIPROCESSOR_MAX_BLOCKS +# error "Maximum number of blocks per multiprocessor exceeded" +#endif + +#if GPU_KERNEL_MAX_REGISTERS > GPU_THREAD_MAX_REGISTERS +# error "Maximum number of registers per thread exceeded" +#endif |