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67 lines
1.8 KiB
C++
67 lines
1.8 KiB
C++
/*
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Copyright 2024 SINTEF AS
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This file is part of the Open Porous Media project (OPM).
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OPM is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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OPM is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with OPM. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef OPM_GPU_THREAD_UTILS_HPP
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#define OPM_GPU_THREAD_UTILS_HPP
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#include <cstddef>
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#include <cuda.h>
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#include <cuda_runtime.h>
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#include <opm/simulators/linalg/gpuistl/detail/gpu_safe_call.hpp>
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/*
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This file provides some logic for handling how to choose the correct thread-block size
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*/
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namespace Opm::gpuistl::detail
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{
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constexpr inline size_t
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getThreads([[maybe_unused]] size_t numberOfRows)
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{
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return 1024;
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}
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inline size_t
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getBlocks(size_t numberOfRows)
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{
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const auto threads = getThreads(numberOfRows);
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return (numberOfRows + threads - 1) / threads;
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}
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// Kernel here is the function object of the cuda kernel
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template <class Kernel>
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inline int
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getCudaRecomendedThreadBlockSize(Kernel k, int suggestedThrBlockSize = -1)
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{
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if (suggestedThrBlockSize != -1) {
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return suggestedThrBlockSize;
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}
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int blockSize;
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int tmpGridSize;
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OPM_GPU_SAFE_CALL(cudaOccupancyMaxPotentialBlockSize(&tmpGridSize, &blockSize, k, 0, 0));
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return blockSize;
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}
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inline int
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getNumberOfBlocks(int wantedThreads, int threadBlockSize)
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{
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return (wantedThreads + threadBlockSize - 1) / threadBlockSize;
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}
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} // namespace Opm::gpuistl::detail
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#endif
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