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37 * Runners for tests of CUDA types compatibility.
39 * \author Artem Zhmurov <zhmurov@gmail.com>
43 #include "typecasts_runner.h"
49 #include "gromacs/gpu_utils/cudautils.cuh"
50 #include "gromacs/gpu_utils/devicebuffer.h"
51 #include "gromacs/gpu_utils/gpu_testutils.h"
52 #include "gromacs/gpu_utils/typecasts.cuh"
53 #include "gromacs/utility/exceptions.h"
54 #include "gromacs/utility/stringutil.h"
56 #if GMX_GPU == GMX_GPU_CUDA
64 /* \brief Perform a component-wise conversion of the float3 vector back to RVec format.
66 * This is needed to pass the data back to the CPU testing code for comparison with the initial input.
68 * \param[out] rVecOutput Output data in RVec format for the output.
69 * \param[in] float3Output Output data in float3 format.
70 * \param[in] numElements Size of the data buffers.
72 void inline saveFloat3InRVecFormat(std::vector<gmx::RVec>& rVecOutput, const float3* float3Output, int numElements)
74 for (int i = 0; i < numElements; i++)
76 rVecOutput[i][XX] = float3Output[i].x;
77 rVecOutput[i][YY] = float3Output[i].y;
78 rVecOutput[i][ZZ] = float3Output[i].z;
82 void convertRVecToFloat3OnHost(std::vector<gmx::RVec>& rVecOutput, const std::vector<gmx::RVec>& rVecInput)
84 const int numElements = rVecInput.size();
86 float3* dataFloat3 = asFloat3(const_cast<RVec*>(rVecInput.data()));
88 saveFloat3InRVecFormat(rVecOutput, dataFloat3, numElements);
91 //! Number of CUDA threads in a block.
92 constexpr static int c_threadsPerBlock = 256;
94 /*! \brief GPU kernel to perform type conversion on the device.
96 * \param[out] gm_float3Output Buffer to write the output into.
97 * \param[in] gm_rVecInput Input data in RVec format.
98 * \param[in] size Size of the data buffers.
101 static __global__ void convertRVecToFloat3OnDevice_kernel(DeviceBuffer<float3> gm_float3Output,
102 DeviceBuffer<RVec> gm_rVecInput,
105 int threadIndex = blockIdx.x * blockDim.x + threadIdx.x;
106 if (threadIndex < size)
108 gm_float3Output[threadIndex] = asFloat3(gm_rVecInput)[threadIndex];
112 void convertRVecToFloat3OnDevice(std::vector<gmx::RVec>& h_rVecOutput, const std::vector<gmx::RVec>& h_rVecInput)
114 if (canComputeOnGpu())
116 const int numElements = h_rVecInput.size();
118 DeviceBuffer<RVec> d_rVecInput;
119 allocateDeviceBuffer(&d_rVecInput, numElements, nullptr);
120 copyToDeviceBuffer(&d_rVecInput, h_rVecInput.data(), 0, numElements, nullptr,
121 GpuApiCallBehavior::Sync, nullptr);
123 DeviceBuffer<float3> d_float3Output;
124 allocateDeviceBuffer(&d_float3Output, numElements * DIM, nullptr);
126 std::vector<float3> h_float3Output(numElements);
128 KernelLaunchConfig kernelLaunchConfig;
129 kernelLaunchConfig.gridSize[0] = (numElements + c_threadsPerBlock - 1) / c_threadsPerBlock;
130 kernelLaunchConfig.blockSize[0] = c_threadsPerBlock;
131 kernelLaunchConfig.blockSize[1] = 1;
132 kernelLaunchConfig.blockSize[2] = 1;
133 kernelLaunchConfig.sharedMemorySize = 0;
134 kernelLaunchConfig.stream = nullptr;
136 auto kernelPtr = convertRVecToFloat3OnDevice_kernel;
137 const auto kernelArgs = prepareGpuKernelArguments(
138 kernelPtr, kernelLaunchConfig, &d_float3Output, &d_rVecInput, &numElements);
139 launchGpuKernel(kernelPtr, kernelLaunchConfig, nullptr,
140 "convertRVecToFloat3OnDevice_kernel", kernelArgs);
142 copyFromDeviceBuffer(h_float3Output.data(), &d_float3Output, 0, numElements, nullptr,
143 GpuApiCallBehavior::Sync, nullptr);
145 saveFloat3InRVecFormat(h_rVecOutput, h_float3Output.data(), numElements);
147 freeDeviceBuffer(&d_rVecInput);
148 freeDeviceBuffer(&d_float3Output);
155 #endif // GMX_GPU == GMX_GPU_CUDA