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36 * \brief Defines helper functionality for device transfers for tests
37 * for GPU host allocator.
39 * Undefined symbols in Google Test, GROMACS use of -Wundef, and the
40 * implementation of FindCUDA.cmake and/or nvcc mean that no
41 * compilation unit should include a gtest header while being compiled
42 * by nvcc. None of -isystem, -Wno-undef, nor the pragma GCC
45 * \author Mark Abraham <mark.j.abraham@gmail.com>
49 #include "devicetransfers.h"
51 #include "gromacs/gpu_utils/cudautils.cuh"
52 #include "gromacs/hardware/device_information.h"
53 #include "gromacs/utility/arrayref.h"
54 #include "gromacs/utility/exceptions.h"
55 #include "gromacs/utility/gmxassert.h"
56 #include "gromacs/utility/stringutil.h"
61 void doDeviceTransfers(const DeviceInformation& deviceInfo, ArrayRef<const char> input, ArrayRef<char> output)
63 GMX_RELEASE_ASSERT(input.size() == output.size(), "Input and output must have matching size");
68 status = cudaGetDevice(&oldDeviceId);
69 checkDeviceError(status, "Error while getting old device id.");
70 status = cudaSetDevice(deviceInfo.id);
71 checkDeviceError(status, "Error while setting device id to the first compatible GPU.");
74 status = cudaMalloc(&devicePointer, input.size());
75 checkDeviceError(status, "Error while creating buffer.");
77 status = cudaMemcpy(devicePointer, input.data(), input.size(), cudaMemcpyHostToDevice);
78 checkDeviceError(status, "Error while transferring host to device.");
79 status = cudaMemcpy(output.data(), devicePointer, output.size(), cudaMemcpyDeviceToHost);
80 checkDeviceError(status, "Error while transferring device to host.");
82 status = cudaFree(devicePointer);
83 checkDeviceError(status, "Error while releasing buffer.");
85 status = cudaSetDevice(oldDeviceId);
86 checkDeviceError(status, "Error while setting old device id.");