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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"
63 /*! \brief Help give useful diagnostics about error \c status while doing \c message.
65 * \throws InternalError If status indicates failure, supplying
66 * descriptive text from \c message. */
67 static void throwUponFailure(cudaError_t status, const char* message)
69 if (status != cudaSuccess)
71 GMX_THROW(InternalError(formatString("Failure while %s", message)));
78 void doDeviceTransfers(const DeviceInformation& deviceInfo, ArrayRef<const char> input, ArrayRef<char> output)
80 GMX_RELEASE_ASSERT(input.size() == output.size(), "Input and output must have matching size");
85 status = cudaGetDevice(&oldDeviceId);
86 throwUponFailure(status, "getting old device id");
87 status = cudaSetDevice(deviceInfo.id);
88 throwUponFailure(status, "setting device id to the first compatible GPU");
91 status = cudaMalloc(&devicePointer, input.size());
92 throwUponFailure(status, "creating buffer");
94 status = cudaMemcpy(devicePointer, input.data(), input.size(), cudaMemcpyHostToDevice);
95 throwUponFailure(status, "transferring host to device");
96 status = cudaMemcpy(output.data(), devicePointer, output.size(), cudaMemcpyDeviceToHost);
97 throwUponFailure(status, "transferring device to host");
99 status = cudaFree(devicePointer);
100 throwUponFailure(status, "releasing buffer");
102 status = cudaSetDevice(oldDeviceId);
103 throwUponFailure(status, "setting old device id");