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36 * \brief Subroutines to run LINCS on GPU
38 * Copies data to GPU, runs LINCS and copies the results back.
40 * \author Artem Zhmurov <zhmurov@gmail.com>
41 * \ingroup module_mdlib
45 #include "constrtestrunners.h"
54 #include "gromacs/gpu_utils/devicebuffer.cuh"
55 #include "gromacs/hardware/device_information.h"
56 #include "gromacs/mdlib/lincs_gpu.cuh"
57 #include "gromacs/pbcutil/pbc.h"
58 #include "gromacs/utility/unique_cptr.h"
66 * Initialize and apply LINCS constraints on GPU.
68 * \param[in] testData Test data structure.
69 * \param[in] pbc Periodic boundary data.
71 void applyLincsGpu(ConstraintsTestData* testData, t_pbc pbc)
73 DeviceInformation deviceInfo;
74 const DeviceContext deviceContext(deviceInfo);
75 const DeviceStream deviceStream(deviceContext, DeviceStreamPriority::Normal, false);
77 auto lincsGpu = std::make_unique<LincsGpu>(testData->ir_.nLincsIter, testData->ir_.nProjOrder,
78 deviceContext, deviceStream);
80 bool updateVelocities = true;
81 int numAtoms = testData->numAtoms_;
82 float3 *d_x, *d_xp, *d_v;
84 lincsGpu->set(*testData->idef_, testData->numAtoms_, testData->invmass_.data());
86 setPbcAiuc(pbc.ndim_ePBC, pbc.box, &pbcAiuc);
88 allocateDeviceBuffer(&d_x, numAtoms, deviceContext);
89 allocateDeviceBuffer(&d_xp, numAtoms, deviceContext);
90 allocateDeviceBuffer(&d_v, numAtoms, deviceContext);
92 copyToDeviceBuffer(&d_x, (float3*)(testData->x_.data()), 0, numAtoms, deviceStream,
93 GpuApiCallBehavior::Sync, nullptr);
94 copyToDeviceBuffer(&d_xp, (float3*)(testData->xPrime_.data()), 0, numAtoms, deviceStream,
95 GpuApiCallBehavior::Sync, nullptr);
98 copyToDeviceBuffer(&d_v, (float3*)(testData->v_.data()), 0, numAtoms, deviceStream,
99 GpuApiCallBehavior::Sync, nullptr);
101 lincsGpu->apply(d_x, d_xp, updateVelocities, d_v, testData->invdt_, testData->computeVirial_,
102 testData->virialScaled_, pbcAiuc);
104 copyFromDeviceBuffer((float3*)(testData->xPrime_.data()), &d_xp, 0, numAtoms, deviceStream,
105 GpuApiCallBehavior::Sync, nullptr);
106 if (updateVelocities)
108 copyFromDeviceBuffer((float3*)(testData->v_.data()), &d_v, 0, numAtoms, deviceStream,
109 GpuApiCallBehavior::Sync, nullptr);
112 freeDeviceBuffer(&d_x);
113 freeDeviceBuffer(&d_xp);
114 freeDeviceBuffer(&d_v);