2 * This file is part of the GROMACS molecular simulation package.
4 * Copyright (c) 2018,2019, by the GROMACS development team, led by
5 * Mark Abraham, David van der Spoel, Berk Hess, and Erik Lindahl,
6 * and including many others, as listed in the AUTHORS file in the
7 * top-level source directory and at http://www.gromacs.org.
9 * GROMACS is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public License
11 * as published by the Free Software Foundation; either version 2.1
12 * of the License, or (at your option) any later version.
14 * GROMACS is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with GROMACS; if not, see
21 * http://www.gnu.org/licenses, or write to the Free Software Foundation,
22 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
24 * If you want to redistribute modifications to GROMACS, please
25 * consider that scientific software is very special. Version
26 * control is crucial - bugs must be traceable. We will be happy to
27 * consider code for inclusion in the official distribution, but
28 * derived work must not be called official GROMACS. Details are found
29 * in the README & COPYING files - if they are missing, get the
30 * official version at http://www.gromacs.org.
32 * To help us fund GROMACS development, we humbly ask that you cite
33 * the research papers on the package. Check out http://www.gromacs.org.
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 "constr_impl.h"
52 #include <unordered_map>
55 #include "gromacs/gpu_utils/devicebuffer.cuh"
56 #include "gromacs/gpu_utils/gpu_utils.h"
57 #include "gromacs/math/vec.h"
58 #include "gromacs/math/vectypes.h"
59 #include "gromacs/mdlib/constr.h"
60 #include "gromacs/mdlib/lincs_cuda.cuh"
61 #include "gromacs/pbcutil/pbc.h"
62 #include "gromacs/utility/unique_cptr.h"
70 * Initialize and apply LINCS constraints on CUDA-enabled GPU.
72 * \param[in] testData Test data structure.
73 * \param[in] pbc Periodic boundary data.
75 void applyLincsCuda(ConstraintsTestData *testData, t_pbc pbc)
77 auto lincsCuda = std::make_unique<LincsCuda>(testData->ir_.nLincsIter,
78 testData->ir_.nProjOrder);
80 bool updateVelocities = true;
81 int numAtoms = testData->numAtoms_;
82 float3 *d_x, *d_xp, *d_v;
84 lincsCuda->set(testData->idef_, testData->md_);
85 lincsCuda->setPbc(&pbc);
87 allocateDeviceBuffer(&d_x, numAtoms, nullptr);
88 allocateDeviceBuffer(&d_xp, numAtoms, nullptr);
89 allocateDeviceBuffer(&d_v, numAtoms, nullptr);
91 copyToDeviceBuffer(&d_x, (float3*)(testData->x_.data()), 0, numAtoms, nullptr, GpuApiCallBehavior::Sync, nullptr);
92 copyToDeviceBuffer(&d_xp, (float3*)(testData->xPrime_.data()), 0, numAtoms, nullptr, GpuApiCallBehavior::Sync, nullptr);
95 copyToDeviceBuffer(&d_v, (float3*)(testData->v_.data()), 0, numAtoms, nullptr, GpuApiCallBehavior::Sync, nullptr);
97 lincsCuda->apply(d_x, d_xp,
98 updateVelocities, d_v, testData->invdt_,
99 testData->computeVirial_, testData->virialScaled_);
101 copyFromDeviceBuffer((float3*)(testData->xPrime_.data()), &d_xp, 0, numAtoms, nullptr, GpuApiCallBehavior::Sync, nullptr);
102 if (updateVelocities)
104 copyFromDeviceBuffer((float3*)(testData->v_.data()), &d_v, 0, numAtoms, nullptr, GpuApiCallBehavior::Sync, nullptr);
107 freeDeviceBuffer(&d_x);
108 freeDeviceBuffer(&d_xp);
109 freeDeviceBuffer(&d_v);