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35 /*! \libinternal \file
37 * \brief Declaration of high-level functions of GPU implementation of update and constrain class.
39 * \author Artem Zhmurov <zhmurov@gmail.com>
41 * \ingroup module_mdlib
44 #ifndef GMX_MDLIB_UPDATE_CONSTRAIN_GPU_H
45 #define GMX_MDLIB_UPDATE_CONSTRAIN_GPU_H
47 #include "gromacs/gpu_utils/devicebuffer_datatype.h"
48 #include "gromacs/mdtypes/group.h"
49 #include "gromacs/utility/arrayref.h"
50 #include "gromacs/utility/classhelpers.h"
53 class GpuEventSynchronizer;
56 enum class PbcType : int;
57 class InteractionDefinitions;
65 class UpdateConstrainGpu
69 /*! \brief Create Update-Constrain object.
71 * The constructor is given a non-nullptr \p commandStream, in which all the update and constrain
72 * routines are executed. \p xUpdatedOnDevice should mark the completion of all kernels that modify
73 * coordinates. The event is maintained outside this class and also passed to all (if any) consumers
74 * of the updated coordinates. The \p xUpdatedOnDevice also can not be a nullptr because the
75 * markEvent(...) method is called unconditionally.
77 * \param[in] ir Input record data: LINCS takes number of iterations and order of
79 * \param[in] mtop Topology of the system: SETTLE gets the masses for O and H atoms
80 * and target O-H and H-H distances from this object.
81 * \param[in] deviceContext GPU device context.
82 * \param[in] commandStream GPU stream to use. Can be nullptr.
83 * \param[in] xUpdatedOnDevice The event synchronizer to use to mark that update is done on the GPU.
85 UpdateConstrainGpu(const t_inputrec& ir,
86 const gmx_mtop_t& mtop,
87 const DeviceContext& deviceContext,
88 const void* commandStream,
89 GpuEventSynchronizer* xUpdatedOnDevice);
91 ~UpdateConstrainGpu();
95 * This will extract temperature scaling factors from tcstat, transform them into the plain
96 * array and call the normal integrate method.
98 * \param[in] fReadyOnDevice Event synchronizer indicating that the forces are
99 * ready in the device memory.
100 * \param[in] dt Timestep.
101 * \param[in] updateVelocities If the velocities should be constrained.
102 * \param[in] computeVirial If virial should be updated.
103 * \param[out] virial Place to save virial tensor.
104 * \param[in] doTemperatureScaling If velocities should be scaled for temperature coupling.
105 * \param[in] tcstat Temperature coupling data.
106 * \param[in] doParrinelloRahman If current step is a Parrinello-Rahman pressure coupling step.
107 * \param[in] dtPressureCouple Period between pressure coupling steps.
108 * \param[in] prVelocityScalingMatrix Parrinello-Rahman velocity scaling matrix.
110 void integrate(GpuEventSynchronizer* fReadyOnDevice,
112 bool updateVelocities,
115 bool doTemperatureScaling,
116 gmx::ArrayRef<const t_grp_tcstat> tcstat,
117 bool doParrinelloRahman,
118 float dtPressureCouple,
119 const matrix prVelocityScalingMatrix);
121 /*! \brief Scale coordinates on the GPU for the pressure coupling.
123 * After pressure coupling step, the box size may change. Hence, the coordinates should be
124 * scaled so that all the particles fit in the new box.
126 * \param[in] scalingMatrix Coordinates scaling matrix.
128 void scaleCoordinates(const matrix scalingMatrix);
130 /*! \brief Set the pointers and update data-structures (e.g. after NB search step).
132 * \param[in,out] d_x Device buffer with coordinates.
133 * \param[in,out] d_v Device buffer with velocities.
134 * \param[in] d_f Device buffer with forces.
135 * \param[in] idef System topology
136 * \param[in] md Atoms data.
137 * \param[in] numTempScaleValues Number of temperature scaling groups. Zero for no temperature scaling.
139 void set(DeviceBuffer<RVec> d_x,
140 DeviceBuffer<RVec> d_v,
141 DeviceBuffer<RVec> d_f,
142 const InteractionDefinitions& idef,
144 int numTempScaleValues);
149 * Converts PBC data from t_pbc into the PbcAiuc format and stores the latter.
151 * \param[in] pbcType The type of the periodic boundary (Xyz, NO, XY or Screw).
152 * \param[in] box The periodic boundary box matrix.
154 void setPbc(PbcType pbcType, const matrix box);
156 /*! \brief Return the synchronizer associated with the event indicated that the coordinates are ready on the device.
158 GpuEventSynchronizer* getCoordinatesReadySync();
161 * Returns whether the maximum number of coupled constraints is supported
162 * by the GPU LINCS code.
164 * \param[in] mtop The molecular topology
166 static bool isNumCoupledConstraintsSupported(const gmx_mtop_t& mtop);
170 gmx::PrivateImplPointer<Impl> impl_;
175 #endif // GMX_MDLIB_UPDATE_CONSTRAIN_GPU_H