src/gromacs/ewald/pme_pp_comm_gpu.h

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  35 /*! \libinternal \file
  36  * \brief Declaration of GPU PME-PP Communication.
  37  *
  38  * \author Alan Gray <alang@nvidia.com>
  39  * \inlibraryapi
  40  * \ingroup module_ewald
  41  */
  42 #ifndef GMX_PME_PP_COMM_GPU_H
  43 #define GMX_PME_PP_COMM_GPU_H
  44
  45 #include "gromacs/utility/classhelpers.h"
  46 #include "gromacs/utility/gmxmpi.h"
  47
  48 class DeviceContext;
  49 class DeviceStream;
  50 class GpuEventSynchronizer;
  51
  52 namespace gmx
  53 {
  54
  55 class DeviceStreamManager;
  56
  57 /*! \libinternal
  58
  59  * \brief Manages communication related to GPU buffers between this
  60  * PME rank and its PP rank. */
  61 class PmePpCommGpu
  62 {
  63
  64 public:
  65     /*! \brief Creates PME-PP GPU communication object
  66      * \param[in] comm            Communicator used for simulation
  67      * \param[in] pmeRank         Rank of PME task
  68      * \param[in] deviceContext   GPU context.
  69      * \param[in] deviceStream    GPU stream.
  70      */
  71     PmePpCommGpu(MPI_Comm comm, int pmeRank, const DeviceContext& deviceContext, const DeviceStream& deviceStream);
  72     ~PmePpCommGpu();
  73
  74     /*! \brief Perform steps required when buffer size changes
  75      * \param[in]  size   Number of elements in buffer
  76      */
  77     void reinit(int size);
  78
  79     /*! \brief
  80      * Pull data from PME GPU directly using CUDA Memory copy.
  81      * \param[out] recvPtr  Buffer to receive PME force data
  82      * \param[in]  recvSize Number of elements to receive
  83      * \param[in] recvPmeForceToGpu Whether receive is to GPU, otherwise CPU
  84      */
  85     void receiveForceFromPmeCudaDirect(void* recvPtr, int recvSize, bool recvPmeForceToGpu);
  86
  87     /*! \brief Push coordinates buffer directly to GPU memory on PME task
  88      * \param[in] sendPtr Buffer with coordinate data
  89      * \param[in] sendSize Number of elements to send
  90      * \param[in] sendPmeCoordinatesFromGpu Whether send is from GPU, otherwise CPU
  91      * \param[in] coordinatesReadyOnDeviceEvent Event recorded when coordinates are available on device
  92      */
  93     void sendCoordinatesToPmeCudaDirect(void*                 sendPtr,
  94                                         int                   sendSize,
  95                                         bool                  sendPmeCoordinatesFromGpu,
  96                                         GpuEventSynchronizer* coordinatesReadyOnDeviceEvent);
  97
  98     /*! \brief
  99      * Return pointer to buffer used for staging PME force on GPU
 100      */
 101     void* getGpuForceStagingPtr();
 102
 103     /*! \brief
 104      * Return pointer to event recorded when forces are ready
 105      */
 106     GpuEventSynchronizer* getForcesReadySynchronizer();
 107
 108 private:
 109     class Impl;
 110     gmx::PrivateImplPointer<Impl> impl_;
 111 };
 112
 113 } // namespace gmx
 114
 115 #endif