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