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37 * \brief Implements PME-PP communication using CUDA
40 * \author Alan Gray <alang@nvidia.com>
42 * \ingroup module_ewald
46 #include "pme_force_sender_gpu_impl.h"
50 #include "gromacs/gpu_utils/cudautils.cuh"
51 #include "gromacs/gpu_utils/gpueventsynchronizer.cuh"
52 #include "gromacs/utility/gmxmpi.h"
57 /*! \brief Create PME-PP GPU communication object */
58 PmeForceSenderGpu::Impl::Impl(GpuEventSynchronizer* pmeForcesReady,
60 gmx::ArrayRef<PpRanks> ppRanks) :
61 pmeForcesReady_(pmeForcesReady),
67 "PME-PP GPU Communication is currently only supported with thread-MPI enabled");
70 PmeForceSenderGpu::Impl::~Impl() = default;
72 /*! \brief sends force buffer address to PP ranks */
73 void PmeForceSenderGpu::Impl::sendForceBufferAddressToPpRanks(DeviceBuffer<Float3> d_f)
77 for (const auto& receiver : ppRanks_)
80 ind_end = ind_start + receiver.numAtoms;
82 // Data will be transferred directly from GPU.
83 void* sendBuf = reinterpret_cast<void*>(&d_f[ind_start]);
86 MPI_Send(&sendBuf, sizeof(void**), MPI_BYTE, receiver.rankId, 0, comm_);
88 GMX_UNUSED_VALUE(sendBuf);
93 /*! \brief Send PME synchronizer directly using CUDA memory copy */
94 void PmeForceSenderGpu::Impl::sendFToPpCudaDirect(int ppRank)
96 // Data will be pulled directly from PP task
98 // TODO Using MPI_Isend would be more efficient, particularly when
99 // sending to multiple PP ranks
100 MPI_Send(&pmeForcesReady_, sizeof(GpuEventSynchronizer*), MPI_BYTE, ppRank, 0, comm_);
102 GMX_UNUSED_VALUE(pmeSyncPtr);
103 GMX_UNUSED_VALUE(ppRank);
107 PmeForceSenderGpu::PmeForceSenderGpu(GpuEventSynchronizer* pmeForcesReady,
109 gmx::ArrayRef<PpRanks> ppRanks) :
110 impl_(new Impl(pmeForcesReady, comm, ppRanks))
114 PmeForceSenderGpu::~PmeForceSenderGpu() = default;
116 void PmeForceSenderGpu::sendForceBufferAddressToPpRanks(DeviceBuffer<RVec> d_f)
118 impl_->sendForceBufferAddressToPpRanks(d_f);
121 void PmeForceSenderGpu::sendFToPpCudaDirect(int ppRank)
123 impl_->sendFToPpCudaDirect(ppRank);