src/gromacs/gpu_utils/gpueventsynchronizer_sycl.h

   1 /*
   2  * This file is part of the GROMACS molecular simulation package.
   3  *
   4  * Copyright (c) 2020, 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.
   8  *
   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.
  13  *
  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.
  18  *
  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.
  23  *
  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.
  31  *
  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.
  34  */
  35 /*! \libinternal \file
  36  *  \brief Implements a GpuEventSynchronizer class for OpenCL.
  37  *
  38  *  \author Aleksei Iupinov <a.yupinov@gmail.com>
  39  * \inlibraryapi
  40  */
  41 #ifndef GMX_GPU_UTILS_GPUEVENTSYNCHRONIZER_OCL_H
  42 #define GMX_GPU_UTILS_GPUEVENTSYNCHRONIZER_OCL_H
  43
  44 #ifndef DOXYGEN
  45
  46 #    include "gromacs/utility/exceptions.h"
  47 #    include "gromacs/utility/gmxassert.h"
  48
  49 /*! \libinternal \brief
  50  * A class which allows for CPU thread to mark and wait for certain GPU stream execution point.
  51  * The event can be put into the stream with markEvent() and then later waited on with waitForEvent().
  52  * This can be repeated as necessary, but the current implementation does not allow waiting on
  53  * completed event more than once, expecting only exact pairs of markEvent(stream); waitForEvent().
  54  * The class generally attempts to track the correctness of its state transitions, but
  55  * please note that calling waitForEvent() right after the construction will fail with OpenCL but succeed with CUDA.
  56  *
  57  * Another possible mode of operation can be implemented if needed:
  58  * multiple calls to waitForEvent() after a single markEvent(). For this, clReleaseEvent() call
  59  * from waitForEvent() should instead happen conditionally at the beginning of markEvent(), replacing
  60  * the GMX_ASSERT(). This was tested to work both with CUDA and NVidia OpenCL, but not with AMD/Intel OpenCl.
  61  */
  62 class GpuEventSynchronizer
  63 {
  64 public:
  65     //! A constructor
  66     GpuEventSynchronizer() {}
  67     //! A destructor
  68     ~GpuEventSynchronizer() {}
  69     //! No copying
  70     GpuEventSynchronizer(const GpuEventSynchronizer&) = delete;
  71     //! No assignment
  72     GpuEventSynchronizer& operator=(GpuEventSynchronizer&&) = delete;
  73     //! Moving is disabled but can be considered in the future if needed
  74     GpuEventSynchronizer(GpuEventSynchronizer&&) = delete;
  75
  76     /*! \brief Marks the synchronization point in the \p stream.
  77      * Should be called first and then followed by waitForEvent().
  78      */
  79     inline void markEvent(const DeviceStream& /* deviceStream */)
  80     {
  81         // SYCL-TODO
  82     }
  83     /*! \brief Synchronizes the host thread on the marked event. */
  84     inline void waitForEvent()
  85     {
  86         // SYCL-TODO
  87     }
  88     /*! \brief Enqueues a wait for the recorded event in stream \p stream
  89      *
  90      *  After enqueue, the associated event is released, so this method should
  91      *  be only called once per markEvent() call.
  92      */
  93     inline void enqueueWaitEvent(const DeviceStream& /* deviceStream */)
  94     {
  95         // SYCL-TODO
  96     }
  97
  98 private:
  99     // SYCL-TODO
 100 };
 101
 102 #endif
 103
 104 #endif