2 * This file is part of the GROMACS molecular simulation package.
4 * Copyright (c) 2018,2019,2020,2021, 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.
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.
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.
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.
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.
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.
35 /*! \libinternal \file
36 * \brief Implements a DeviceEvent class for CUDA.
38 * \author Aleksei Iupinov <a.yupinov@gmail.com>
39 * \author Andrey Alekseenko <al42and@gmail.com>
42 #ifndef GMX_GPU_UTILS_DEVICE_EVENT_CUH
43 #define GMX_GPU_UTILS_DEVICE_EVENT_CUH
45 #include "gromacs/gpu_utils/cudautils.cuh"
46 #include "gromacs/gpu_utils/device_stream.h"
47 #include "gromacs/gpu_utils/gputraits.cuh"
48 #include "gromacs/utility/gmxassert.h"
57 cudaError_t stat = cudaEventCreateWithFlags(&event_, cudaEventDisableTiming);
58 if (stat != cudaSuccess)
60 GMX_THROW(gmx::InternalError("cudaEventCreate failed: " + gmx::getDeviceErrorString(stat)));
63 ~DeviceEvent() { cudaEventDestroy(event_); }
64 // Disable copy, move, and assignment. Move can be allowed, but not needed yet.
65 DeviceEvent& operator=(const DeviceEvent&) = delete;
66 DeviceEvent(const DeviceEvent&) = delete;
67 DeviceEvent& operator=(DeviceEvent&&) = delete;
68 DeviceEvent(DeviceEvent&&) = delete;
70 /*! \brief Marks the synchronization point in the \p stream.
71 * Should be followed by waitForEvent().
73 inline void mark(const DeviceStream& deviceStream)
75 cudaError_t stat = cudaEventRecord(event_, deviceStream.stream());
76 if (stat != cudaSuccess)
78 GMX_THROW(gmx::InternalError("cudaEventRecord failed: " + gmx::getDeviceErrorString(stat)));
81 //! Synchronizes the host thread on the marked event.
84 cudaError_t gmx_used_in_debug stat = cudaEventSynchronize(event_);
85 if (stat != cudaSuccess)
87 GMX_THROW(gmx::InternalError("cudaEventSynchronize failed: " + gmx::getDeviceErrorString(stat)));
90 //! Checks the completion of the underlying event.
93 cudaError_t stat = cudaEventQuery(event_);
94 if (stat != cudaSuccess && stat != cudaErrorNotReady)
96 GMX_THROW(gmx::InternalError("cudaEventQuery failed: " + gmx::getDeviceErrorString(stat)));
98 return (stat == cudaSuccess);
100 //! Enqueues a wait for the recorded event in stream \p stream
101 inline void enqueueWait(const DeviceStream& deviceStream)
103 cudaError_t stat = cudaStreamWaitEvent(deviceStream.stream(), event_, 0);
104 if (stat != cudaSuccess)
106 GMX_THROW(gmx::InternalError("cudaStreamWaitEvent failed: " + gmx::getDeviceErrorString(stat)));
109 //! Reset the event (not needed in CUDA)
110 inline void reset() {}