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37 * \brief Implements the DeviceStream for CUDA.
39 * \author Artem Zhmurov <zhmurov@gmail.com>
41 * \ingroup module_gpu_utils
45 #include "device_stream.h"
47 #include "gromacs/utility/exceptions.h"
48 #include "gromacs/utility/gmxassert.h"
49 #include "gromacs/utility/stringutil.h"
51 DeviceStream::DeviceStream()
56 void DeviceStream::init(const DeviceContext& /* deviceContext */,
57 DeviceStreamPriority priority,
58 const bool /* useTiming */)
62 if (priority == DeviceStreamPriority::Normal)
64 stat = cudaStreamCreate(&stream_);
65 if (stat != cudaSuccess)
67 GMX_THROW(gmx::InternalError(gmx::formatString(
68 "Could not create CUDA stream (CUDA error %d: %s).", stat, cudaGetErrorString(stat))));
71 else if (priority == DeviceStreamPriority::High)
73 // Note that the device we're running on does not have to
74 // support priorities, because we are querying the priority
75 // range, which in that case will be a single value.
77 stat = cudaDeviceGetStreamPriorityRange(nullptr, &highestPriority);
78 if (stat != cudaSuccess)
80 GMX_THROW(gmx::InternalError(gmx::formatString(
81 "Could not query CUDA stream priority range (CUDA error %d: %s).", stat,
82 cudaGetErrorString(stat))));
85 stat = cudaStreamCreateWithPriority(&stream_, cudaStreamDefault, highestPriority);
86 if (stat != cudaSuccess)
88 GMX_THROW(gmx::InternalError(gmx::formatString(
89 "Could not create CUDA stream with high priority (CUDA error %d: %s).", stat,
90 cudaGetErrorString(stat))));
95 DeviceStream::~DeviceStream()
99 cudaError_t stat = cudaStreamDestroy(stream_);
100 GMX_RELEASE_ASSERT(stat == cudaSuccess,
101 gmx::formatString("Failed to release CUDA stream (CUDA error %d: %s).",
102 stat, cudaGetErrorString(stat))
108 cudaStream_t DeviceStream::stream() const
113 bool DeviceStream::isValid() const
115 return (stream_ != nullptr);
118 void DeviceStream::synchronize() const
120 cudaError_t stat = cudaStreamSynchronize(stream_);
121 GMX_RELEASE_ASSERT(stat == cudaSuccess,
122 gmx::formatString("cudaStreamSynchronize failed (CUDA error %d: %s).", stat,
123 cudaGetErrorString(stat))