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CUDA C/C++ Streams and Concurrency - Nvidia

cuda C/C++ Streams and ConcurrencySteve RennichNVIDIAC oncurrencyThe ability to perform multiple cuda operations simultaneously(beyond multi-threaded parallelism) cuda Kernel <<<>>>cudaMemcpyAsync (HostToDevice)cudaMemcpyAsync (DeviceToHost)Operations on the CPUF ermi architecture can simultaneously support(compute capability +)Up to 16 cuda kernels on GPU2 cudaMemcpyAsyncs (must be in different directions)Computation on the CPUS treamsStreamA sequence of operations that execute in issue-order on the GPUP rogramming model used to effect concurrencyCUDA operations in different Streams may run concurrentlyCUDA operations from different Streams may be interleavedK1K2K3K4 Concurrency ExampleSerialConcurrent overlap kernel and D2H copycudaMemcpyAsync(H2D)cudaMemcpyAsync( D2H)Kernel<<<>>>timecudaMemcpyAsync(H2D) performance improvementstreamsHD2K2HD3DH2 Amount of ConcurrencySerial (1x)2-way Concurrency (up)

CUDA kernels may be executed concurrently if they are in different streams Threadblocks for a given kernel are scheduled if all threadblocks for preceding kernels have been scheduled and there still are SM resources available Note a blocked operation blocks all other operations in the queue, even in other streams ...

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  Master, Concurrency, Cuda, Cuda c, Streams and concurrency

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