Improve Primitives a Little Bit #2001
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CUDA: Replace thrust::reduce with CUB DeviceReduce::Sum in primitives::sum
Summary
Inspired by this conversation here NVIDIA/cccl#520
This PR replaces the CUDA implementation of primitivesDevice::CUDA::sum from thrust::reduce to cub::DeviceReduce::Sum with cudaMallocAsync/cudaFreeAsync for temporary storage. No interfaces change. No other code paths are modified.
The underlying GPU reduction kernel is the same family of CUB kernels Thrust would eventually dispatch to, but this change removes framework overhead.
This PR intentionally changes only "sum." Other Thrust-based reductions can be migrated if desired, such as for "max," "max_element," "logsumexp" or what not to CUB.
Hope this helps! I can provide some benchmarks if you want.