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Reduce prefetch SM usage when using pipeline prefetching (#2991)
Summary: Pull Request resolved: #2991 This diff limits the SM usage on `masked_index_put` and `masked_index_get` when pipeline prefetching is used by using a small grid size. This is to reduce the interference of these kernels with the kernels on the compute stream during prefetch. The grid size is currently set to 1/8 of the total number of SMs. However, this number has to be tuned. Differential Revision: D61145930
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