perf(scan): register-raking items-per-thread GPU prefix scan - #108
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perf(scan): register-raking items-per-thread GPU prefix scan#108shreyas-omkar wants to merge 1 commit into
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Each thread serial-scans its contiguous run of ITEMS elements in registers, the block_size run-totals are scanned once with a Blelloch tree, and each thread folds its exclusive block-prefix back in. A block covers block_size*ITEMS elements without deepening the tree, so raising ITEMS cuts the block count (and the per-block prefix array) at the same barrier cost. Default 2 keeps current behaviour; opt into 4 via `_scan_items_per_thread`. Co-Authored-By: Claude Opus 4.8 <[email protected]>
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