search engine - Why do queries with shorter inverted lists perform better on CPU's when compared to GPU's -
moreover, why queries longer inverted list perform better on gpu's?
i read result in paper called using graphics processors high performance ir querying.
queries longer lists work better on gpus, because gpus highly parallel, , search parallel problem.
however, gpus (and other massively parallel computers) don't process things same way few-core cpus do. other problem, there non-negligible work done set problem gpu. small problem sizes, overhead swamps out speedup provided gpus.
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