> > I already did some benchmarks with GPU sorting (not in pgsql), and > measured total sort times, copy bandwidth and energy usage, and got > some exciting results: Was that qsort implementation on CPU cache friendly and optimized for SSE ? To make a fair comparison you have to take the best CPU implementation and compare it to best GPU implementation. Because if not, you are comparing full throttled GPU vs lazy CPU. Check this paper on how hash join was optimized 17x when SSE instructions were used. www.vldb.org/pvldb/2/vldb09-257.pdf
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