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Re:Postgresql 9.6: Support parallel aggregation by pgaddict on Monday March 21, 2016 @06:39PM (#11332772)
David Dowley (one of the authors of the patch) posted some measurements on TPC-H Q1: https://news.ycombinator.com/item?id=11332713

The machine has 4x E5-4620, so 32 physical cores. And with 30 workers it gets ~80% of the theoretical speedup. Not bad, I guess.

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