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A comment on Postgresql 9.6: Support parallel aggregation.

Re:Postgresql 9.6: Support parallel aggregation by pgaddict on Monday March 21, 2016 @06:29PM (#11332704)
FWIW, a simple benchmark by David Rowley (one of the authors of the patch) are here:

http://blog.2ndquadrant.com/parallel-aggregate/

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Re:Postgresql 9.6: Support parallel aggregation by andruby on Tuesday March 22, 2016 @11:05AM (#11337105)
The article claims a near linear speedup for a very large query. On a 64 core machine, the query takes:

1375s with 0 workers

131s with 10 workers

56s with 30 workers

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