Re: [HACKERS] Performance degradation in TPC-H Q18 - Mailing list pgsql-hackers

From Andres Freund
Subject Re: [HACKERS] Performance degradation in TPC-H Q18
Date
Msg-id 20170301040832.6bx7kk4dcmzserk4@alap3.anarazel.de
Whole thread Raw
In response to Re: [HACKERS] Performance degradation in TPC-H Q18  (Kuntal Ghosh <kuntalghosh.2007@gmail.com>)
Responses Re: [HACKERS] Performance degradation in TPC-H Q18  (Kuntal Ghosh <kuntalghosh.2007@gmail.com>)
List pgsql-hackers
Hi,

On 2017-03-01 09:33:07 +0530, Kuntal Ghosh wrote:
> On Wed, Mar 1, 2017 at 9:19 AM, Andres Freund <andres@anarazel.de> wrote:
> >> So, I was looking for other alternatives and I've found one called
> >> RobinHood hashing.
> >
> > simplehash.h implements robin hood hashing.

> But, it doesn't implement the swapping idea, right?

It does, that's the if (insertdist > curdist) block in SH_INSERT.
Unless I misunderstand what you're proposing?

- Andres



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