On Wed, Mar 8, 2017 at 2:30 PM, Alvaro Herrera <alvhe...@2ndquadrant.com> wrote:
> Not really -- it's a bit slower actually in a synthetic case measuring
> exactly the slowed-down case.  See
> https://www.postgresql.org/message-id/cad__ougk12zqmwwjzim-yyud1y8jmmy6x9yectnif3rpp6h...@mail.gmail.com
> I bet in normal cases it's unnoticeable.  If WARM flies, then it's going
> to provide a larger improvement than is lost to this.

Hmm, that test case isn't all that synthetic.  It's just a single
column bulk update, which isn't anything all that crazy, and 5-10%
isn't nothing.

I'm kinda surprised it made that much difference, though.

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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