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Re: Seeking reason behind performance gain in 12 with HashAggregate - Mailing list pgsql-performance

From Justin Pryzby
Subject Re: Seeking reason behind performance gain in 12 with HashAggregate
Date
Msg-id 20200113164220.GH26045@telsasoft.com
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In response to Seeking reason behind performance gain in 12 with HashAggregate  (Shira Bezalel <shira@sfei.org>)
Responses Re: Seeking reason behind performance gain in 12 with HashAggregate  (Shira Bezalel <shira@sfei.org>)
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On Mon, Jan 13, 2020 at 08:29:05AM -0800, Shira Bezalel wrote:
> Here is the EXPLAIN (ANALYZE ON, BUFFERS ON) output from both systems:
> 
> 9.6 plan <https://explain.depesz.com/s/W8HN>
> 12.1 plan <https://explain.depesz.com/s/lIRS>

> Is there something that was changed/improved in either 10, 11 or 12 that this
> behavior can be attributed to?

v12 has JIT enabled by default.
You can test if that's significant with SET jit=off.

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