Re: BUG #16223: Performance regression between 11.6 and 12.1 in an SQL query with a recursive CTE based on function

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Christian Schwaderer <schwaderer(at)ivocotec(dot)de>
Cc: pgsql-bugs(at)lists(dot)postgresql(dot)org
Subject: Re: BUG #16223: Performance regression between 11.6 and 12.1 in an SQL query with a recursive CTE based on function
Date: 2020-01-29 15:18:51
Message-ID: 12932.1580311131@sss.pgh.pa.us
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Christian Schwaderer <schwaderer(at)ivocotec(dot)de> writes:
> On 27.01.20 16:31, Tom Lane wrote:
>> Another thing that could be relevant is JIT, which is on by default
>> in v12 (if enabled in configuration), and which is still suffering
>> a lot of teething pains performance-wise. I'd check if that's
>> on and try disabling it if so.

> Anyway: Here are the details of versions and pg_config

I see JIT support (--with-llvm) in those configurations, so
did you heed the above advice?

regards, tom lane

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