| From: | David Rowley <dgrowleyml(at)gmail(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, Julien Rouhaud <rjuju123(at)gmail(dot)com>, Magnus Hagander <magnus(at)hagander(dot)net>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Add parameter jit_warn_above_fraction |
| Date: | 2022-03-29 23:41:41 |
| Message-ID: | CAApHDvov2Zknd6KOT07YBOG1qGd4DCapAJ48gpa0161R7Sbc_g@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Wed, 30 Mar 2022 at 12:16, Andres Freund <andres(at)anarazel(dot)de> wrote:
> > I did propose a patch to address this in [1]. It does need more work
> > and I do plan to come back to it for v16.
>
> FWIW, that doesn't seem quite right - won't it stop JITing e.g. on the inner
> side of a nested loop, just because it's cheap, even though that's where the
> bulk of the benefits comes from?
Yeah, I think the total cost would need to be multiplied by the number
of times we expect to call that part of the plan. I've not yet sat
down to figure out if that's easy/cheap or hard/costly information to
obtain.
David
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