| From: | CK Tan <cktan(at)vitessedata(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Peter Geoghegan <pg(at)heroku(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Heikki Linnakangas <hlinnaka(at)iki(dot)fi>, Doug Doole <ddoole(at)salesforce(dot)com> |
| Subject: | Re: WIP: Faster Expression Processing and Tuple Deforming (including JIT) |
| Date: | 2016-12-13 02:29:42 |
| Message-ID: | CAJNt7=aO5ceq4_T3wm-cybbv=Ncw7JXpfpJ45i=TLL6Qq5pdVA@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Dec 12, 2016 at 6:14 PM, Andres Freund <andres(at)anarazel(dot)de> wrote:
>
>
> For Q1 I think the bigger win is JITing the transition function
> invocation in advance_aggregates/transition_function - that's IIRC where
> the biggest bottleneck lies.
>
Yeah, we bundle the agg core into our expr work... no point otherwise since
we do
it for OLAP.
As for experience, I think you have found out for yourself. There is a lot
that
can be done and heuristics are involved in many places to decide whether
to jit fully, partially, or not at all. But it looks like you have a solid
basis now
to proceed and explore the beyond :-)
Send me private email if you have a particular question.
Regards,
-cktan
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