| From: | Peter Geoghegan <pg(at)heroku(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | 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: | 2016-12-06 21:27:14 |
| Message-ID: | CAM3SWZR4OwHJrcZ+Us-=mx6BnPAWAfA4pZcLU78kjHA7DvVm0A@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Mon, Dec 5, 2016 at 7:49 PM, Andres Freund <andres(at)anarazel(dot)de> wrote:
> I tried to address 2) by changing the C implementation. That brings some
> measurable speedups, but it's not huge. A bigger speedup is making
> slot_getattr, slot_getsomeattrs, slot_getallattrs very trivial wrappers;
> but it's still not huge. Finally I turned to just-in-time (JIT)
> compiling the code for tuple deforming. That doesn't save the cost of
> 1), but it gets rid of most of 2) (from ~15% to ~3% in TPCH-Q01). The
> first part is done in 0008, the JITing in 0012.
A more complete motivating example would be nice. For example, it
would be nice to see the overall speedup for some particular TPC-H
query.
--
Peter Geoghegan
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