| From: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com> |
|---|---|
| To: | Kouhei Kaigai <kaigai(at)ak(dot)jp(dot)nec(dot)com> |
| Cc: | Robert Haas <robertmhaas(at)gmail(dot)com>, "pgsql-hackers(at)postgresql(dot)org" <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: asynchronous and vectorized execution |
| Date: | 2016-05-10 05:00:36 |
| Message-ID: | CAKJS1f-TnaeDbC_K8FJTbV=ArRYb+V3sEr-ayvqqYVSNXCXQLQ@mail.gmail.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-hackers |
On 10 May 2016 at 13:38, Kouhei Kaigai <kaigai(at)ak(dot)jp(dot)nec(dot)com> wrote:
> My concern about ExecProcNode is, it is constructed with a large switch
> ... case statement. It involves tons of comparison operation at run-time.
> If we replace this switch ... case by function pointer, probably, it make
> performance improvement. Especially, OLAP workloads that process large
> amount of rows.
I imagined that any decent compiler would have built the code to use
jump tables for this. I have to say that I've never checked to make
sure though.
--
David Rowley http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
| From | Date | Subject | |
|---|---|---|---|
| Next Message | Kouhei Kaigai | 2016-05-10 05:47:16 | Re: asynchronous and vectorized execution |
| Previous Message | David G. Johnston | 2016-05-10 04:34:57 | Re: between not propated into a simple equality join |