| From: | "Imai, Yoshikazu" <imai(dot)yoshikazu(at)jp(dot)fujitsu(dot)com> |
|---|---|
| To: | 'Amit Langote' <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp>, 'Amit Langote' <amitlangote09(at)gmail(dot)com> |
| Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org>, Jesper Pedersen <jesper(dot)pedersen(at)redhat(dot)com> |
| Subject: | RE: speeding up planning with partitions |
| Date: | 2019-03-20 02:51:10 |
| Message-ID: | 0F97FA9ABBDBE54F91744A9B37151A512B359C@g01jpexmbkw24 |
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| Lists: | pgsql-hackers |
Amit-san,
On Wed, Mar 20, 2019 at 2:34 AM, Amit Langote wrote:
> On 2019/03/20 11:21, Imai, Yoshikazu wrote:
> > (4)
> > We expect the performance does not depend on the number of partitions
> after applying all patches, if possible.
> >
> > num of part TPS
> > ----------- -----
> > 1024 7,257 (7274, 7246, 7252)
> > 2048 6,718 (6627, 6780, 6747)
> > 4096 6,472 (6434, 6565, 6416) (quoted from above (3)'s results)
> > 8192 6,008 (6018, 5999, 6007)
> >
> > It seems the performance still depend on the number of partitions. At
> the moment, I don't have any idea what cause this problem but can we improve
> this more?
>
> I've noticed [1] this kind of degradation when the server is built with
> Asserts enabled. Did you?
> ...
> [1]
> https://www.postgresql.org/message-id/a49372b6-c044-4ac8-84ea-90ad18
> b1770d%40lab.ntt.co.jp
No. I did test again from configuring without --enable-cassert but problem I mentioned still happens.
--
Yoshikazu Imai
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