| From: | Amit Langote <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> |
|---|---|
| To: | "Imai, Yoshikazu" <imai(dot)yoshikazu(at)jp(dot)fujitsu(dot)com>, "'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 02:33:40 |
| Message-ID: | d964510e-2eec-ce42-8ad8-884caf718e03@lab.ntt.co.jp |
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| Lists: | pgsql-hackers |
Imai-san,
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?
Thanks,
Amit
[1]
https://www.postgresql.org/message-id/a49372b6-c044-4ac8-84ea-90ad18b1770d%40lab.ntt.co.jp
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