| 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 03:01:27 |
| Message-ID: | 72094fc9-3232-0fc7-b7cd-42e1c73d5aee@lab.ntt.co.jp |
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| Lists: | pgsql-hackers |
On 2019/03/20 11:51, Imai, Yoshikazu wrote:
> 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.
Hmm, OK. Can you describe your test setup with more details?
Thanks,
Amit
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