| From: | Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com> |
|---|---|
| To: | "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com> |
| Cc: | "houzj(dot)fnst(at)fujitsu(dot)com" <houzj(dot)fnst(at)fujitsu(dot)com>, "tanghy(dot)fnst(at)fujitsu(dot)com" <tanghy(dot)fnst(at)fujitsu(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Zhihong Yu <zyu(at)yugabyte(dot)com>, Luc Vlaming <luc(at)swarm64(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Subject: | Re: Parallel Inserts in CREATE TABLE AS |
| Date: | 2021-05-27 07:41:27 |
| Message-ID: | CALj2ACUos3kSMzqJvWBGBgRaA8kuiz9eLddB0dZ93AO06CkC3w@mail.gmail.com |
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On Thu, May 27, 2021 at 1:03 PM tsunakawa(dot)takay(at)fujitsu(dot)com
<tsunakawa(dot)takay(at)fujitsu(dot)com> wrote:
>
> From: houzj(dot)fnst(at)fujitsu(dot)com <houzj(dot)fnst(at)fujitsu(dot)com>
> > Although, the 4 workers case still has performance degradation compared to
> > serial case.
> >
> > SERIAL: 58759.213 ms
> > PARALLEL 2 WORKER [NOT SKIP FSM]: 68390.221 ms [SKIP FSM]:
> > 58633.924 ms
> > PARALLEL 4 WORKER [NOT SKIP FSM]: 67448.142 ms [SKIP FSM]:
> > 66,960.305 ms
>
> Can you see any difference in table sizes?
Also, the number of pages the table occupies in each case along with
table size would give more insights.
I do as follows to get the number of pages a relation occupies:
CREATE EXTENSION pgstattuple;
SELECT pg_relpages('test');
With Regards,
Bharath Rupireddy.
EnterpriseDB: http://www.enterprisedb.com
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