| From: | Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com> |
|---|---|
| To: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
| Cc: | Dilip Kumar <dilipbalaut(at)gmail(dot)com>, "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>, vignesh C <vignesh21(at)gmail(dot)com> |
| Subject: | Re: Parallel Inserts in CREATE TABLE AS |
| Date: | 2021-05-27 09:47:01 |
| Message-ID: | CALj2ACUK-UzFrWOETq4HyouMEhwOoxyNgY7HzO-G0g04cuOWcQ@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Thu, May 27, 2021 at 2:26 PM Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> > I think some other cause of contention on relation extension locks are
> > 1. CTAS is using a buffer strategy and due to that, it might need to
> > evict out the buffer frequently for getting the new block in. Maybe
> > we can identify by turning off the buffer strategy for CTAS and
> > increasing the shared buffer so that data fits in memory.
> >
>
> One more thing to ensure is whether all the workers are using the same
> access strategy?
In the Parallel Inserts in CTAS patches, the leader and each worker
uses its own ring buffer of 16MB i.e. does myState->bistate =
GetBulkInsertState(); separately.
With Regards,
Bharath Rupireddy.
EnterpriseDB: http://www.enterprisedb.com
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