From: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> |
---|---|
To: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
Cc: | Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
Subject: | Re: parallel vacuum - few questions on docs, comments and code |
Date: | 2021-05-12 04:17:58 |
Message-ID: | CAA4eK1KXCdL+3fkHqnaK++s4Kkgr+2gVZ3k5v1FHmJNpGX6h-Q@mail.gmail.com |
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On Tue, May 11, 2021 at 6:31 PM Justin Pryzby <pryzby(at)telsasoft(dot)com> wrote:
>
> On Tue, May 11, 2021 at 05:37:50PM +0530, Bharath Rupireddy wrote:
> > 3) Should the Assert(nindexes > 0); in begin_parallel_vacuum just be
> > Assert(nindexes > 1); as this function is entered only when indexes
> > are > 1?
>
> I think you're right, at least with the current implementation that
> parallelization is done across indexes. Same in parallel_vacuum_main.
>
Yeah, as code stands both of you are right. However, it can be helpful
to test parallelism even with one index say if we implement something
like force_parallel_mode = regress or parallel_leader_participation =
off.
--
With Regards,
Amit Kapila.
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