Re: Parallel copy - Mailing list pgsql-hackers

From Robert Haas
Subject Re: Parallel copy
Date
Msg-id CA+TgmoYbo-cW=r6KExQdg7a4PGmkG7=km-4+7dd9fdwteDsx=Q@mail.gmail.com
Whole thread Raw
In response to Re: Parallel copy  (Andres Freund <andres@anarazel.de>)
Responses Re: Parallel copy
List pgsql-hackers
On Fri, Apr 10, 2020 at 2:26 PM Andres Freund <andres@anarazel.de> wrote:
> > Still, it might be the case that having the process that is reading
> > the data also find the line endings is so fast that it makes no sense
> > to split those two tasks. After all, whoever just read the data must
> > have it in cache, and that helps a lot.
>
> Yea. And if it's not fast enough to split lines, then we have a problem
> regardless of which process does the splitting.

Still, if the reader does the splitting, then you don't need as much
IPC, right? The shared memory data structure is just a ring of bytes,
and whoever reads from it is responsible for the rest.

-- 
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company



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