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Re: Parallel query execution

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Paul Ramsey <pramsey(at)cleverelephant(dot)ca>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Parallel query execution
Date: 2013-01-24 23:17:18
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Lists: pgsql-hackers
On Thu, Jan 24, 2013 at 02:34:49PM -0800, Paul Ramsey wrote:
> On Tuesday, January 15, 2013 at 2:14 PM, Bruce Momjian wrote:
>     I mentioned last year that I wanted to start working on parallelism:
>     I believe it is time to start adding parallel execution to the backend.
>     We already have some parallelism in the backend:
>     effective_io_concurrency and helper processes. I think it is time we
>     start to consider additional options
>     Parallelism isn't going to help all queries, in fact it might be just a
>     small subset, but it will be the larger queries. The pg_upgrade
>     parallelism only helps clusters with multiple databases or tablespaces,
>     but the improvements are significant.
> I just got out of a meeting that included Oracle Spatial folks, who
> were boasting of big performance increases in enabling parallel query
> on their spatial queries. Basically the workloads on things like big
> spatial joins are entirely CPU bound, so they are seeing that adding
> 15 processors makes things 15x faster. Spatial folks would love love
> love to see parallel query execution.

I added PostGIS under the "Expensive Functions" opportunity:

  Bruce Momjian  <bruce(at)momjian(dot)us>

  + It's impossible for everything to be true. +

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