Re: Parallel query execution

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:
> 
>     https://wiki.postgresql.org/wiki/Parallel_Query_Execution
> 
>     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:
https://wiki.postgresql.org/wiki/Parallel_Query_Execution#Specific_Opportunities

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
 + It's impossible for everything to be true. +