Re: CLUSTER, reform_and_rewrite_tuple(), and parallelism

On Thu, Aug 18, 2016 at 4:42 AM, Peter Geoghegan <pg(at)heroku(dot)com> wrote:
>
> Does anyone have any ideas on how to:
>
> 1). Directly address the reform_and_rewrite_tuple() bottleneck.
>
> and/or:
>
> 2). Push down some or all of the reform_and_rewrite_tuple() work till
> before tuples are passed to the tuplesort.
>
> "2" would probably make it straightforward to have
> reform_and_rewrite_tuple() work occur in parallel workers instead,
> which buys us a lot.
>

I am not aware what exactly you have in mind to parallelize Cluster
command, but anything that is CPU intensive is probably a good bet to
push down to workers (provided it is safe).

--
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com