Re: Hmmm... why does pl/pgsql code parallelise so badly when queries parallelise fine? Anyone else seen this?

On Tue, Jul 7, 2015 at 3:33 PM, Graeme B. Bell <graeme(dot)bell(at)nibio(dot)no> wrote:
>
> Hi Merlin,
>
> Long story short - thanks for the reply, but you're not measuring anything about the parallelism of code running in a pl/pgsql environment here. You're just measuring whether postgres can parallelise entering that environment and get back out. Don't get me wrong - it's great that this scales well because it affects situations where you have lots of calls to trivial functions.
> However it's not the problem I'm talking about. I mean 'real' pl'pgsql functions. e.g. things that you might find in postgis or similar.

Maybe so. But it will be a lot easier for me (and others on this)
list if you submit a self contained test case that runs via pgbench.
From there it's a simple matter of a perf top and other standard
locking diagnostic tests and also rules out any suspicion of 3rd party
issues. This will also get better feedback on -bugs.

merlin