Re: pgsql: Add parallel-aware hash joins.

On Mon, Jan 22, 2018 at 11:17 PM, Thomas Munro
<thomas.munro@enterprisedb.com> wrote:
> It looks to me like longfin's average and
> variation increased half way between fa330f9a and 18042840, somewhere
> near Dec 7 to 9, when we went from ~40s +/- 1 to ~50s with several
> seconds' variation.  Was there some other environmental change then on
> that machine?

Ahh.  That corresponds to the release of this patch:

https://support.apple.com/en-nz/HT208331

And indeed I see from the logs that the kernel changed:

uname -v = Darwin Kernel Version 17.2.0: Fri Sep 29 18:27:05 PDT 2017;
root:xnu-4570.20.62~3/RELEASE_X86_64
uname -v = Darwin Kernel Version 17.3.0: Thu Nov  9 18:09:22 PST 2017;
root:xnu-4570.31.3~1/RELEASE_X86_64

-- 
Thomas Munro
http://www.enterprisedb.com