| From: | Thomas Munro <thomas(dot)munro(at)enterprisedb(dot)com> |
|---|---|
| To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
| Cc: | Andres Freund <andres(at)anarazel(dot)de>, pgsql-committers <pgsql-committers(at)postgresql(dot)org> |
| Subject: | Re: pgsql: Add parallel-aware hash joins. |
| Date: | 2018-01-22 11:47:17 |
| Message-ID: | CAEepm=1KTKEKW3KBbZwN6Ohh+rhuXjxC_f-F4VHR8Y6UWC=xVQ@mail.gmail.com |
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| Lists: | pgsql-committers pgsql-hackers |
On Mon, Jan 22, 2018 at 11:17 PM, Thomas Munro
<thomas(dot)munro(at)enterprisedb(dot)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
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