Re: [RFC] Change the default of update_process_title to off

On Wed, Aug 24, 2016 at 4:35 AM, Tsunakawa, Takayuki <
tsunakawa(dot)takay(at)jp(dot)fujitsu(dot)com> wrote:

> From: Peter Geoghegan [mailto:pg(at)heroku(dot)com]
> > On Tue, Aug 23, 2016 at 1:44 PM, Bruce Momjian <bruce(at)momjian(dot)us> wrote:
> > >> [Windows]
> > >> #clients on off
> > >> 12 29793 38169
> > >> 24 31587 87237
> > >> 48 32588 83335
> > >> 96 34261 67668
> > >
> > > This ranges from a 28% to a 97% speed improvement on Windows! Those
> > > are not typos! This is a game-changer for use of Postgres on Windows
> > > for certain workloads!
> >
> > While I don't care all that much about performance on windows, it is a
> little
> > sad that it took this long to fix something so simple. Consider this
> exchange,
> > as a further example of our lack of concern here:
> >
> > https://www.postgresql.org/message-id/30619.1428157653@sss.pgh.pa.us
>
> Probably, the useful Windows Performance Toolkit, which is a counterpart
> of perf on Linux, was not available before. Maybe we can dig deeper into
> performance problems with it now.
>
> As a similar topic, I wonder whether the following still holds true, after
> many improvements on shared buffer lock contention.
>
> https://www.postgresql.org/docs/devel/static/runtime-config-resource.html
>
> "The useful range for shared_buffers on Windows systems is
> generally from 64MB to 512MB."
>
>
Yes, that may very much be out of date as well. A good set of benchmarks
around that would definitely be welcome.

--
Magnus Hagander
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