| From: | reid(dot)thompson(at)crunchydata(dot)com |
|---|---|
| To: | Arne Roland <A(dot)Roland(at)index(dot)de>, Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | vignesh C <vignesh21(at)gmail(dot)com>, "pgsql-hackers(at)lists(dot)postgresql(dot)org" <pgsql-hackers(at)lists(dot)postgresql(dot)org>, Justin Pryzby <pryzby(at)telsasoft(dot)com>, Ibrar Ahmed <ibrar(dot)ahmad(at)gmail(dot)com>, "stephen(dot)frost" <stephen(dot)frost(at)crunchydata(dot)com> |
| Subject: | Re: Add the ability to limit the amount of memory that can be allocated to backends. |
| Date: | 2023-05-18 03:07:03 |
| Message-ID: | 94184680049d6bda0c85f1759af24d8127cfe895.camel@crunchydata.com |
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| Lists: | pgsql-hackers |
On Wed, 2023-04-19 at 23:28 +0000, Arne Roland wrote:
> > Thank you! I just tried our benchmark and got a performance
> > degration > of around 28 %, which is way better than the last
> > patch.
> >
> > The simple query select * from generate_series(0, 10000000) shows >
> > roughly 18.9 % degradation on my test server.
> >
> > By raising initial_allocation_allowance and >
> > allocation_allowance_refill_qty I can get it to 16 % degradation.
> > So > most of the degradation seems to be independent from raising
> > the > allowance.
> >
> > I think we probably should investigate this further.
> >
> > Regards
> > Arne
> >
Hi Arne,
Thanks for the feedback.
I'm plannning to look at this.
Is your benchmark something that I could utilize? I.E. is it a set of
scripts or a standard test from somewhere that I can duplicate?
Thanks,
Reid
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