Subject: Re: [HACKERS] Small improvement to compactify_tuples
To: Stephen Frost <sfrost@snowman.net>
Cc: Michael Paquier <michael.paquier@gmail.com>, Peter Geoghegan
 <pg@bowt.ie>, Andres Freund <andres@anarazel.de>,
 Tom Lane <tgl@sss.pgh.pa.us>, Claudio Freire <klaussfreire@gmail.com>,
 Robert Haas <robertmhaas@gmail.com>,
 Sokolov Yura <funny.falcon@postgrespro.ru>,
 Alvaro Herrera <alvherre@2ndquadrant.com>,
 Heikki Linnakangas <hlinnaka@iki.fi>,
 PostgreSQL-Dev <pgsql-hackers@postgresql.org>
References: 
 <CAGTBQpZgs4hVmDtHg4F6MDJuAE9-U=z6d+yJzjPsZup7AZhV0Q@mail.gmail.com>
 <22996.1510160560@sss.pgh.pa.us>
 <CAL-rCA3n4Neat4pH382nuZ9v0-SCZOBJ=KHT5CoBGXim=KTAhw@mail.gmail.com>
 <CAL-rCA2cCyvapkb15fADR3qKsRMo+XimPgmGviur1ui-y0q-aQ@mail.gmail.com>
 <CAH2-WznEQBxeij1_PnczUD=vQqS0aPWOxJAkmjH_rXoBpeo0ZQ@mail.gmail.com>
 <CAL-rCA3=MiVU7SWenhPL0a3e5KfOkzvXZDp_WL+ea2Ky57Fqdg@mail.gmail.com>
 <20171128224150.syswowiaiojth7ke@alap3.anarazel.de>
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 <CAL-rCA2n7UfVu1Ui0f+7cVN4vAKVM0+-cZKb_ka6-mGQBAF92w@mail.gmail.com>
 <20180123033429.GF2416@tamriel.snowman.net>
From: Yura Sokolov <funny.falcon@gmail.com>
Message-ID: <9410de56-794b-147f-20f2-d5ef28e98e45@gmail.com>
Date: Sun, 25 Feb 2018 21:39:46 +0300
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From: Yura Sokolov <funny.falcon@gmail.com>
To: Stephen Frost <sfrost@snowman.net>
Cc: Michael Paquier <michael.paquier@gmail.com>, Peter Geoghegan
 <pg@bowt.ie>, Andres Freund <andres@anarazel.de>,
 Tom Lane <tgl@sss.pgh.pa.us>, Claudio Freire <klaussfreire@gmail.com>,
 Robert Haas <robertmhaas@gmail.com>,
 Sokolov Yura <funny.falcon@postgrespro.ru>,
 Alvaro Herrera <alvherre@2ndquadrant.com>,
 Heikki Linnakangas <hlinnaka@iki.fi>,
 PostgreSQL-Dev <pgsql-hackers@postgresql.org>
Message-ID: <9410de56-794b-147f-20f2-d5ef28e98e45@gmail.com>
Subject: Re: [HACKERS] Small improvement to compactify_tuples
References: <CAGTBQpZgs4hVmDtHg4F6MDJuAE9-U=z6d+yJzjPsZup7AZhV0Q@mail.gmail.com>
 <22996.1510160560@sss.pgh.pa.us>
 <CAL-rCA3n4Neat4pH382nuZ9v0-SCZOBJ=KHT5CoBGXim=KTAhw@mail.gmail.com>
 <CAL-rCA2cCyvapkb15fADR3qKsRMo+XimPgmGviur1ui-y0q-aQ@mail.gmail.com>
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 <20180123033429.GF2416@tamriel.snowman.net>
In-Reply-To: <20180123033429.GF2416@tamriel.snowman.net>

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23.01.2018 06:34, Stephen Frost =D0=BF=D0=B8=D1=88=D0=B5=D1=82:
> Greetings,
>=20
> * =D0=AE=D1=80=D0=B8=D0=B9 =D0=A1=D0=BE=D0=BA=D0=BE=D0=BB=D0=BE=D0=B2 (=
funny.falcon@gmail.com) wrote:
>> On Wed, Nov 29, 2017 at 8:00 AM, Peter Geoghegan <pg@bowt.ie> wrote:
>>> On Tue, Nov 28, 2017 at 2:41 PM, Andres Freund <andres@anarazel.de> w=
rote:
>>>> Maybe it's a stupid question. But would we still want to have this a=
fter
>>>> the change? These should be just specializations of the template ver=
sion
>>>> imo.
>>
>> "generic" version operates on bytes, and it will be a bit hard to comb=
ine
>> it with
>> templated version. Not impossible, but it will look ugly.
>=20
> If that's the case then does it really make sense to make this change..=
?

I don't think it is really necessary to implement generic version
through templated. It is much better to replace generic version with
templated in places where it matters for performance.

>=20
>> In attach fixed qsort_template version.
>> And version for compactify_tuples with bucket_sort and templated qsort=
=2E
>=20
> While having the patch is handy, I'm not seeing any performance numbers=

> on this version, and I imagine others watching this thread are also
> wondering about things like a test run that just uses the specialized
> qsort_itemIds() without the bucketsort.
>=20
> Are you planning to post some updated numbers and/or an updated test
> case that hopefully shows best/worst case with this change?  Would be
> good to get that on a couple of platforms too, if possible, since we've=

> seen that the original benchmarks weren't able to be consistently
> repeated across different platforms.  Without someone doing that
> leg-work, this doesn't seem like it'll be moving forward.

Updated numbers are (same benchmark on same notebook, but with new
master, new ubuntu and later patch version) (average among 6 runs):

master               - 16135tps
with templated qsort - 16199tps
with bucket sort     - 16956tps

Difference is still measurable, but less significant. I don't know why.

Rebased version of first patch (qsorted tamplate) is in atttach.

With regards,
Sokolov Yura.

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