| From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
|---|---|
| To: | "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com> |
| Cc: | Erik Rijkers <er(at)xs4all(dot)nl>, Michael Paquier <michael(at)paquier(dot)xyz>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Tomas Vondra <tomas(dot)vondra(at)2ndquadrant(dot)com>, Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Robert Haas <robertmhaas(at)gmail(dot)com>, PostgreSQL Hackers <pgsql-hackers(at)lists(dot)postgresql(dot)org> |
| Subject: | Re: Schema variables - new implementation for Postgres 15 |
| Date: | 2021-04-15 16:11:40 |
| Message-ID: | CAFj8pRCvBjJHCndafacvcfif-sFKEO40gQf=souNS+pbho7eJw@mail.gmail.com |
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| Lists: | pgsql-hackers |
čt 15. 4. 2021 v 18:02 odesílatel tsunakawa(dot)takay(at)fujitsu(dot)com <
tsunakawa(dot)takay(at)fujitsu(dot)com> napsal:
> From: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
>
> --------------------------------------------------
>
> do $$
>
> declare x int ;
>
> begin
>
> for i in 1..1000000
>
> loop
>
> let ooo = i;
>
> end loop;
>
> end;
>
> $$;
>
>
>
> variant 1 .. 1500 ms
>
> variant 2 with PLpgSQL support .. 140 ms
>
> variant 2 without PLpgSQL support 9000 ms
>
> --------------------------------------------------
>
>
>
>
>
> That's impressive! But 1 million times of variable assignment took only
> 140 ms? It's that one assignment took only 140 nanosecond, which is near
> one DRAM access? Can PL/pgSQL processing be really so fast?
>
In this case the PLpgSQL can be very fast - and after changes in pg 13, the
PLpgSQL is not significantly slower than Lua or than PHP.
Every body can repeat these tests - I did it on my Lenovo T520 notebook
Pavel
>
>
>
> Regards
>
> Takayuki Tsunakawa
>
>
>
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