From: | Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com> |
---|---|
To: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
Subject: | calling procedures is slow and consumes extra much memory against calling function |
Date: | 2020-05-10 20:20:53 |
Message-ID: | CAFj8pRDiiU1dqym+_P4_GuTWm76knJu7z9opWayBJTC0nQGUUA@mail.gmail.com |
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Lists: | pgsql-hackers |
Hi
I try to use procedures in Orafce package, and I did some easy performance
tests. I found some hard problems:
1. test case
create or replace procedure p1(inout r int, inout v int) as $$
begin v := random() * r; end
$$ language plpgsql;
This command requires
do $$
declare r int default 100; x int;
begin
for i in 1..300000 loop
call p1(r, x);
end loop;
end;
$$;
about 2.2GB RAM and 10 sec.
When I rewrite same to functions then
create or replace function p1func2(inout r int, inout v int) as $$
begin v := random() * r; end
$$ language plpgsql;
do $$
declare r int default 100; x int; re record;
begin
for i in 1..300000 loop
re := p1func2(r, x);
end loop;
end;
$$;
Then execution is about 1 sec, and memory requirements are +/- zero.
Minimally it looks so CALL statements has a memory issue.
Regards
Pavel
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