Re: PostgreSQL 14.4 ERROR: out of memory issues

Hello,

thanks for the information and the link!

Ales

čt 4. 8. 2022 v 1:05 odesílatel Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> napsal:

> =?UTF-8?B?QWxlxaEgWmVsZW7DvQ==?= <zeleny(dot)ales(at)gmail(dot)com> writes:
> > CREATE OR REPLACE FUNCTION tescase (_id_data_provider integer,
> _external_id
> > bigint DEFAULT NULL::bigint, _external_complete_id character varying
> > DEFAULT NULL::character varying)
> > RETURNS TABLE(id_gm bigint, id_opp bigint, id_opp_state integer)
> > LANGUAGE sql
> > AS $function$
> > SELECT ... simple join of two tables...
> > WHERE opd.id_data_provider = _id_data_provider
> > AND CASE WHEN _external_id IS NULL
> > THEN external_id IS NULL
> > ELSE external_id = _external_id
> > END
> > AND CASE WHEN _external_complete_id IS NULL
> > THEN _external_complete_id IS NULL
> > ELSE external_complete_id = _external_complete_id
> > END;
> > $function$
> > ;
>
> > It is a kind of creative construct for me, but it works. The key here is
> > that if I replace at least one of the "CASEd" where conditions, it seems
> > not to suffer from the memory leak issue.
>
> > Finally, I've found, that even having the function as is and before the
> > test disabling JIT (SET jit = off;) and calling the function 100k times,
> > RssAnon memory for the given process is stable and only 3612 kB, while
> when
> > JIT is enabled (the default setting on the server suffering from the
> memory
> > leak, RssAnon memory for the given process growth in a linear manner over
> > time (canceled when it reached 5GB).
>
> Ah. I bet this is another instance of the known memory leakage problems
> with JIT inlining [1]. Per Andres' comments in that thread, it seems
> hard to solve properly. For now all I can recommend is to disable that.
>
> regards, tom lane
>
> [1]
> https://www.postgresql.org/message-id/flat/20201001021609.GC8476%40telsasoft.com
>