From: Marc Cousin <mcousin@sigma.fr>
To: pgsql-admin@postgresql.org
Subject: plpgsql function seems to be leaking memory
Date: Tue, 24 Jun 2008 10:56:29 +0200
Message-ID: <200806241056.29589.mcousin@sigma.fr> (raw)
Hi,
I'm having a problem with plpgsql functions leaking memory.
I've reproduced the problem with this simple function here :
CREATE OR REPLACE FUNCTION ftest()
RETURNS boolean AS
$BODY$BEGIN
INSERT INTO test2 values (1);
RETURN true;
END;$BODY$
LANGUAGE 'plpgsql' VOLATILE;
test2 table is a one column table
CREATE TABLE test2
(
id integer
)
WITH (OIDS=FALSE);
Then to see the leak, I've called it repeatedly with a perl program :
#!/usr/bin/perl -w
#
#
use DBI;
$dbh = DBI->connect("dbi:Pg:dbname=test","postgres");
my $statement = 'SELECT ftest ()';
$sth = $dbh->prepare($statement);
$dbh->begin_work();
for ($i=0;$i<1000000;$i++)
{
$sth->execute();
}
$dbh->rollback();
I see the postgresql process growing from 8MB to about 400 MB during this
run...
It only seems to happen when a function contains an insert statement (I don't
see leaks when only selecting).
logs=# SELECT version();
version
------------------------------------------------------------------------------------
PostgreSQL 8.3.3 on x86_64-pc-linux-gnu, compiled by GCC cc (Debian 4.3.1-1)
4.3.1
(1 row)
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To: pgsql-admin@postgresql.org
Cc: mcousin@sigma.fr
Subject: Re: plpgsql function seems to be leaking memory
In-Reply-To: <200806241056.29589.mcousin@sigma.fr>
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