COPY FROM : out of memory

Hi list !

When trying to import a 20M rows csv file into PostgreSQL, I
get :

ERROR: out of memory
État SQL :53200
Détail :Failed on request of size 1073741823.
Contexte : COPY tmp, line 1

The table has no index, no trigger, ... :

CREATE TABLE tmp
(
   c1 bigint,
   c2 character varying,
   c3 character varying
)
WITHOUT OIDS;
ALTER TABLE tmp OWNER TO postgres;

The COPY command is very basic :
SET client_encoding TO UTF8;
COPY tmp FROM
'E:\\Production\\Temp\\detailrechercheutf8.csv' CSV;

PostgreSQL version is :
"PostgreSQL 8.1.5 on i686-pc-mingw32, compiled by GCC
gcc.exe (GCC) 3.4.2 (mingw-special)"

I have ~1.5GB of RAM available, and ~4GB of free pagefile space.

Something wrong in my postgresql.conf ? I didn't do much
tweaking though...

Regards
--
Arnaud