Peter,
I wonder whether platforms with INT64_IS_BROKEN can address more than 2GB of memory anyway.
To be quite frank, current PostgreSQL can't effectively use more than 256mb of work_mem anyway. We'd like to fix that, but it's not fixed yet AFAIK.
--Josh ---------------------------(end of broadcast)--------------------------- TIP 3: Have you checked our extensive FAQ? http://www.postgresql.org/docs/faq