Re: Big performance slowdown from 11.2 to 13.3 - Mailing list pgsql-performance

On Thu, Jul 22, 2021 at 09:36:02AM -0700, Peter Geoghegan wrote:
> I don't see how it's possible for get_hash_mem() to be unable to
> return a hash_mem value that could be represented by work_mem
> directly. MAX_KILOBYTES is an annoyingly low limit on Windows, where
> sizeof(long) is 4. But that's nothing new.

Oh.  So the problem seems to be that:

1) In v12, HashAgg now obeyes work_mem*hash_mem_multiplier;
2) Under windows, work_mem is limited to 2GB.

-- 
Justin