LMDB usage on windows - to much memory needed

[Frank Offermanns <Frank.Offermanns@caseris.de>]

Hello,

we would like to change our backend
from hdb to mdb.

I did some initial tests and found out
the following:
When setting maxsize to 1.4 GB, the
size of the database on the file system is about 1.4 GB. I thought I read
that the maxsize has nothing to do with the actual physical size needed.
(If I have only 10 MB of data my database should be about 10 MB).
Even worse is the fact, that slapd.exe
then needs about 1.5 GB virtual size memory. 
And if I use 32 Bit slapd.exe the process
will crash when reaching 2 GB virtual size. (as every 32 bit process will
do)

Now my conclusion is, that the things
described in the mdb paper are only valid for unix/linux, because windows
uses another memory system. Is this correct? Or is there a way I haven't
found to configure OpenLDAP on windows so that it does not need so much
RAM. 
The size on the disk does not matter
for us, but since we use only 32 bit slapd.exe the RAM does matter. 

Best regards,
Frank