Hi, I have a W10, 64 bit machine  and 10 GB RAM. Since  a few months i can not generate the mdr-file for Europa from www.Download.Geofabrik.de In a first run i generate only all the maptiles. No Problem. in a second i will generate the overview, tdb and mdr. I start java -Xmx9800m -XX:-UseGCOverheadLimit jar mkgmap.jar code-page=1252 -family-id=1901 -x-split-name-index -index  D:\Karten\Europa\*.img.

and get the error. 

with mkgmap-r3864 it get the same error.

How many RAM must i have for Europa complete ?. In august 2016 it was possible to create the mdr with 6 GB RAM. But the filesize is growm ...

thomas