Hi, Did some testing, using file: http://planet.openstreet.nl/planet-benelux-090513.osm.gz Split with: java -Xmx2048m -jar splitter.jar --mapid=31303001 --max-nodes=500000 planet-benelux-090513.osm.gz See outputs in the four directories at: http://www.amsk.nl/osmtest/ (slowish host, sorry). .../svn1035: mkgmap vanilla svn rev 1035 .../patchv7*: mkgmap 1035 + mb-parallel-maps-v7.patch + mb-fix-long-segments-v1.patch The mkgmap-invocations are listed in the "cmdline" files in the respective directories. Output and logging are in those directories as well. I've removed the input-files (except in the svn1035 directory; the others use the same input) and the gmapsupp.img-files (too large; let me know if you need them). Note especially the difference between "svn1035" and "patchv7_1thread" (not identical), and between "patchv7_4threads" and "patchv7_4threads.run2" (exact same inputs and commandline, different output). Hope this helps. If you need any other info/testing, let me know. Regards, Martin