It works fine and produces a map of germany with some surrounding areas, but it needs about 140 GByte of free harddisc space. The main reason is, that the unpacked file europe.osm has almost 100 GByte in size.
Is there a trick to reduce the necessary disc space, e. g. by letting osmosis access the europe.osm.bz2 file directly?
You could use the PBF format extracts from Geofabrik, they use less disc space than the bz2 files.
Osmosis can read or write in PBF format, and splitter/mkgmap can read from them.
This needed only a few GBytes of drive space. A drawback is, that it took much more time (about 17 hours on my computer compared to an approximate “overnight job” before). Can I somehow use the second core of the CPU also for Osmosis? The resulting gmapsupp.img seemed to be ok, as a first test with my garmin indicated.
What I don’t understand is: Both gmapsupp.img-files have the same length, but are not equal on a binary level.