Hi all,

it seems that the new Garbage Collector (G1GC) that was introduced with Java 
JRE 9 causes longer run times for splitter and mkgmap.
I've played with some options and found that the use of -XX:+AggressiveHeap 
seems to be a good idea when you use these newer JREs.

Without this option the java programs tend to allocate more memory and thus the 
OS might start to swap.

Gerd

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