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[mkgmap-dev] Performance hints for Java JRE 9 + 10

From Gerd Petermann gpetermann_muenchen at hotmail.com on Wed May 16 15:09:19 BST 2018

Hi Felix,

I am not sure but I think a JRE 8 will not execute a jar file compiled with JDK 9 or higher.
So, I was only talking about using a newer JRE. I don't know when we will start to compile with 9 or higher.
If I got that right JDK 9 is no longer available, so we probably have to switch to 10 or higher.


Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Felix Hartmann <extremecarver at gmail.com>
Gesendet: Mittwoch, 16. Mai 2018 16:05:50
An: Development list for mkgmap
Betreff: Re: [mkgmap-dev] Performance hints for Java JRE 9 + 10

Hi Gerd,
What about if you compile mkgmap with java 9 or higher - and run it on Java 8 - this also applies or not? Or asked differently - is this dependant on the compilation system or on the executing system?


On 16 May 2018 at 15:53, Gerd Petermann <GPetermann_muenchen at hotmail.com<mailto:GPetermann_muenchen at hotmail.com>> wrote:
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.


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Felix Hartman - Openmtbmap.org & VeloMap.org
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Austria - Österreich

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