[mkgmap-dev] splitter questions

Thu Oct 22 09:59:39 BST 2020

Hi Gerd.
Yes, it is 64-bit, but i don't have a lot of memory.
--keep-complete=false, can it impact routing possibilities (routing may not 
work well) or is it mainly affecting how the map will look?


Regards
Karl

On torsdag 22 oktober 2020 kl. 10:49:23 CEST Gerd Petermann wrote:
> Hi Karl,
> 
> if you are running a 64 Bit OS make sure to install a 64 Bit java runtime.
> This allows to increase the -Xmx option. You probably need > 5G for this.
> With a 32 Bit OS you can only try to disable the keep-complete option.
> 
> Gerd
> 
> ________________________________________
> Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von 7770
> <7770 at foskan.eu> Gesendet: Donnerstag, 22. Oktober 2020 10:45
> An: mkgmap-dev at lists.mkgmap.org.uk
> Betreff: [mkgmap-dev] splitter questions
> 
> Hi.
> 
> I am trying to split data for some 15 countries. First step is to combine
> the country data (with osmconvert) to one large o5m file and then try to
> split the combined file.
> The o5m file is about 14 GB in size.
> 
> When running splitter i give java -Xmx1600m
> options to splitter are: --max-nodes=1500000 --no-trim
> 
> Splitter calculates around 640 areas/tiles to be created.
> If i understand correctly, ways are parsed completely and then starts
> relations.
> 
> After 100 000 relations i get:
> ***** Full GC *****
> and soon thereafter:
> Exception in thread "main" Exception in thread "worker-0"
>  java.lang.OutOfMemoryError: GC overhead limit exceeded... and many more
> lines.
> 
> After this, one thread (out of two) dies but the other seems to hang doing
> nothing... and i have to manually kill it later.
> 
> 
> 
> Now, i can give java a little bit more memory to java, say up to 1800m.
> 
> setting  --max-nodes= larger should use less memory says documentation.
> With a larger max-nodes, will those tiles be faster or slower to display on
> a GPS unit?
> What is a reasonable value, 10 000 000 nodes or 2 000 000?
> 
> 
> Would --max-areas help my situation?
> If i use --max-areas=350 (approx half of total expected tiles), based on
> your experience would it be enough, or shall i better try with a value of
> 220 (~1/3 of the total tiles)?
> 
> Regards
> Karl
> 
> 
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