[mkgmap-dev] splitter performance with "osm.pbf" compared to "o5m"

Sat Dec 19 08:53:36 GMT 2020

Hi Franco,

first see https://wiki.openstreetmap.org/wiki/Mkgmap/help/splitter#Tuning_for_best_performance.
I think the difference should not be that big when splitter has enough memory, so maybe you should add the -Xmx JRE parameter.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von Franco Bez <franco.bez at web.de>
Gesendet: Samstag, 19. Dezember 2020 09:40
An: mkgmap-dev at lists.mkgmap.org.uk
Betreff: [mkgmap-dev] splitter performance with "osm.pbf" compared to "o5m"

Hi all,

I noticed that splitter has a major performance lag on osm.pbf files
compared to o5m.

splitting off my DACH region in pbf  format takes 15min 45sec, while
splitting the same region in o5m format is finished after 5min 17sec.

So it takes almost 3 times as long splitting pbf data.

mkgmap on the other hand has almost no difference at all when building
the DACH map from the pbf-tiles, compared to o5m-tiles.

mkgmap with pbf takes 12min 28sec, with o5m 12min 09sec.

here are my command lines:

java -ea  -XX:+AggressiveHeap  -jar splitter-r597/splitter.jar  >
splitter.log  --geonames-file=cities15000.zip --mapid=65000001
--output=pbf  --precomp-sea=sea-latest.zip --write-kml=dach.kml
--keep-complete  --overlap=0  --max-nodes=1200000 dach.osm.pbf

java -ea  -XX:+AggressiveHeap  -jar splitter-r597/splitter.jar  >
splitter.log  --geonames-file=cities15000.zip --mapid=65000001
--output=o5m  --precomp-sea=sea-latest.zip --write-kml=dach.kml
--keep-complete  --overlap=0  --max-nodes=1200000 dach.o5m

Any ideas why pbf splitting is so slow compared to o5m splitting ?

Ciao,

  Franco