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[mkgmap-dev] mkgmap memory problem with big, nearly empty tiles

From Gerd Petermann gpetermann_muenchen at hotmail.com on Sun Jan 22 13:45:03 GMT 2012

Hi Thorsten,

please provide also the commands that you use to run splitter.
I think you may get around the problem if you edit the areas.list created by splitter and use the modified version next time.


> Date: Sun, 22 Jan 2012 12:30:41 +0100
> From: kukuk at suse.de
> To: mkgmap-dev at lists.mkgmap.org.uk
> Subject: [mkgmap-dev] mkgmap memory problem with big, nearly empty tiles
> Hi,
> with my try to build a map for the whole US I run into the next
> problem: some of the US is on the other side of the 180 longitude.
> As result, splitter will create a really huge tile with nearly
> no data. mkgmap with --index --gmapsupp needs a really huge amount
> of memory for this (8 GB) and then prints:
> "There is not enough room in a single garmin map for all the input data
>    The .osm file should be split into smaller pieces first."
> The bbox is really big: 
> <bounds minlat='-0.65' minlon='-38.9' maxlat='71.851' maxlon='180.0'/>
> The data is only in a very small area of that tile. If I adjust the
> bounds area, I can build the tile without problems.
> Beside patching the tile after evey split, is there any way to
> better split the extract with tilesplitter?
> And why does mkgmap need so much memory for this tile? Is there
> any way to improve the mkgmap algorithm to work with this tile?
> I'm using mkgmap-r2169 and the command line is:
> env MKGMAP_MEM=8000M mkgmap --style-file=style --country-name=usa --country-abbr=US --family-name=TK-OSM-US --area-name=US --latin1 --license-file=TK-USA-Basemap_license.txt '--copyright-message=OpenStreetMap.org contributors. See: http://wiki.openstreetmap.org/index.php/Attribution. TK-USA-Basemap based on data from 2012-01-20.' --series-name=TK-USA-Basemap --bounds=bounds --location-autofill=bounds,nearest,is_in --add-pois-to-areas --reduce-point-density-polygon=8 --min-size-polygon=8 --make-opposite-cycleways --remove-short-arcs --adjust-turn-headings --route --net --generate-sea=extend-sea-sectors '--pois-to-areas-placement=entrance=main;entrance=yes;building=entrance;barrier=entrance' --index -c mkgmap.cfg --gmapsupp --input-file=verybigbb.osm  --description=TK-USA-Basemap
> The sources can be found at: http://osm.thkukuk.de/tmp/bbox.tar.gz
>  Thanks,
>    Thorsten
> -- 
> Thorsten Kukuk, Project Manager/Release Manager SLES
> SUSE LINUX Products GmbH, Maxfeldstr. 5, D-90409 Nuernberg
> GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg)
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