Hi Bernhard, what are your rules for the contour lines? Gerd ________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Bernhard Hiller <bhil@gmx.de> Gesendet: Freitag, 2. November 2018 19:18 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: Re: [mkgmap-dev] splitter: option for maximum tile area? Hi all, still struggling with that strange issue. But I guess I found some hint to the cause: inconsistent file sizes. - extracted OSM data: 400 MB pbf - elevation contour lines: 600 MB pbf - merged file: 1 GB pbf So far, sizes are consistent. When I run splitter on the OSM data only file, it produces many tiles summing up to some 400 MB. Consistent, too. When I run mkgmap on this output, I get a map within about half an hour, and it looks OK (tested with QLandkarte). When I run splitter on the merged file, the tiles sum up to some 9 GB. That is 9 times the size I'd expect. mkgmap can render several of those tiles (but very slowly); and then crashes on one of them with an OutOfMemory exception. So I think that the problem is somewhere in those contour lines, either when merged or alone. I'll try to create a contour lines only map as the next step to test this hypothesis. Kind regards, Bernhard Am 01.11.2018 um 09:32 schrieb Gerd Petermann:
Hi Bernhard,
I tried to reproduce the memory problems with tile 47120005. I don't think that the sea itself is a problem here, at least not when you use the --precomp-sea option. It took only 15 secs to process that tile with asia data from August with the default style and typical options for routing etc. My input file didn't contain SRTM data so I assume this is the reason. Maybe you have many contour lines with ele=in your data?
Gerd
________________________________________ Von: Gerd Petermann <gpetermann_muenchen@hotmail.com> Gesendet: Mittwoch, 31. Oktober 2018 22:49 An: Gerd Petermann; Development list for mkgmap Betreff: AW: [mkgmap-dev] splitter: option for maximum tile area?
Hi Bernhard,
looked again at the splitter command in your last post. You also use a rather high max-nodes value. Such a high value means that you get rather large tiles and that mkgmap needs more memory for each tile compared to the default 1400000. Many users use a value near 1200000.
Gerd
________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Gerd Petermann <gpetermann_muenchen@hotmail.com> Gesendet: Mittwoch, 31. Oktober 2018 22:20 An: Development list for mkgmap Betreff: Re: [mkgmap-dev] splitter: option for maximum tile area?
Hi Bernhard, there is no option for this. Do you use option --precomp-sea in splitter? Maybe you use --no-trim ? If that doesn't help you can try to change the values for private static final int MAX_LAT_DEGREES =5; private static final int MAX_LON_DEGREES =0; in SplittableDensityArea.java and compile your own version of splitter.
Gerd
________________________________________ Von: mkgmap-dev <mkgmap-dev-bounces@lists.mkgmap.org.uk> im Auftrag von Bernhard Hiller <bhil@gmx.de> Gesendet: Mittwoch, 31. Oktober 2018 22:03 An: mkgmap-dev@lists.mkgmap.org.uk Betreff: [mkgmap-dev] splitter: option for maximum tile area?
Hi all, currently a Java OutOfMemory exception prevents me from creating a map. I already use option --max-jobs=(the machine has 4 physical cores) and -Xmx5G (of 8 GB installed). Beyond OSM data, the map contains DEM and elevation contour lines. From the tiles finished and those with a new timestamp but about 0 bytes length, I can see that mkgmap was rendering tiles 47120005, 47120006, 47120007 at the time of crash. Tile 47120005 is extremely large by physical area - some 6° x 5.5° (see attached file), covering a lot of the south chinese sea, i.e. there are not many actual data in that area. I guess that the problem arises with that tile. I remember some case in the past where a single tile covering such a large area of mainly sea caused mkgmap to take an enormous amount of time for rendering - also here, mkgmap already spent about 1 hour before crashing. So I'd like to ask: is there some possibility for limiting the area of a tile among the splitter options? Kind regards, Bernhard _______________________________________________ mkgmap-dev mailing list mkgmap-dev@lists.mkgmap.org.uk http://www.mkgmap.org.uk/mailman/listinfo/mkgmap-dev
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