From jjbross@gmail.com on March 25, 2012 03:12:38

Two quick answers:

1. be patient, mapsforge-map-writer-0.3.0 may take quite a while for specific regions
   or
2. update to mapsforge-map-writer-0.3.1-SNAPSHOT, it uses caching and thread pooling

Longer answer:

Since version 0.3.0, we switched back to the Java Topology Suite (JTS) library for all computational geometry tasks. Before that, we had our own, specialized and faster implementations which served most purposes. JTS allows us to accomplish more complex operations at the expense of some performance. But it is not only JTS alone, it is rather the mere fact that we now process more complex polygons which we discarded before.

Some regions have a lot of large, complex polygons (e.g. Sweden, Finland, Russia, Romania, Belarus) and in the current implementation of the writer these large polygons have to be created and processed many times. In version 0.3.1-SNAPSHOT we have added a cache for JTS geometries to relieve that situation. For the earlier mentioned regions cache hit rates of 35% to 50% are observed. We also added a thread pool so that expensive JTS operations can be processed in parallel. Currently the parameter thread-pool-size is not available, the thread pool size corresponds to the number of available processors.

I tested 0.3.1-SNAPSHOT with the supplied arkhangel_sk.osm.pbf and it took less than 10 minutes on a quad core machine (type=ram).

Please let us know if that also worked for you or if you experience any other problems with the updated writer.

Status: Accepted

From menion.asamm on March 25, 2012 03:19:18

Hello,
I'm patient don't worry. This wasn't unpatient report. I'll be very glad to help as much as possible.

You pointed on exactly regions I had to remove from generating process. Belarus took 12 hours, Finland, Sweden etc ... I'll try to update to SNAPSHOT version and will report back soon. Thank you!!

From menion.asamm on March 27, 2012 03:14:11

I'm back .. have to say that very good solution. Some maps still take quite a lot of time, mainly Honshu island of Japan anyway around 14 hours isn't big problem for me, because I'm generating new maps once a month. But just to let you know ...

So thank you very much. Generating is slower, anyway also countries that I wasn't able to generate before, are now completed, so perfect! This is more important

As I wrote before, if you'll want to test generating on some maps, let me know. I can measure some times with different versions or ... whatever ;)

From thilo.mu...@gmail.com on April 01, 2012 04:28:58

I am closing this issue now as it seems to be solved by the improvements in the latest version of the map-writer.

Status: Fixed
Labels: -Type-Defect Type-Enhancement