[mkgmap-dev] Memory limits for mkgmap and splitter

Wed Aug 5 16:12:41 BST 2009

My latest changes were just quick fixes to get relations and 256+ tiles working, 
there's still more that needs to be done before this is really useful. In 
particular, I need to prevent the splitter from hanging on to node and way 
information that it doesn't need for a given set of 255 areas. In other words, 
currently the memory requirements will still be very large and you don't 
stand much chance of splitting the planet file. I'll do some further work 
to try and reduce this, I think there's a couple of easy wins.

You might be able to split America though, if you do attempt it please let 
me know how it goes.

> Thanks for your work on this, much appreciated!
> 
> I'm trying to get a grip on how to use this version of splitter and
> re-read your mail a few times. I hope I understand it:
> 
> So this version should eliminate the need to split the planet with
> Osmosis before giving it to splitter. Just provide the planet and
> splitter will define around 500 tiles and reprocess the planet a few
> times to get all the tiles extracted.
> 
> I'll start a test run with the latest planet tonight. If it doesn't
> work on my 4GB machine then I'll try the America's extract made with
> Osmosis and report back.