[mkgmap-dev] Memory limits for mkgmap and splitter

Wed Aug 5 16:01:59 BST 2009

> thanks a lot for new splitter beta release. I tried your version with
> a small region (Bayern in Germany). Max nodes 800.000, 12 tiles:
> 
> old splitter: 310 MB RAM
> new splitter: 240 MB RAM
> old splitter: 370 sec
> new splitter: 470 sec

Hmm, I'm surprised the new version is taking longer actually. I didn't benchmark 
my most recent changes so perhaps I've done something silly. It should be 
the same speed or faster than the old. Thanks for the statistics, I'll take 
a look and see what I can do to get it back up to speed.

> old splitter: problem with 31 relations in more than 4 tiles
> new splitter: no problem

That's in line with what I'd expect given my latest change.

> old splitter: problem with 2 ways in more than 4 tiles
> new splitter: problem with 2 ways in more than 4 tiles

Again, this is in line with what I'd expect, I haven't done anything to solve 
this so far. Fixing ways that span more than 4 tiles is tricky unfortunately 
without hurting both memory usage and performance. I don't think I'll be 
able to address this limitation in the short term but I'm certainly aware 
it's a problem and have some ideas on how to tackle it down the line.

Thanks for the feedback, much appreciated.

Chris