[mkgmap-dev] Performance

Sun Jun 28 16:27:35 BST 2009

Hi Richard

> I'm currently trying to create a map from a GB planet extract, and  
> performance seems much slower than I remember. I've split the extract  
> into six parts with splitter.jar (I'm using some big route relations so 
> can't split it any further). The first .osm (36Mb) has been chuntering 
> away for an hour and a half and the .img hasn't been produced yet - is 
> this normal?

It takes just under 4 minutes for me to do the GB extract
split into 13 pieces with routing.  So after an hour I'd imagine something
is wrong.

> The style file is reasonably complex and contains numerous 'set'  
> instructions, plus a handful of relation 'apply's. My system is an Intel 
> Mac mini, OS X 10.5, 1Gb.

A number of people run fairly complex styles, but still it could be a bug that is
only shown with your style though.  If you could send me it I will look at
it and see if it is the problem.

The only non-bug thing I can think of is the memory given to java.  If you
give an amount that is just not quite enough, it can slow the run down
dramatically.  That would be pretty unlucky though, normally it would work
or you would run out of memory within a few minutes.

..Steve