[mkgmap-dev] splitter r254

Thu Dec 13 14:58:17 GMT 2012

Felix Hartmann-2 wrote
> I  used max-nodes=2 300 000
> so it ends up with 143 tiles.
> 
> 255 didn't give significant improvements (maybe 20 seconds).

I don't understand what you mean here, 255 is the default. If you have 143 
real tiles, the limit of 255 is probable not reached, means, all phases are
done 
with one read pass.
A higher max-areas value is only needed if more than 255 tiles are
processed.
I found out that the problem-generator-phase doesn't report how many 
areas it processes in one pass, so you have to calculate on your own:
if the number of areas (including the pseudo-areas) is e.g. 1000 and you run
with max-areas=255, splitter will use 4 read passes, each processing 250
areas.

Gerd

Felix Hartmann-2 wrote
> I will probably run splitter now with 1024 max-areas. Hope 8.4GB heap 
> will be enough for it..
> It would probably be good if the splitter assumes +50% or whatever you 
> seem reasonable for max memory on areas for the first pass..
> I will give 2048 max-areas a try too, just to see if I can split Europe 
> in 1 pass. If it works, I'll stick with it. Still need to wait for the 
> 2GB additional Ram for my server though...

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