[mkgmap-dev] Performance of mkgmap.jar and splitter.jar

Sat Apr 4 12:14:36 BST 2009

Yes, unzipping with 7-zip takes 57 seconds for austria.osm.bz2

Johann Gail wrote:
>
>>
>> 1. Performance Tile Splitter.
>> Split austria.osm with already established areas.list (4 areas) takes 
>> 120sec, the same but austria.osm.bz2 took astonishing 312 seconds. 
>> The tile splitter works significantly faster on unzipped sources.
>>
> I haven't stopped by stopwatch, but on my system by feeling it is 
> roughly the same time at b2zipped and unzipped files. I don't know any 
> significant slowdown on my system. But it is fact, that the bzip2 
> algorithm needs a lot of cpu resources, you can't change it. Do you 
> save time, if you unzip the bz2 data before running splitter and add 
> that needed time to the splitter running time?
>
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