[mkgmap-dev] memory requirements for generating planet bounds

Thu Feb 14 20:36:20 GMT 2013

There is also another way to generate the bounds.
It is possible to cut the planet into pieces. Create the bounds for the 
pieces and merge the bounds afterwards. This is how I create bounds.

I can create the bounds with cutting the planet into 3 pieces on a 
laptop with 4GB.

You can merge bounds with the following command:
java -cp mkgmap.jar 
uk.me.parabola.mkgmap.reader.osm.boundary.BoundaryMerger <boundsdir1> 
<boundsdir2> <mergeddir>

The command merges the bounds from boundsdir1 and boundsdir2 and put the 
merged bounds to mergedir.

I think it would be easier if the BoundaryPreparer accepts multiple 
input files and does the merging automatically. Put it on the TODO...

WanMil

> Hi Thorsten,
>
> this reminds me on the osmid_v1.patch using fastutil.jar
> It is esp. usefull in this case because the memory requirements are caused
> by
> the huge number of coords.
>
> @Steve: Do you still plan to add it ?
>
> Gerd
>
>
> Thorsten Kukuk wrote
>> Hi,
>>
>> On Thu, Feb 14, Rich wrote:
>>
>>> as per
>>> http://wiki.openstreetmap.org/wiki/Mkgmap/help/options#Using_preprocessed_bounds_for_the_address_index
>>> , i tried to generate bounds myself from a planet boundary extract
>>> (prepared with osmconvert/osmfilter like in the instructions on the same
>>> page).
>>>
>>> java -cp mkgmap.jar
>>> uk.me.parabola.mkgmap.reader.osm.boundary.BoundaryPreprocessor
>>>
>> <inputfile>
>>
>> <boundsdirectory>
>>>
>>> that run out of the heap space of 2300 megs. before i try experimenting
>>> further, how much heap space is required for creating planet bounds from
>>> boundary extract ? :)
>>
>> You need at least 8GB of free RAM. And I would suggest Sun/Oracle Java,
>> not IBM Java or openjdk.
>>
>>    Thorsten
>>
>> --
>> Thorsten Kukuk, Project Manager/Release Manager SLES
>> SUSE LINUX Products GmbH, Maxfeldstr. 5, D-90409 Nuernberg
>> GF: Jeff Hawn, Jennifer Guild, Felix Imendörffer, HRB 16746 (AG Nürnberg)
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>
>
>
>
>
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