[mkgmap-dev] possible bug? mkgmap freezes with lines only routing style

Mon Oct 31 10:59:21 GMT 2011

Yes that is probably best.

I set names pretty extensively, and even I would only need about 80 
additional lines of code in my lines style with mkgmap:noindex=true (as 
I have to duplicate all lines where names are set to have one with 
name!=* set mkgmap:nopreviousname=yes and then check that condition on 
any future setting of names, the other option of doing a (highway=* & 
name!=* & ref!=* & route_name!=*) set mkgmap:nopreviousname=yes wouldn't 
mean less lines of new code).

On 31.10.2011 11:40, WanMil wrote:
> I think it's a good idea to use a flag like 'mkgmap:noindex=true' which
> can be set in the style file. That provides the best flexibility.
>
> WanMil
>
>> Hi
>>
>> I would like some opinions please from those that make maps.
>>
>> If you have a style that say sets the name of every path to 'Path'
>>
>>      eg: highway=path | highway=footway | highway=track {name 'Path' }
>>
>> or anything similar that results in thousands of roads with the same
>> name, then mkgmap appears to freeze.
>>
>> The code that is slow is creating a list of roads that will be used
>> when you search for an address in MapSource or on the device.
>>
>> I can fix this in various ways, but I want to ask how useful it is to
>> have thousands of roads with the same name appear as a result of a
>> search?
>>
>> For a start in mapsource, you only see a few of the results anyway.
>>
>> Should I drop the name completely from the index when there are more
>> than say 500 roads with the same name in the same city?
>>
>> There is a branch called simplify-sorted-roads where I am trying out
>> different approaches to the problem, if anyone else wants to try it out
>> or look at it.
>>
>>
>>> I can confirm that behaviour. Although in real mkgmap does not freeze
>>> (endless loop) but is working very very hard. Possibly the mkgmap code
>>> is not very optimal for the special test case.
>>>
>>> @Steve, the code requires a very long time in the
>>> NETFile.simplifySortedRoads method because I think there are many roads
>>> with the same name. I think I remember a similar discussion some time
>>> ago? The method seems to perform a brute force method to detect
>>> connected roads with the same name. Can you have a look on it?
>> ..Steve
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