HI Gerd, thanks for that – I was scratching my head trying to think of a way that would use less memory. If using the tags, each tag would have used more than 8 bytes, although they would have only been on faked elements. The tag iterators would also have processed them (unless special code was included to exclude them). I did wonder whether we could store both the original Id and the fake Id in the 64 bit number with perhaps 40 bits for the OSM Id and 24 bits for the fake Id, but this might not be enough space (taking into account the future).

Mike

From: Gerd Petermann [mailto:gpetermann_muenchen@hotmail.com]
Sent: 19 January 2015 20:29
To: mkgmap-dev@lists.mkgmap.org.uk
Subject: Re: [mkgmap-dev] echo improvements for elements with fake ids

Hi Mike,

I've committed the patch as is. The memory impact is not that big as
we have typically less than 500.000 instances of Element in one tile,
so 8 more bytes * 500.000  ~ 4MB more heap.

Gerd

From: mike@tvage.co.uk
To: mkgmap-dev@lists.mkgmap.org.uk
Date: Mon, 19 Jan 2015 11:55:00 +0000
Subject: [mkgmap-dev] echo improvements for elements with fake ids

The attached patch improves the echo and echotags messages by including the
id of the original element when a fake id is generated by mkgmap, thus
enabling you to find it in OSM.
 
Please try, and commit if you are happy with the change.
 
Regards,
Mike

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