[mkgmap-dev] Commit r4182: improve RuleIndex: Reduce number of evaluated rules

Fri Apr 27 07:40:41 BST 2018

Hi all,

attached are two log files created with the default style for a tile in Hamburg. If you compare them with a good file comparer you can see that
the number of evaluated rules are smaller while the number of executed rules don't change (last value in the log)
Typical effect of the change for rules that look for a specific value:
INFO: uk.me.parabola.mkgmap.osmstyle.stats  \hh\63240003.osm.pbf: points stats (rule/evals/true) $amenity=biergarten [0x2d02 level 0]/5596/4
INFO: uk.me.parabola.mkgmap.osmstyle.stats  \hh\63240003.osm.pbf: points stats (rule/evals/true) $amenity=biergarten [0x2d02 level 0]/4/4
Sorry, the numbers are at the end of the lines, so comparison is a bit tricky.

This shows: The old code evaluated all rules with amenity= when for node with the amenity tag.
The effect on run time is not that big, maybe a few percent.

Gerd

________________________________________
Von: mkgmap-dev <mkgmap-dev-bounces at lists.mkgmap.org.uk> im Auftrag von svn commit <svn at mkgmap.org.uk>
Gesendet: Freitag, 27. April 2018 08:20:04
An: mkgmap-svn at lists.mkgmap.org.uk; mkgmap-dev at lists.mkgmap.org.uk
Betreff: [mkgmap-dev] Commit r4182: improve RuleIndex: Reduce number of evaluated rules

Version mkgmap-r4182 was committed by gerd on Fri, 27 Apr 2018

improve RuleIndex: Reduce number of evaluated rules

The old index returned more rules than needed, thus the style evaluation was slowed down a bit. You can use logging to find the actual changes with this setting in logging.properties:
uk.me.parabola.mkgmap.osmstyle.stats.level=INFO

Slightly modified tags3.patch.

http://www.mkgmap.org.uk/websvn/revision.php?repname=mkgmap&rev=4182
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