[Tile-serving] [osm2pgsql] Huge performance loss when using --extra-atributes (#189)

[Benjamin Börngen-Schmidt]

Okay I done further testing and narrowed down the performance impact to the processOsmDataDenseNodes function

Disableing the if statement at https://github.com/openstreetmap/osm2pgsql/blob/master/parse-pbf.c#L321 bumps up the import of nodes to around 650k/s

The Performance impact seems to start at https://github.com/openstreetmap/osm2pgsql/blob/master/parse-pbf.c#L318 where it starts to drop down to ~900k/s

As far as I could dig down the problem was, that it has something to do with the addItem function in https://github.com/openstreetmap/osm2pgsql/blob/master/keyvals.c#L223, because disableing all calls to addIntItem and addItem in the processOsmDataDenseNodes boosted the importspeed to around 2900k/s again.

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Reply to this email directly or view it on GitHub:
https://github.com/openstreetmap/osm2pgsql/issues/189#issuecomment-58274096
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