Hi Vincent, Jean-Christophe, Guilhem and Sébastien, [ This message is CC'ed to the development mailing list of MapOSMatic, which is why I'm writing to you in english. Please keep the list in the CC list even if you're not subscribed. I'll moderate your messages manually. Thanks! ]
I'm writing to you concerning a PostgreSQL/PostGIS request optimization problem we have in MapOSMatic (http://www.maposmatic.org). The request in question is the one that gives us the list of the streets and the squares they intersect for a given city. Currently, for a city like Toulouse, the request takes 4 minutes and 39 seconds, but our experiment show that it could be optimized down to 3.2 seconds. But we don't know exactly how to generalize our experiments of optimization. Inside of writing a long e-mail, I've written a detailed explanation of the request, the problem and the analysis we've done so far at http://wiki.maposmatic.org/doku.php?id=dev:request_optimization. If you have the time, could you have a look and tell us what we are doing wrong ? Solving this problem would probably allow us to limit the load on the server and to generate maps for larger cities. Of course, if you need details about the request or the environment, don't hesitate. Thanks a lot for your help, Thomas -- Thomas Petazzoni http://thomas.enix.org Promouvoir et défendre le Logiciel Libre http://www.april.org Logiciels Libres à Toulouse http://www.toulibre.org
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