I am having difficulty determining why I'm seeing significant differences in performance between two database configurations with the same data.
One one machine (centos) I have the following software: geos 3.5.0 sfcgal 1.3.1 cgal 4.7.1 postgis 2.2 postgresql 9.4 On a second machine (debian 10) I have the following: geos 3.7.1 sfcgal 1.3.6 cgal 4.13 postgis 2.5.2 postgresql 9.6 In terms of hardware there is no significant difference, if anything the second machine is more capable, but that is not reflected in my performance results. On the first machine when I run a ST_ConcaveHull with about 6000 features, I get result a second or two. On the second machine, it won't finish within 30 minutes. Both are using geos as the postgis.backend. I don't understand why the one is so much faster than the other with the identical data and query. Any suggestions as to what to what the cause may be or how I might diagnose the cause? Any clues would be greatly appreciated. TSW
_______________________________________________ postgis-users mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/postgis-users
