Steve Lime wrote:
Be interested to hear if the soon-to-be released MapServer 5.6 fares any better speedwise. 5.0.2 is pretty darn old. -Steve
Folks, I believe much of the performance problem is that some versions of GDALOpen() do a scan of the whole directory as part of the file opening process. In a directory, like Steven's, with 60000 tiles (120000 files!) that becomes a significant performance problem. I have suggested a configuration item that might disable this depending on his version of GDAL. I also noted that Steven's tiles are 1500x1500 pngs which is a pretty crappy thing to serve web maps from. MapServer and GDAL essentially need to completely decode each PNG touched by a map request. To it's credit I believe GeoServer does some smart caching that helps if there is any locality of requests. I've also briefed Steven on use of shptree to build a spatial index on his spatial index. Anyways, my point is that the performance issues are not necessarily at the MapServer level. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
