Peter, > I'm using MapServer-7.0.6 built with GDAL-2.2.2. Is VSI_CACHE_SIZE the > cache size per process? per file handle?
Per-file handle : """ The default size of caching for each file is 25 MB, and can be controlled with the VSI_CACHE_SIZE configuration option (value in bytes). Content in that cache is discarded when the file handle is closed. """ ( http://gdal.org/gdal_virtual_file_systems.html#gdal_virtual_file_systems_vsicache ) So with CLOSE_CONNECTION=DEFER, what you observed is logical. CLOSE_CONNECTION=DEFER could probably be improved with a least recently used cache to maintain the maximum number of simultaneously opened datasets to a reasonable amount. Alternatively with GDAL trunk, for /vsicurl/ and related file systems, you can also tune a global cache """ In addition, a global least-recently-used cache of 16 MB shared among all downloaded content is enabled by default, and content in it may be reused after a file handle has been closed and reopen. Starting with GDAL 2.3, the size of this global LRU cache can be modified by setting the configuration option CPL_VSIL_CURL_CACHE_SIZE (in bytes). """ ( http://gdal.org/gdal_virtual_file_systems.html#gdal_virtual_file_systems_vsicurl ) Even -- Spatialys - Geospatial professional services http://www.spatialys.com
_______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
