On Fri, Oct 27, 2017 at 4:14 PM, Even Rouault <even.roua...@spatialys.com> wrote:
> 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. > > > Ah, thanks Even! I should have read the docs more carefully! > 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 ) > > > Nice, this will be helpful! Thanks again, Pete
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