Paul, Are you using metatiling? That would substantially reduce the number of requests mapcache does to mapserver.
You also have the <mapcache> ... <threaded_fetching>true</threaded_fetching> </mapcache> option, that lets mapcache launch mapserver requests in parallel instead of sequentially (YMMV, this option isn't very tested) -- thomas On 28 October 2015 at 16:20, Paul Madden <pmad...@nsidc.org> wrote: > I am working with a web application that makes WMS queries to MapCache. The > application supports zoom levels 0 through 13, and I have used mapcache_seed > to seed the cache through level 10. The deeper levels take so long to seed > that I am considering stopping at level 10 and letting MapCache / MapServer > produce deeper levels on demand, as users visit them. The problem I'm facing > is that, as far as I can tell, MapCache requests tiles from MapServer > serially, then stitches together the required image from these tiles, when it > receives a request for an uncached level. In one test, 34 separate tiles were > requested from MapServer, one at a time, and it took ~30 seconds to render > the final image. > > I'm wondering whether there is a way to configure MapCache to cache/provide a > defined set of zoom levels, and to proxy requests at other zoom levels > directly to MapServer. I tried setting minzoom and maxzoom on my <grid> in > mapcache.xml to "0 10". I tried adding a proxy for my cached layer, hoping > that MapCache would redirect requests for unsupported zoom levels to > MapServer (I have proxies in place for other, completely uncached layers, and > those work fine). I tried copying/renaming the GoogleMapsCompatible grid > definition into my mapcache.xml and removing from <resolutions> zoom levels I > don't want MapCache to cache. So far, these attempts apparently just prevent > MapCache from serving the deeper layers at all. > > Any thoughts on how I might address this issue? It might also help if > MapCache would make concurrent requests for tiles at uncached levels, but I > have no idea if this is feasible. And it would be nice to be able to let > MapServer handle some zoom levels directly in any case. > > Thanks in advance for any ideas. > > Paul Madden > National Snow and Ice Data Center > _______________________________________________ > mapserver-users mailing list > mapserver-users@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/mapserver-users _______________________________________________ mapserver-users mailing list mapserver-users@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/mapserver-users
