Alessandro, Thanks for answering, yes I have fcgid enabled and I meant configuration stuff especially getprojectsetting request which is taking very long on certain project. So that is cached, in memory I assume?
Are there any settings, I would to keep the cache unless I saved the project or restart server, which are obvious cases to remove cache. From the code example I see that if the project is changed it is removed from cache, I don't see any other cases. Can I use apache cache modules to save the cache to disk? How are anyone dealing with this on production servers? regards, Uros 2014-08-26 19:33 GMT+02:00 Alessandro Pasotti <[email protected]>: 2014-08-26 19:05 GMT+02:00 Uros Preloznik <[email protected]>: > > Hi, > > > > I would like to have more information regarding Qgis server caching > certain > > requests and how to control that. I didn't find any documentation > regarding > > this, so I ask. > > > > Example: > > On my environment (ubuntu 12.04, apache 2.2.22, qgis 2.4) I do > > GetProjectSettings request on certain project. If I restart Apache or > save > > the project the request is not cached (I assume) and it takes from 20 - > 65 > > seconds. In order to avoid Server Error after 40second I added this line > to > > Apache configuration > > > > FcgidIOTimeout 80 > > > > So, after this long request, next same request is immediately so it must > be > > cached, right? I tested with different clients and must be on server. > But I > > do not control this, because after unknown amount of time the cache is > > removed. > > > > Can anyone explain this and should I explore basic Apache caching > tehniques > > like this: > > http://httpd.apache.org/docs/2.2/caching.html > > > > Right now I don't have any caching modules enabled in Apache. > > > > Another question is why is it taking so long, but I will ask that extra. > > > > thanks > > > > Uros > > > > Hi Uros, > > I might be wrong but I think that request are not cached in the > standard sense, the startup delay is due to the application startup > time ant to the first time parsing of the project file that also needs > to instanciate many objects. > > What is cached are project configurations (parsed project files) for > the available services, layers, getcapabilities and getprojectsettings > requests, but the caches are invalidate whenever the project file > changes on disk, for instance see: > > > https://github.com/elpaso/QGIS/blob/master/src/mapserver/qgsconfigcache.cpp#L36 > > The end of the story is that there at the first request there is the > application startup time + the configuration parsing for the > particular service and project tuple, the next requests for the same > service and project is considerably faster because it doesn't have to > start the application nor to parse the project file and instanciate > all the stuff. > > Of course, all this goodies come only with FCGI, if you run the server > in CGI mode, then all requests are treated as the first one. > > -- > Alessandro Pasotti > w3: www.itopen.it >
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