[Qgis-user] Qgis-server recompute always the layer bbox ?

[G. Allegri]

>
>
> I don't understand why the qgis-server eed to calculate always the bbox.
> In the server project windows,
> qgis ask for the published bbox.
> Why it don't use it as bbox rather than calculate it on every request ?
>

Marco, correct me if I'm wrong.
QGIS Server doesn't calculate the BBOX, it parses the layers extents from
the .qgs project and then combine them to obtain the entire BBOX.
The only operation it does is reprojecting the extents to WGS84 to create
the EX_GeographicBoundingBox element.

Anyway, in case the project advertises and extent, the combined extent
won't be calculated, so in your case this phase shouldn't be the
bottleneck...

giovanni





>
> The FastCGI don't help really.
> In a publishing environment every few hour the instances are restated to
> removed zombi process.
> This mean that every few hours the FastCGI are emptied and reloaded.
> A fastcgi environment mean to load 20 instances of QGIS-server and every
> of them do them own elaboration .
> As the bbox calculation for every layer.
>
> GASP.
> The start could ask about one hours and more.
>
> Also another problem with the fastcig is that when
> I change something on a project I need to restart to Web instances to
> dismiss the actual project and reload the new.
>
> So every change in a qgis project need a restart of all proccess (20 and
> so on in a fastcgi enviroment) every with a slow bbox calculation phase.
>
> mmhh...
>
> :/
>
>
>
> 2014-02-14 9:13 GMT+01:00 G. Allegri <giohappy at gmail.com>:
>
>>
>>
>>
>> 2014-02-14 Marco Hugentobler <marco.hugentobler at sourcepole.ch>:
>>
>>  Hi Andrea
>>>
>>>
>>> >I suspect that QS try always to recalc the box of every layer.
>>>
>>> QGIS server caches layers (up to 100, but that can be enhanced using the
>>> environment variable MAX_CACHE_LAYERS).  Furthermore, the GetCapabilities
>>> documents are cached (so no recalculation if using FastCGI).
>>>
>>>
>> Thanks Marco, you confirmed what I told Andrea.
>> It would be a good enhancement if caching could be done in a persitent
>> manner (out of memory). We could consider, in the future, to use memcache
>> or something similar.
>>
>> giovanni
>>
>> _______________________________________________
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>> Qgis-user at lists.osgeo.org
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>>
>
>
>
> --
> -----------------
> Andrea Peri
> . . . . . . . . .
> qwerty àèìòù
> -----------------
>



-- 
Giovanni Allegri
http://about.me/giovanniallegri
Twitter: https://twitter.com/_giohappy_
blog: http://blog.spaziogis.it
GEO+ geomatica in Italia http://bit.ly/GEOplus
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