Hi,
having no data, I've downloaded a shapefile of germany roads from
http://www.mapcruzin.com/free-germany-arcgis-maps-shapefiles.htm,
300MB worth of shp file, and applied the default line style... and realized
I did something that makes no sense, the output map looks like
this:
Well, of course it takes a lot of time to paint this map, it's painting 2.7
million roads in a small space.
Moreover, GWC starts seeding from the top, from the slowest tiles, so the
estimate is larger that
reality (mostly because of this style that is way more expensive to draw
when zoomed out than
when zoomed in, in normal maps like OSM the cost is not same, but similar,
because not all
data is painted when zoomed out).
That said, during the time it took me to write this mail I let GWC run and
seed the cache with 4 threads
on a old core i7 820, on Linux, OpenJDK 7, from level 0 to 15, after 10
minutes it reached zoom level 14 and the
tasks report:
Not too bad I'd say? If this is multiply by 4 to get to level 16 and 17,
it would take
4 hours to do zoom level 16, and 16 hours to do zoom level 17... so if I
had done this against
zoom level 0 to 17 it would have taken less than 24 hours, with a larger
shapefile, and
with a silly style.
Cheers
Andrea
On Tue, Mar 31, 2015 at 3:38 PM, Rahkonen Jukka (MML) <
jukka.rahko...@maanmittauslaitos.fi> wrote:
> Hi,
>
>
>
> Can you share the data and CSS?
>
>
>
> -Jukka Rahkonen-
>
>
>
> Nachtigall, Jens wrote:
>
>
>
> Hi again,
>
>
>
> I really do not understand why it takes weeks for a simple 100 MB
> Shapefile with just LineStrings in Germany to render. 99.99 % of all tiles
> are just empty/transparent PNGs anyways, rest is just some red lines… I
> googled and found
> http://gis.stackexchange.com/questions/20712/geoserver-wms-tile-rendering-is-too-slow
>
>
>
> 1. Would it make a difference to add a spatial index to the Shapefile? (I
> did not check if it has one, I would assume that GeoServer just adds one if
> necessary – how can I check if this has been done?)
>
>
>
> 2. Also, we use the GeoServer-CSS extension. But the style is as simple as
> this:
>
> * {
>
> fill: #e31a1c;
>
> fill-opacity: 0.27;
>
> stroke: #e31a1c;
>
> stroke-width: 1;
>
> stroke-opacity: 1;
>
> }
>
> Anyway, can this be related to the long seeding times?
>
>
>
> 3. Maybe some kind of metatiling can be used to speed things up?
>
>
>
> For OSM rendering with mapnik for same extent and much more features, it
> took just a few days. So I really do not get it, why it takes weeks for a
> damn simply Shapefile.
>
>
>
> Ideas welcome…
>
>
>
> Jens
>
>
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