Hi Jens,
Sorry, you are absolutely right, actually the default bounds for the layer are
printed below "Here are the max bounds, if you do not specify bounds these will
be used" on the seeding form. We use a custom grid with the same bounds as the
bounds of our layers which lead me on a wrong track.
-Jukka-
Nachtigall, Jens wrote:
Hi,
I've installed Marlin renderer now (only basic use as described at
https://github.com/bourgesl/marlin-renderer/wiki/How-to-use#how-to-use-basic),
still with Oracle Java 7. I also set the number of tasks to 16. I'll see if
this speeds things up.
@Jukka: Regarding the BBOX. I left the "Bounding box" field (subtext "These are
optional, approximate values are fine.") empty. I do not think that the bbox
needs to be set here. The layer (based on the shapefile) already has a bounding
box, so I would assume that GeoServer/GeoWebCache is intelligent enough to not
try to render the whole world for a layer with restricted bounds. Correct me,
if I am wrong.
Best,
Jens
Von: Rahkonen Jukka (MML) [mailto:jukka.rahko...@maanmittauslaitos.fi]
Gesendet: Donnerstag, 26. März 2015 11:14
An: Nachtigall, Jens (init);
geoserver-users@lists.sourceforge.net<mailto:geoserver-users@lists.sourceforge.net>
Betreff: Re: Speeding up GeoWebCache seeding process
Hi,
One question: Do you seed the whole world or only BBOX of Germany? Resolution
of level 17 is 1.1943 m and Germany is not a big country which makes me feel
that 21 days is rather a long time. I have seeded the area of Finland to 0.5 m
resolution from aerial images into 2 TB of tiles in about the same time which
makes me feel that one week should be enough for you. However, I was seeding
from an external WMS and you most probably have different hardware so our
situations are not comparable.
I would absolutely divide the job into a bunch of smaller BBOXes. I have a
feeling that the Seed missing tiles option is not always reliable but it can
wrongly think that there is nothing more to seed. However, if you have been
seeding for two weeks and all processes die it is not really reasonable to use
the Reseed option. If a small job interrupts it does not pay so much to start
it again.
Follow also the CPU load. Adding more seeding processed after the load is
already close to 100% makes the overall speed just slower.
-Jukka Rahkonen-
Nachtigall, Jens wrote:
Hi,
I have a 100MB shapefile with LINESTRINGs covering Germany, which I added as a
cached layer. I use GeoServer 2.6.2 with included GeoWebCache 1.6.1 to seed
tiles for layers 0-17 for the predefined EPSG_900913 gridset. On a server with
8 cores this process takes about 21 days.
I use Oracle Java 7 and JAI is installed. I've set "Number of tasks to use" to
8 (number of cpu cores).
Is there anything I can do to speed up the seeding process?
Best regards,
Jens
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