[Geoserver-users] wms tile caching

GeoServer GeoServer User
1

Hi all,

have read lots of post regarding the wms tile caching. can i know
how it can be done in geoserver? as i need to improve the performance of
the map tile generation.

thank you

Regards,
Kencana
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2

Kencana ha scritto:

Hi all,

have read lots of post regarding the wms tile caching. can i know
how it can be done in geoserver? as i need to improve the performance of the map tile generation.

Well, you can do two things.
First one is to enable the Geoserver meta tiler: tiles will still be generated on the fly, but somewhat quicker because a 3x3 meta-tile
is rendered in memory, then split, and the extra 8 tiles you did not
request are cached for a few seconds so that they can be returned
right away to the client. Besides that, it improves labelling too.
Our map preview uses it, I suggest you download a 1.5.x nightly
and try it out (http://geo.openplans.org/nightly/1.5.x/), more
informations about the on the fly meta tiler here:
http://docs.codehaus.org/display/GEOSDEV/On+the+fly+meta+tiling

A faster alternative if your map is static is to use tilecache,
and we have a tutorial here:
http://docs.codehaus.org/display/GEOSDOC/TileCache+Tutorial

Unfortunately for some unknown reasons the two pages above
require that you are authenticated to be seen, so either
wait for us to sort out what's going on, or register against
docs.codehaus.org as a user.

Hope this helps
Cheers
Andrea

3

Hi,

thanks for the information. is it possible to use tilecache with google map?
how can i call the function to get the map image from google api?

Thank you

Kencana

aaime wrote:

Kencana ha scritto:

Hi all,

have read lots of post regarding the wms tile caching. can i know
how it can be done in geoserver? as i need to improve the performance of
the map tile generation.

Well, you can do two things.
First one is to enable the Geoserver meta tiler: tiles will still be
generated on the fly, but somewhat quicker because a 3x3 meta-tile
is rendered in memory, then split, and the extra 8 tiles you did not
request are cached for a few seconds so that they can be returned
right away to the client. Besides that, it improves labelling too.
Our map preview uses it, I suggest you download a 1.5.x nightly
and try it out (http://geo.openplans.org/nightly/1.5.x/), more
informations about the on the fly meta tiler here:
http://docs.codehaus.org/display/GEOSDEV/On+the+fly+meta+tiling

A faster alternative if your map is static is to use tilecache,
and we have a tutorial here:
http://docs.codehaus.org/display/GEOSDOC/TileCache+Tutorial

Unfortunately for some unknown reasons the two pages above
require that you are authenticated to be seen, so either
wait for us to sort out what's going on, or register against
docs.codehaus.org as a user.

Hope this helps
Cheers
Andrea

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4

Kencana ha scritto:

Hi,

thanks for the information. is it possible to use tilecache with google map?
how can i call the function to get the map image from google api?

I think you can, but I've never tried.
I guess this may help:
http://openlayers.org/pipermail/tilecache/2007-July/000303.html

Cheers
Andrea

5

Hi,

I have copy the tilecache folder by following the instruction.
however when i try to run the following url
http://localhost:1209/tilecache-1.8.1/
it returns me a map browser but instead of showing the map image it only
show me
2 boxes with pink background colour. does this means that the tilecache has
installed successfully?
how can i retrieve wms image from geoserver? what url should i use.
i try to access the following url
"http://localhost:1209/wms-c/tilecache.py?LAYERS=sigma&FORMAT=image/png&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG:4326&BBOX=103.7109375,1.2303741774326144,103.88671875,1.4061088354351594&WIDTH=256&HEIGHT=256"

but it returns me :
HTTP ERROR: 404
NOT_FOUND
RequestURI=/wms-c/tilecache.py

Powered by jetty://

any idea of this?i am getting confused.hope you can help me out

Thank you

Regards,
Kencana

aaime wrote:

Kencana ha scritto:

Hi,

thanks for the information. is it possible to use tilecache with google
map?
how can i call the function to get the map image from google api?

I think you can, but I've never tried.
I guess this may help:
http://openlayers.org/pipermail/tilecache/2007-July/000303.html

Cheers
Andrea

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6

Kencana ha scritto:

Hi,

I have copy the tilecache folder by following the instruction.
however when i try to run the following url
http://localhost:1209/tilecache-1.8.1/
it returns me a map browser but instead of showing the map image it only
show me 2 boxes with pink background colour. does this means that the tilecache has
installed successfully?
how can i retrieve wms image from geoserver? what url should i use.
i try to access the following url
"http://localhost:1209/wms-c/tilecache.py?LAYERS=sigma&FORMAT=image/png&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG:4326&BBOX=103.7109375,1.2303741774326144,103.88671875,1.4061088354351594&WIDTH=256&HEIGHT=256"

but it returns me :
HTTP ERROR: 404
NOT_FOUND
RequestURI=/wms-c/tilecache.py

Powered by jetty://

any idea of this?i am getting confused.hope you can help me out

Unfortunately I wasn't the one who wrote the tilecache tutorial and
I never tried to follow it. You can wait for Chris to show up (should
be online in some 5-6 hours) or ask on the tilecache mailing list.

Cheers
Andrea

7

Hi,

Thanks for the quick response. i guess while finding out the solution, i
should try
the first option. which is "enable the Geoserver meta tiler".
can i know how to enable this feature? i mean from what i read (the url gave
me)
i can't find out on how to make use of this feature. i am sorry hope you
don't mind
but can you explain on how to use the geoserver meta tiler feature?

Thank you

Regards,
Kencana

aaime wrote:

Kencana ha scritto:

Hi,

I have copy the tilecache folder by following the instruction.
however when i try to run the following url
http://localhost:1209/tilecache-1.8.1/
it returns me a map browser but instead of showing the map image it only
show me
2 boxes with pink background colour. does this means that the tilecache
has
installed successfully?
how can i retrieve wms image from geoserver? what url should i use.
i try to access the following url
"http://localhost:1209/wms-c/tilecache.py?LAYERS=sigma&FORMAT=image/png&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG:4326&BBOX=103.7109375,1.2303741774326144,103.88671875,1.4061088354351594&WIDTH=256&HEIGHT=256"

but it returns me :
HTTP ERROR: 404
NOT_FOUND
RequestURI=/wms-c/tilecache.py

Powered by jetty://

any idea of this?i am getting confused.hope you can help me out

Unfortunately I wasn't the one who wrote the tilecache tutorial and
I never tried to follow it. You can wait for Chris to show up (should
be online in some 5-6 hours) or ask on the tilecache mailing list.

Cheers
Andrea

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8

Kencana ha scritto:

Hi,

Thanks for the quick response. i guess while finding out the solution, i
should try
the first option. which is "enable the Geoserver meta tiler".
can i know how to enable this feature? i mean from what i read (the url gave
me)
i can't find out on how to make use of this feature. i am sorry hope you
don't mind
but can you explain on how to use the geoserver meta tiler feature?

You just have to add two parameters to your getmap request, tiled=yes
and tiles_origin with the coordinates of the lower left corner of the
first tile in your dataset (the lower left tile among the tiles).

The Geoserver map preview uses this feature. For example, one of the
tiles retrieved by the map preview has the following address:

http://localhost:8080/geoserver/wms?HEIGHT=256&WIDTH=256&LAYERS=tiger%3Astates&STYLES=&SRS=EPSG%3A4326&FORMAT=image%2Fpng&TILED=true&TILESORIGIN=-127.61950111389118%2C23.73517837524415&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&EXCEPTIONS=application%2Fvnd.ogc.se_inimage&BBOX=-127.619501%2C23.735178%2C-95.850636%2C55.504044

and the extra parameters that do enable meta tiling are:

...&TILED=true&TILESORIGIN=-127.61950111389118,23.73517837524415

You'll just have to discover what the lower left coordinate of
you map is and add it.

Also, we have a demo of Google Maps + Geoserver that is using
meta tiling in the next release. You can download a nightly
here http://geo.openplans.org/nightly/1.5.x/ and have a look
at the demo page.

Cheers
Andrea

9

Hi,

can i know the different of using either meta tiler or tile cache?
i mean, as you mentioned earlier that tilecache is better approach.
is it much faster?or there is only slight different

Thank you

Regards,
Kencana

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10

Kencana ha scritto:

Hi,

can i know the different of using either meta tiler or tile cache?
i mean, as you mentioned earlier that tilecache is better approach.
is it much faster?or there is only slight different

Only slight difference. You see the metatiler is active if you
have labels in your map and big polygons, because you can notice
the reduced replications of labels (without the meta tiler,
you get a label for each tile containing the polygon).

Cheers
Andrea

11

Hi,

please don't mind coz i keep asking question.
anyway, is there any formula to calculate the lower left coordinates?
the lower left coordinate you are saying is based on the map size is that
right?
lets say i set the map view frame 500 x 500. how can i get the lower left
coordinates then?
i mean how can i make sure that it get the correct tile, as user will pan,
zoom the map.
so how can i capture the lower left coordinates?

Thank you

Regards,
Kencana
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12

Kencana ha scritto:

Hi,

please don't mind coz i keep asking question.
anyway, is there any formula to calculate the lower left coordinates?
the lower left coordinate you are saying is based on the map size is that
right?
lets say i set the map view frame 500 x 500. how can i get the lower left
coordinates then?
i mean how can i make sure that it get the correct tile, as user will pan,
zoom the map.
so how can i capture the lower left coordinates?

Well, you configure Google maps to ask for a certain area no?
Please download the nightly I pointed you to and have a look at the
Google maps demo.
Generally speaking, it should be the lower left corner of the dataset
in your featuretype configuration (the lon/lat version, that is).

Cheers
Andrea

13

Hi,

Tilecache is supposed to be run through mod_python, cgi or similar,
not a Java app server like Jetty. However, I've bundled up an older
version of Tilecache as a Java web app (using Jython), which might be
worth a try. Other people have had success with this. Instructions
are here:

http://www.resc.rdg.ac.uk/twiki/bin/view/Resc/TileCacheAsJavaServlet

Unfortunately I have no time at present to work on this more, but if
anyone else wants to make improvements (e.g. using a new version of
Tilecache), please go ahead!

Cheers, Jon

On 8/2/07, Kencana <bluesky_dyx@anonymised.com> wrote:

Hi,

I have copy the tilecache folder by following the instruction.
however when i try to run the following url
http://localhost:1209/tilecache-1.8.1/
it returns me a map browser but instead of showing the map image it only
show me
2 boxes with pink background colour. does this means that the tilecache has
installed successfully?
how can i retrieve wms image from geoserver? what url should i use.
i try to access the following url
"http://localhost:1209/wms-c/tilecache.py?LAYERS=sigma&FORMAT=image/png&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG:4326&BBOX=103.7109375,1.2303741774326144,103.88671875,1.4061088354351594&WIDTH=256&HEIGHT=256&quot;

but it returns me :
HTTP ERROR: 404
NOT_FOUND
RequestURI=/wms-c/tilecache.py

Powered by jetty://

any idea of this?i am getting confused.hope you can help me out

Thank you

Regards,
Kencana

aaime wrote:
>
> Kencana ha scritto:
>> Hi,
>>
>> thanks for the information. is it possible to use tilecache with google
>> map?
>> how can i call the function to get the map image from google api?
>
> I think you can, but I've never tried.
> I guess this may help:
> http://openlayers.org/pipermail/tilecache/2007-July/000303.html
>
> Cheers
> Andrea
>
> -------------------------------------------------------------------------
> This SF.net email is sponsored by: Splunk Inc.
> Still grepping through log files to find problems? Stop.
> Now Search log events and configuration files using AJAX and a browser.
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> _______________________________________________
> Geoserver-users mailing list
> Geoserver-users@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/geoserver-users
>
>

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--
--------------------------------------------------------------
Dr Jon Blower Tel: +44 118 378 5213 (direct line)
Technical Director Tel: +44 118 378 8741 (ESSC)
Reading e-Science Centre Fax: +44 118 378 6413
ESSC Email: jdb@anonymised.com
University of Reading
3 Earley Gate
Reading RG6 6AL, UK
--------------------------------------------------------------

14

Jon Blower ha scritto:

Hi,

Tilecache is supposed to be run through mod_python, cgi or similar,
not a Java app server like Jetty. However, I've bundled up an older
version of Tilecache as a Java web app (using Jython), which might be
worth a try. Other people have had success with this. Instructions
are here:

http://www.resc.rdg.ac.uk/twiki/bin/view/Resc/TileCacheAsJavaServlet

Unfortunately I have no time at present to work on this more, but if
anyone else wants to make improvements (e.g. using a new version of
Tilecache), please go ahead!

Jon,
the JTileCache student (Google SoC) did try out running tilecache
inside Jython following your instructions (good work btw) but
a benchmark showed serving tiles right out of GeoServer was faster
than hitting TileCache run inside Jython.

Was your experience any different? Of course, I guess the timings
do depend on how complex is the map being tiled.

Cheers
Andrea

15

Hi Andrea,

I didn't do any benchmarking at all and to be honest I don't use it
myself (having developed a faster solution for my particular problem).
However, this is really useful information. Have you published these
results anywhere? If not, would you consider adding them to my
JTileCache Wiki page (I can give you a login)?

I wonder if we can achieve better performance in JTileCache by
compiling the Python code to Java classes instead of running it
interpreted through Jython...

Cheers, Jon

On 8/2/07, Andrea Aime <aaime@anonymised.com> wrote:

Jon Blower ha scritto:
> Hi,
>
> Tilecache is supposed to be run through mod_python, cgi or similar,
> not a Java app server like Jetty. However, I've bundled up an older
> version of Tilecache as a Java web app (using Jython), which might be
> worth a try. Other people have had success with this. Instructions
> are here:
>
> http://www.resc.rdg.ac.uk/twiki/bin/view/Resc/TileCacheAsJavaServlet
>
> Unfortunately I have no time at present to work on this more, but if
> anyone else wants to make improvements (e.g. using a new version of
> Tilecache), please go ahead!

Jon,
the JTileCache student (Google SoC) did try out running tilecache
inside Jython following your instructions (good work btw) but
a benchmark showed serving tiles right out of GeoServer was faster
than hitting TileCache run inside Jython.

Was your experience any different? Of course, I guess the timings
do depend on how complex is the map being tiled.

Cheers
Andrea

--
--------------------------------------------------------------
Dr Jon Blower Tel: +44 118 378 5213 (direct line)
Technical Director Tel: +44 118 378 8741 (ESSC)
Reading e-Science Centre Fax: +44 118 378 6413
ESSC Email: jdb@anonymised.com
University of Reading
3 Earley Gate
Reading RG6 6AL, UK
--------------------------------------------------------------

16

Jon Blower ha scritto:

Hi Andrea,

I didn't do any benchmarking at all and to be honest I don't use it
myself (having developed a faster solution for my particular problem).
However, this is really useful information. Have you published these
results anywhere? If not, would you consider adding them to my
JTileCache Wiki page (I can give you a login)?

I wonder if we can achieve better performance in JTileCache by
compiling the Python code to Java classes instead of running it
interpreted through Jython...

Hey Chris,
anything to add about this? I just reported what I saw in a mail.
Cheers
Andrea

17

It shouldn't be powered by Jetty, as I don't think it runs cgi programs. You need to put tilecache in to apache. Or if that's what you're doing, you need to run apache and jetty on different ports.

Also unless you have modpython set up and configured the url will be tilecache-1.8.1/tilecache.cgi. Not .py and not wms-c/

Chris

Kencana wrote:

Hi,

I have copy the tilecache folder by following the instruction.
however when i try to run the following url
http://localhost:1209/tilecache-1.8.1/
it returns me a map browser but instead of showing the map image it only
show me 2 boxes with pink background colour. does this means that the tilecache has
installed successfully?
how can i retrieve wms image from geoserver? what url should i use.
i try to access the following url
"http://localhost:1209/wms-c/tilecache.py?LAYERS=sigma&FORMAT=image/png&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG:4326&BBOX=103.7109375,1.2303741774326144,103.88671875,1.4061088354351594&WIDTH=256&HEIGHT=256&quot;

but it returns me :
HTTP ERROR: 404
NOT_FOUND
RequestURI=/wms-c/tilecache.py

Powered by jetty://

any idea of this?i am getting confused.hope you can help me out

Thank you

Regards,
Kencana

aaime wrote:

Kencana ha scritto:

Hi,

thanks for the information. is it possible to use tilecache with google
map?
how can i call the function to get the map image from google api?

I think you can, but I've never tried.
I guess this may help:
http://openlayers.org/pipermail/tilecache/2007-July/000303.html

Cheers
Andrea

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18

Hi Jon,

I have installed mod_python and i am trying to test the tilecache by
accessing the following url:
"http://localhost:9090/tilecache-1.8.1/tilecache.py?LAYERS=basic&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&SRS=EPSG:4326&BBOX=-180,-90,0,90&WIDTH=256&HEIGHT=256&quot;

but i get the following result:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable
to complete your request.

I check the error log file and it is written "ImportError: No module named
TileCache.Service"

any idea on how to fix this?

Thank you

Regards,
Kencana
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19

Hi,

I'm afraid I'm not really a Tilecache expert, so I suggest you post
this to the Tilecache mailing list - no doubt someone there will know
exactly what's going on! :wink:

Jon

On 8/3/07, Kencana <bluesky_dyx@anonymised.com> wrote:

Hi Jon,

I have installed mod_python and i am trying to test the tilecache by
accessing the following url:
"http://localhost:9090/tilecache-1.8.1/tilecache.py?LAYERS=basic&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&SRS=EPSG:4326&BBOX=-180,-90,0,90&WIDTH=256&HEIGHT=256&quot;

but i get the following result:
Internal Server Error
The server encountered an internal error or misconfiguration and was unable
to complete your request.

I check the error log file and it is written "ImportError: No module named
TileCache.Service"

any idea on how to fix this?

Thank you

Regards,
Kencana
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--
--------------------------------------------------------------
Dr Jon Blower Tel: +44 118 378 5213 (direct line)
Technical Director Tel: +44 118 378 8741 (ESSC)
Reading e-Science Centre Fax: +44 118 378 6413
ESSC Email: jdb@anonymised.com
University of Reading
3 Earley Gate
Reading RG6 6AL, UK
--------------------------------------------------------------

20

Here is what I originally wrote about performance testing the Jython-based TileCache:
http://whitney.textdriven.com/blog/2007/06/20/testing-out-jon-blowers-jython-powered-tilecache/

My "performance testing" was basically a quick look at the requests / time statistics given by Tomcat for both Geoserver and TileCache after playing with the OpenLayers front-end for a few minutes.

After fighting a few problems, I have Jon Blower's Jython TileCache running again. I also have a preliminary version of my tile cache, JTileCache, running with JCS. I did a quick test:

-- Tomcat with 256 MB allocated
-- Each test is a fresh restart of Tomcat, followed by a first run (to populate any cache), then a few following runs to establish a consistent time
-- The test is to fetch the same 20 sort-of-random image tiles from topp:states (in jpeg)
-- Time is established based on 'time curl...', so probably only useful for relative time comparisions

Geoserver:
1st run: 1.964s
Consecutive runs: ~1.1s

Jon Blower's Jython TileCache (disk cache cleared on first run):
1st run: 4.450s
Consecutive runs: ~0.25s

JTileCache (with LRU memory cache only):
1st run: 3.685s
Consecutive runs: ~0.41s

So, assuming the test overhead is minimal:

Geoserver: ~0.9 requests / sec
Jython TileCache: ~4 requests / sec
JTileCache: ~2.4 requests / sec

[ Looks like I have some work to do ... and next time I should actually test before jumping to conclusions :wink: ]

I think it would be useful to repeat these tests with a more complicated map and a better tile-fetcher (aka cache seeder).

-- Chris Whitney

On Aug 2, 2007, at 7:01 AM, Andrea Aime wrote:

Jon Blower ha scritto:

Hi Andrea,
I didn't do any benchmarking at all and to be honest I don't use it
myself (having developed a faster solution for my particular problem).
However, this is really useful information. Have you published these
results anywhere? If not, would you consider adding them to my
JTileCache Wiki page (I can give you a login)?
I wonder if we can achieve better performance in JTileCache by
compiling the Python code to Java classes instead of running it
interpreted through Jython...

Hey Chris,
anything to add about this? I just reported what I saw in a mail.
Cheers
Andrea