Thanks Imran,
After writing my mail to this list I've continued trying and found that if
I don't use palette: 'safe' in OpenLayers the speed is as expected: fast.
The size of the tiles grow a bit (20%) but the overall speed improvement is
huge.
I don't have a specific reason the use the palette option, I just came
across it while learning OL.
I still want to know where the tiles go to on the server, just to
understand it better.
Thanks,
Paul
--
Organizing the International Open Source GIS conference 2012 in The
Netherlands:
http://www.mapwindow.org/conference/2012/
2012/5/7 Imran Rajjad <raj...@gmail.com>
> can you please post your openlayers code for that cached layer? and what
> j2ee container are you using?
>
> regards,
> Imran
>
> On Mon, May 7, 2012 at 5:05 PM, Paul Meems <bontepaar...@gmail.com> wrote:
>
>> Hi,
>>
>> I'm new to this list. I'm Paul I'm from The Netherlands and I'm in the
>> process of making a simple WebGIS with just viewing capabilities.
>> I have a cloud server running Ubunto. GeoServer v2.1.3 and PostGreSQL
>> v9.1 with PostGIS.
>>
>> All is running well except for the performance. It takes very long to
>> show my WMS data in OpenLayers.
>> I have enabled GeoWebCache and am using tiled: true, format: 'image/png8'
>> and palette: 'safe'.
>>
>> I have pre-seeded my layer and I see on the Cached Layers page of the
>> GeoServer admin that it is using 44MB.
>> So far so good, but somehow I'm not certain my OpenLayers application is
>> using these tiles. Also because I would suspect that even if I didn't
>> seeded correctly the tiles would be generated on the fly.
>> And thus following visits to my page would be faster. But my initial
>> start at zoom level 12 and I need 46 tiles, this takes between 2.5 and 3
>> minutes to load.
>> Much to slow!
>> The tile sizes are from 35kB - 290b.
>> This is the request I make;
>>
>> http://myIP/geoserver/myApp/wms?LAYERS=myLayername&FORMAT=image%2Fpng8&TRANSPARENT=TRUE&PALETTE=safe&TILED=true&SERVICE=WMS&VERSION=1.1.1&REQUEST=GetMap&STYLES=&SRS=EPSG%3A3857&BBOX=728903.50162598,6980840.9182568,733795.47143555,6985732.8880664&WIDTH=256&HEIGHT=256
>>
>> I tried looking for the tiles on my Ubunto server. I was expected a
>> directory structure with a lot of subdirs with numbers (zoomlevels, X and
>> Y) and eventually the png files.
>> But I can't find it. I must say I'm still a novice with Ubuntu so I might
>> not be searching correctly or the tiles are not saved to disk.
>>
>> Can anybody point me in the correct direction about solving this
>> performance issue?
>>
>> Thanks,
>>
>> Paul
>>
>> --
>> Organizing the International Open Source GIS conference 2012 in The
>> Netherlands:
>> http://www.mapwindow.org/conference/2012/
>>
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>>
>
>
> --
> I.R
>
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