[mapserver-users] Using Fast CGI with MapServer to alleviatepoor performance

[Guillaume Sueur]

doesn't mapserver have to scan the whole epsg file to find the matching
 epsg - proj pair ?

Steve Lime a écrit :
> This shouldn't be the case, there are tests in the main API code to test
> projections of the map
> against layers to avoid this. I suspect it's projection related
> though...
> 
> Steve
> 
>>>> On 9/19/2008 at 11:19 AM, in message
> <48D3D0F9.5040904 at neogeo-online.net>,
> Guillaume Sueur <guillaume.sueur at neogeo-online.net> wrote:
>> I guess that wms makes a reprojection job as the request comes with
> an
>> EPSG code and the map projection is set by a proj string. Even if
> they
>> are equivalent, can MapServer know that and forget about reprojection
> ?
>> The cgi is rather straight forward as no EPSG is required. As the
> layers
>> don't have PROJECTION blocks, they are drawn straight forward.
>>
>> my 2 cents.
>>
>> Guillaume
>>
>> Christopher Schmidt a écrit :
>>> On Fri, Sep 19, 2008 at 03:34:42PM +0100, John Westwood wrote:
>>>> Hi Everybody,
>>>>
>>>> I am attaching  a cut down version of my html, javascript and map
> files. On 
>> our server the EmbeddedMap.js lives in the OpenLayers directory and
> is used 
>> by gbhgis_openlayers.html.
>>>> The test address http://148.197.8.119/gbhgis_openlayers.html . This
> is just 
>> a test server so please don't tell the whole World about it! :)
>>>> There are four layers, 2 x raster (europe 1940s, WMS and MapServer)
> and 2 x 
>> vector / raster (Digital Chart of the World, WMS and MapServer) .
>>> Okay, so to cut OpenLayers out of the loop:
>>>
>>>
> http://148.197.8.119/cgi-bin/mapserv?map=/data/map-files/gbhgis.map&service=WMS&L
> 
> AYERS=europe&FORMAT=image%2Fpng&VERSION=1.1.1&REQUEST=GetMap&STYLES=&EXCEPTIONS=ap
> plication%2Fvnd.ogc.se_inimage&SRS=epsg%3A3034&BBOX=2097152,2097152,4194304,419
>> 4304&WIDTH=256&HEIGHT=256
>>>
> http://148.197.8.119/cgi-bin/mapserv?map=/data/map-files/gbhgis.map&layers=europ
> 
> e&format=image%2Fpng&mode=map&map_imagetype=png&mapext=2097152+2097152+4194304+41
> 94304&imgext=2097152+2097152+4194304+4194304&map_size=256+256&imgx=128&imgy=128&im
>> gxy=256+256
>>> The former is WMS, the latter is not-WMS.
>>>
>>> There is a very obvious speed difference between the two.
>>>
>>> The reason the MapServer image has its colors wrong, for the record,
> is
>>> because it is using 8bit pngs instead of 24 bit pngs. My first
>>> impression was that was the reason for the difference, but
>>> unfortunately, 8bit gifs don't seem to fare any better.
>>>
>>> Time for the URLs:
>>>
>>> MapServer: real    0m0.660s
>>> WMS: real   0m2.707s
>>>
>>> These may help someone who knows MapServer investigate more.
>>>
>>> Regards,
>> _______________________________________________
>> mapserver-users mailing list
>> mapserver-users at lists.osgeo.org 
>> http://lists.osgeo.org/mailman/listinfo/mapserver-users
> 
> 

-- 
Guillaume SUEUR
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Neogeo Technologies SARL
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