[mapserver-users] MapServer 5.2.1 performance

[Christopher Schmidt]

On Wed, Sep 02, 2009 at 09:10:54AM -0500, Andy Colson wrote:
>>
>> * I see that most of the layers spent around 0,015 seconds for each. Some layers spent around 0.25 seconds and I could see that these layers have few geometries very complex (I try to break these geometries in others simpler)
>
> As I see it, you have two options:
>
> 1) Make an individual request faster (hard to do)
> 2) Reduce the number of requests (easier, and different options)
>
> Do you really need all 120 layers?  For one tile you have to make 120  
> requests.  If it takes 4 tiles to fill out your map, thats 4 * 120 = 480  
>  requests.  If you could combine a few layers you would reduce the  
> number of requests, and improve performance.

Er, I think your'e confused. His *mapfile* has 120 layers -- 40 of which
are 'within range', 80 of which are not, and he's putting those
40 layers into one tile. (This is large, but not excessive; the Boston 
Freemap had something like 60 layers, and was a pretty simple map, all
things considered.)

I could be reading this wrong, but I think you're misunderstanding the
problem.

-- Chris


> Have you tried using multiple urls in OpenLayers?
>
> see:
> http://openlayers.org/dev/examples/multiserver.html
>
> Have you used firebug to watch it load?  It has a nice pretty graph that  
> shows which requests are concurrent, the time for each, etc, etc.
>
> If you can switch any of your layers to load as a single tile that would  
> also cut down the number of requests (from 4 to 1 in the example above).
>
>
> -Andy
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-- 
Christopher Schmidt
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