[mapguide-users] MGOS server harware & bandwidth

[Andy Morsell]

Regarding the slow user experience on consumer level internet connections:
if you change the format for the map requests from PNG to JPG, the end-user
performance increase is profound.  Especially in the case of raster imagery
layers in the background - each map request will drop from about 1 MB to
less than 100 KB.  Of course, there are cons to this approach: PNG looks
better and if you're using base layer tiles than you must use PNG for the
transparency of the overlying dynamic layers.
 
For those wondering, you can change this by editing the ajaxmappane.temp
file.  Change the FORMAT=PNG parameter to JPG in the RequestMapImage()
function.
 

Andy Morsell, P.E. 
Spatial Integrators, Inc. 
http://www.SpatialGIS.com 

  _____  

From: mapguide-users-bounces at lists.osgeo.org
[mailto:mapguide-users-bounces at lists.osgeo.org] On Behalf Of Trevor Wekel
Sent: Friday, July 20, 2007 9:46 AM
To: MapGuide Users Mail List
Subject: RE: [mapguide-users] MGOS server harware & bandwidth



Hi Jorge,

 

I have tried using MGOS over a 1Mbit "home" connection.  Personally, I think
it is too slow and the user experience is disappointing.  I would suggest
starting at 10Mbit/s.  If you are using tiled maps, a single CPU can serve
between 50 and 200 tiles per second.  Assuming each tile is 10kbytes, the
burst traffic rates will be between 5Mbit/sec and 20Mbit/sec.  

 

Just as a side note, under "lab" conditions with a quad core Intel Core 2
box I have been able to saturate a 100Mbit/s Ethernet line using
pre-generated tiles. 

 

MapGuide interactivity is quite dependant on burst rates.  From what I have
heard, "unmetered" bandwidth plans are often oversubscribed.  Even you have
a 10Mbit plan, you may never be able to obtain that rate if there are a 100
other sites sharing the same pipe.  If you are looking to host somewhere,
ask your ISP what you can realistically expect as a burst rate. 

 

  

Thanks,

Trevor

 

 

From: Jorge Rubio [mailto:j.e.rubio at gmail.com] 
Sent: Friday, July 20, 2007 9:06 AM
To: MapGuide Users Mail List
Subject: [mapguide-users] MGOS server harware & bandwidth

 

Hi list

 

I would like to know what kind of hardware are you using as server and the
bandwith recomended.

Just to have an idea...



-- 
Lic. Jorge Rubio 

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