[mapguide-users] GDAL -- Failed to stylize layer... Cannot create any more connections to the OSGeo.Gdal FDO provider

[Zac Spitzer]

mg 2.0 currently has similar problems with rasters

there are some related trac tickets

http://trac.osgeo.org/mapguide/ticket/462
http://trac.osgeo.org/mapguide/ticket/451
http://trac.osgeo.org/mapguide/ticket/533

On Tue, Apr 22, 2008 at 5:34 PM, Pascal Coulon
<pascal.coulon at atkinsglobal.com> wrote:
>
>  Dear All,
>
>  I have run a series of stress test on raster layers, using a URL of the
>  following sort:
>  http://10.XXX.XX.71/mapguide/mapagent/mapagent.fcgi?OPERATION=GETMAPIMAGE&VERSION=1.0.0&MAPNAME=Browser_Default&LOCALE=EN&MAPDEFINITION=Library://PILOT_TEST/Maps/MainMap.MapDefinition&FORMAT=PNG&SETVIEWCENTERX=190722&SETVIEWCENTERY=205644&SETVIEWSCALE=8600&SETDISPLAYDPI=78&SETDISPLAYWIDTH=600&SETDISPLAYHEIGHT=600&USERNAME=Administrator&PASSWORD=XXXX.
>  The idea was to test the actual MapGuide server rather than any application
>  using the underlying map server. I have gradually increased the number of
>  concurent users on various raster layers. I got some excellent results on
>  most of the raster layers. However, on one specific rather layer (UK
>  Ordnance Survey Aerial Images - 8.6GB), the system started to crash with
>  only two concurent users.  http://www.nabble.com/file/p16823109/Error.log
>  Error.log On inpestecting the error log (see attached file), I noticed the
>  following error being logged:
>
>  Error: Failed to stylize layer: OS_AerialPhotography_SN
>         Cannot create any more connections to the OSGeo.Gdal FDO provider.
>
>  I had created a raster catalogue
>  (http://trac.osgeo.org/fdo/wiki/FdoGdalNotes); which had help on the smaller
>  rater dataset. But for this larger dataset, I did not get any benefit.
>
>  I understand that the GDLA library is single threaded. This means that if
>  too many requests are queue in the stak, it might eventually time out and
>  then through the above error. However, this error seemed to be logged before
>  any set time out.
>
>  For completness, here is the following plateform specifications:
>
>  OS: Windows 2003 Server SP2
>  CPU: 2.20 GH
>  RAM: 3.62GB
>  MGOS 1.2
>
>  Would an upgrade to MGOS 2.0 provides any benefits?
>  Can anyobody suggest a way for handling very large raster dataset?
>
>  Any help would be much apprecaited.
>
>  Pascal
>
>
>  --
>  View this message in context: http://www.nabble.com/GDAL----Failed-to-stylize-layer...-Cannot-create-any-more-connections-to-the-OSGeo.Gdal-FDO-provider-tp16823109s16610p16823109.html
>  Sent from the MapGuide Users mailing list archive at Nabble.com.
>
>  _______________________________________________
>  mapguide-users mailing list
>  mapguide-users at lists.osgeo.org
>  http://lists.osgeo.org/mailman/listinfo/mapguide-users
>



-- 
Zac Spitzer -
http://zacster.blogspot.com (My Blog)
+61 405 847 168