Hi Andrea,
Thanks for the answer.
I've disabled the Tile recycling option and i've seen no OOM's today :)
Geoserver shows stable performance now so hopefully the configuration is ok
now.
Is there a reason why the geoserver gets much slower (approx. 1 second per
WMS request)
when using -XX:+UseConcMarkSweepGC and -XX:+CMSClassUnloadingEnabled?
Best regards,
Sjoerd Brandsma
On Thu, Nov 18, 2010 at 9:24 PM, Andrea Aime
<[email protected]>wrote:
> On Thu, Nov 18, 2010 at 6:12 PM, Sjoerd Brandsma <[email protected]>
> wrote:
> > Hi,
> >
> > I'm using geoserver 2.0 to serve the following data:
> >
> > - approx. 1TB of ECW aerial image data as WMS
> > - approx. 10GB of OSM vectordata in a PostGIS DB as PNG (street overlay)
> > in the following configuration:
> >
> > - Win2008 64 bit dual xeon (16 core) with 16GB ram
> >
> > Java configuration:
> > -XX:+HeapDumpOnOutOfMemoryError
> > -XX:MaxPermSize=256m
> > -Xmx1300M
> > -server
> > (I'm not using -XX:+UseConcMarkSweepGC and -XX:+CMSClassUnloadingEnabled
> > because this seems to slow down wms requests significantly)
> >
> >
> > JAI settings:
> > Memory Capacity: 0.8
> > Memory Threshold: 0.75
> > Tile Threads: 15
> > Tile Threads Priority: 8
> >
> > Tile recycling switched on
> > Image I/O caching switched on
> > JPEG Native Acceleration switched on
> > PNG Native Acceleration switched on
> > Mosaic Native Acceleration swtiched on
> >
> > Average WMS requests per second: 10
> > Average resolution of a WMS request: 800x600 pixels.
> >
> > Approx. one time per day I'm getting a GC overhead limit exceeded.
> > (In the past I got much more 'out of memory' exceptions but that seemed
> to
> > be caused by using the 'dashed-line' SLD option for rendering the OSM
> data.
> > After removing this (is this a known problem in Geoserver 2.0?) it got
> much
> > better)
> >
> > I've analyzed the hprof file using Eclipse Memory Analyzer which gives me
> > the following message:
> >
> > One instance of "javax.media.jai.RecyclingTileFactory" loaded by
> > "sun.misc.Launcher$ExtClassLoader @ 0x14ba07d8" occupies 1.044.494.000
> > (83,03%) bytes. The instance is referenced by
> > it.geosolutions.imageio.imageioimpl.imagereadmt.ImageReadOpImageMT @
> > 0x5de81358 , loaded by "GeoServer". The memory is accumulated in one
> > instance of "java.util.HashMap$Entry[]" loaded by "<system class
> loader>".
> >
> > Keywords
> > sun.misc.Launcher$ExtClassLoader @ 0x14ba07d8
> > java.util.HashMap$Entry[]
> > javax.media.jai.RecyclingTileFactory
> > GeoServer
> >
> > This is not really surprising because i've enabled Tile recycling and a
> > memory capacity of 0.8
> >
> > Couple of questions here:
> >
> > - Am I using the correct settings? (Should tile recycling be switched
> off?)
>
> Switched off. In my experience It also hampers scalability
>
> > - Would this option help me? -XX:-UseGCOverheadLimit
> > - Could there be a memory leak in the 'other' 20% of the allocated
> memory?
>
> There is a know WFS memory leak in released versions of GeoServer.
> It may account for the rest of the user memory, or at least part of it.
> The memory leak should be not there anymore in recent 2.0.x nightly
> builds.
>
> Cheers
> Andrea
>
> -----------------------------------------------------
> Ing. Andrea Aime
> Senior Software Engineer
>
> GeoSolutions S.A.S.
> Via Poggio alle Viti 1187
> 55054 Massarosa (LU)
> Italy
>
> phone: +39 0584962313
> fax: +39 0584962313
>
> http://www.geo-solutions.it
> http://geo-solutions.blogspot.com/
> http://www.linkedin.com/in/andreaaime
> http://twitter.com/geowolf
>
> -----------------------------------------------------
>
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