[Opensim-dev] Memory cache

[Stefan Andersson]

If the cache is releasing objects, I think we might well be seeing LOH fragmentation.

http://msdn.microsoft.com/en-us/magazine/cc534993.aspx

 

The solution would then be to break the binaries apart into byte cucks smaller than the LOH trshold.


Best regards,
Stefan Andersson



 
> From: adam at deepthink.com.au
> To: opensim-dev at lists.berlios.de
> Date: Wed, 20 May 2009 17:21:51 -0400
> Subject: Re: [Opensim-dev] Memory cache
> 
> We are using an external caching library I believe, it could be sitting in there.
> 
> Adam
> 
> > -----Original Message-----
> > From: opensim-dev-bounces at lists.berlios.de [mailto:opensim-dev-
> > bounces at lists.berlios.de] On Behalf Of Melanie
> > Sent: Wednesday, 20 May 2009 1:56 PM
> > To: opensim-dev at lists.berlios.de
> > Subject: Re: [Opensim-dev] Memory cache
> > 
> > The surprise really is that the cache would be a performance loss
> > instead of a performance gain. What is there that makes it so slow?
> > 
> > Melanie
> > 
> > Frisby, Adam wrote:
> > > As chief engineer aboard the USS OSgrid, I might want to recommend
> > against this.
> > >
> > > Not having the sims cache assets will mean that every asset request
> > will hit the core asset server which in turn will result in higher
> > bandwidth requirements for it in the long run. It doesn't appear to
> > have made a huge impact on our bandwidth charts for this week yet -
> > however I wouldn't be surprised if it did if everyone did this.
> > >
> > > Adam
> > >
> > > From: opensim-dev-bounces at lists.berlios.de [mailto:opensim-dev-
> > bounces at lists.berlios.de] On Behalf Of Nebadon Izumi
> > > Sent: Wednesday, 20 May 2009 10:19 AM
> > > To: diva at metaverseink.com; opensim-dev at lists.berlios.de
> > > Subject: Re: [Opensim-dev] Memory cache
> > >
> > > Yay for mistakes that end in gains!!! of course if anyone asks i
> > planned this ;P anyway i thought people would like to see my ini
> > changes.. this is what lead to the discovery:
> > >
> > > [OpenSim.ini]
> > > ; The following is the configuration section for the new style
> > grid servers
> > > ; If you don't know what this is, don't enable it. It will eat
> > your data,
> > > ; format your hard drive and make all meat in your fridge spoil.
> > > ; You have been warned.
> > > ; Some of this is starting to work!
> > > [Modules]
> > > ; Choose one
> > > ;AssetServices = "LocalAssetServicesConnector"
> > > AssetServices = "RemoteAssetServicesConnector"
> > > ;AssetServices = "HGAssetBroker"
> > >
> > > ; If you don't want asset caching in the regions, comment this
> > > AssetCaching = "CoreAssetCache" ;<<<---*** SEE ERROR HERE ***---
> > ->>>
> > >
> > > ; Choose one
> > > ;UserServices = "LocalUserServicesConnector"
> > > UserServices = "RemoteUserServicesConnector"
> > >
> > >
> > > [AssetService]
> > > ; Parameters for local assets, formerly known as "standalone"
> > > LocalServiceModule =
> > "OpenSim.Services.AssetService.dll:AssetService"
> > > StorageProvider = "OpenSim.Data.SQLite.dll"
> > > ;StorageProvider = "OpenSim.Data.MySQL.dll"
> > > ;ConnectionString = "Data Source=localhost;Database=opensim;User
> > ID=opensim;Password=opensim;"
> > > DefaultAssetLoader =
> > "OpenSim.Framework.AssetLoader.Filesystem.dll"
> > > AssetLoaderArgs = "assets/AssetSets.xml"
> > >
> > > ; Parameters for remote assets, formerly known as "grid"
> > > AssetServerURI = "http://assets.osgrid.org:8003/"
> > >
> > > ; Paremeters for the Hypergrid connector
> > >
> > > ;; Parameters for the HG Broker
> > > ; Use this one if you have a standalone grid
> > > ;LocalGridAssetService =
> > "OpenSim.Services.AssetService.dll:AssetService"
> > > ; Use this one if this sim is connected to a grid-wide asset
> > server
> > > ;LocalGridAssetService =
> > "OpenSim.Services.Connectors.dll:AssetServiceConnector"
> > > ;HypergridAssetService =
> > "OpenSim.Services.AssetService.dll:HGAssetService"
> > >
> > > [AssetCache]
> > > ; Number of buckets for assets
> > > CacheBuckets = 32768
> > >
> > > [UserService]
> > > ;LocalServiceModule =
> > "OpenSim.Services.UserService.dll:UserService"
> > >
> > > [/OpenSim.ini]
> > >
> > > Please test this out and see if you see gains too and let us know.
> > >
> > > Neb
> > >
> > >
> > >
> > > ---------------------------------------------------------------------
> > ---
> > >
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