[Opensim-dev] Memory cache

[Justin Clark-Casey]

diva at metaverseink.com wrote:
> I noticed we have GlynnTucker.Cache.dll in the distribution, and this 
> wasn't being used. I have no idea what the story is, but since it's 
> there, I did one alternative cache module implementation using it, just 
> to see what happens. Since everything is modularized now, replacing the 
> asset cache implementation is as simple as editing your XXXCommon.ini 
> and changing the name:
> 
> ;AssetCaching = "CoreAssetCache"
> AssetCaching = "GlynnTuckerAssetCache"
> 
> I would still urge that someone figures out what's wrong with 
> OpenSim/Framework/Cache.cs, which is the one used in CoreAssetCache.

fyi, the GlynnTucker library was being used until recently in the original 
OpenSim/Framework/Communications/Cache/AssetCache.cs, which is why it's there.

It seems incredible that performance would be better without a cache unless available memory is extremely low.

> 
> The GlynnTuckerAssetCache has been tried in the UCI Grid and in some 
> sims in OSGrid and at least it's not being an anti-cache. Let's wait a 
> few more days to see if it's being a real cache; if so we should see 
> declines on the traffic to the asset servers :-)
> 
> Arthur Valadares wrote:
>> If we ran a profiling with this cache maybe we could see where the 
>> bottle neck is, couldn't we?
>>
>> Mono has simple statistical profiler that shouldn't be too intruding:
>>
>> $ mono --profile=default:stat program.exe
>>
>> If anyone who saw this performance loss could test this, would be 
>> interesting to see where it's spending all this extra time.
>>
>> On Tue, 2009-05-26 at 10:57 -0700, diva at metaverseink.com wrote:
>>> Just a quick note to inform everyone that word from osgrid folks 
>>> indicates that the asset cache is still borked and still a mystery. When 
>>> it is on, CPU usage spikes to unsustainable values (150% with 4 avies in 
>>> WP).
>>>
>>> If anyone cares to take a look at it / replace it with something else, 
>>> please do.
>>>
>>> OpenSim/Framework/Cache.cs
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justincc
Justin Clark-Casey
http://justincc.wordpress.com