[infinispan-dev] benchmarking ideal distribution

[Mircea Markus]

On 2 Feb 2011, at 14:47, Galder Zamarreño wrote:

> Some comments, in:
> 
> name="idealdistribution/dist-sync-ideal-distribution.xml" useEvenHashing="true
> 
> Does dist-sync-ideal-distribution.xml differ in any way to dist-sync.xml? The reason I ask is cos reading the wiki, it seems like useEvenHashing "makes Infinispan plugin to use the ideal consistent hashing implementation rather than the configured one".
Good point. I've removed useEvenHashing and leave the hash to be configured in ISPN. 
> 
> So, if dist-sync-ideal-distribution.xml and dist-sync.xml are different, in which way are they different and way? Seems like RadarGun could already make the changes the necessary to  make dist-sync use ideal CH?	
Now they would be different in the consistent hashing class used. 
> 
> Reading futther, it seems like Infinispan config must have:
> <hash numOwners="2" rehashEnabled="false" rehashRpcTimeout="60000" class="org.radargun.cachewrappers.EvenSpreadingConsistentHash"/>
> 
> I think RadarGun could do these modifications without forcing users to have a separate dist-sync-*.xml file.
+1. Just that right now Radargun relies on the name of the file in order to include it in the report, so two different files should be configured.
This needs to change: https://sourceforge.net/apps/trac/radargun/ticket/19
> 
> Also, if useEvenHashing="true", can't the code handling the config take the benchmarks numOfThreads and assign it to threadsPerNode? 
> 
> Also, you're saying that WebSessionBenchmark.numOfThreads and keysPerThread must be the same but in the wiki they're not. Also, as per my last comment, if there's a relationship between keysPerThread and the benchmark config, couldn't the RadarGun figure that out?
Indeed! https://sourceforge.net/apps/trac/radargun/ticket/20
> 
> Thanks for writing this up!
Thanks again for the excellent feedback!

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