Having played with merge parameters and various index parameters, it seems 
possible to change the I/O usage at the cost of the number of index files. 
However, it does appear that this version of lucene is using more CPU.  Is 
there any reason for this ? is it normal ? We can push a large amount of 
documents through the indexer and it seams to work admirably although I would 
be happier if the load average came down.

Any lucene devs out there who could shed some light on this behaviour ?


Thanks,
Clive


________________________________
 From: kiwi clive <kiwi_cl...@yahoo.com>
To: "java-user@lucene.apache.org" <java-user@lucene.apache.org> 
Sent: Wednesday, November 7, 2012 10:58 AM
Subject: Lucene 3.6.0 high CPU usage
 
Hi Guys,

Having upgraded from lucene2.3.2 to lucene3.6.0 and jumping through a few 
hoops, we note that the CPU usage on the new version is perhaps 20-30% higher. 
The i/o wait appears about the same on both versions.

Can anyone suggest why this should be so or is the newer lucene version just 
more CPU hungry? If not, any tuning suggestions to reduce CPU usage would be 
gratefully received !

Thanks
Clive

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