Are you using a < 1.4 version of Solr? It has since been improved for multi-
threaded scalability such as a lot of neat non-blocking components. It's been 
a long time ago since i saw a Solr server not taking advantage of multiple 
cores. Today, they take 200% up to even 1200% CPU time when viewing with top.

Here's one running at almost 700% processing 450+ queries/second.
15522 markus    20   0 2432m 859m  10m S  698 10.8   2:05.41 java               
                                                     

> Is there a way to allow Solr to use multiple CPUs of a single, multi-core
> box, to increase scale (number of documents, number of searches) of the
> searchbase?
> 
> The CoreAdmin wiki page talks about "Multiple Cores" as essentially
> independent document bases with independent indexes, but with some
> unification of administration at the grosser levels. That's not quite what
> I'm looking for, though. I want a single URL for add and search access,
> and a single logical searchbase, but I want to be able to use more of the
> resources of the physical box where the searchbase runs.
> 
> I guess I thought I would get this for free, it being Java and all, but I
> don't seem to: even with hundreds of clients adding and searching, I only
> seem to use one hardware core, and a bit of a second (which I interpret to
> mean "one Java thread for Solr, one Java thread for Java I/O").
> 
> -==-
> Jack Repenning
> Technologist
> Codesion Business Unit
> CollabNet, Inc.
> 8000 Marina Boulevard, Suite 600
> Brisbane, California 94005
> office: +1 650.228.2562
> twitter: http://twitter.com/jrep

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