Am 03.06.2010 16:45, schrieb Andrzej Bialecki: > You are right to a certain degree. Still, there are some contention > points in Lucene/Solr, how threads are allocated on available CPU-s, and > how the heap is used, which can make a two-JVM setup perform much better > than a single-JVM setup given the same number of threads...
Allow me to don't belive this! ;-) It's not Solr that allocates threads, it's the web server (Jetty, Glassfish, or whatever). In a normal configuration, it will use as many threads as useful, so that there's no need to start a second web server on the same machine. To Lucene, there is some magic algorithm that reuses an IndexReader by a limited number of threads (as far as I have seen in the code, but the details are unimportant). But to the very least, if you've a multi core setup, you'll get special IndexReader instances from Lucene per core. So I don't see why you should scatter them on different VMs. Greetings, Michael
