For an interesting opinion on Solr implementations search for ‘The Seven Deadly Sins of Solr’.
Quick kill basic Solr cache tuning parameters for an operational instance of apachesolr-3.6.2 in ‘solr/conf/solrconfig.xml’ could be as follows:
<filterCache class="solr.FastLRUCache" size="16384" initialSize="4096" autowarmCount="4096"/> <queryResultCache class="solr.LRUCache" size="16384" initialSize="4096" autowarmCount="4096"/> <documentCache class="solr.LRUCache" size="16384" initialSize="4096" autowarmCount="4096"/>
Sources:
http://wiki.apache.org/solr/SolrCaching
http://e-mats.org/2009/06/how-to-make-solr-go-45-faster/
http://h3x.no/2011/05/10/guide-solr-performance-tuning
