You only need so much for Solr so it can do its thing. Faceting can take quite some memory on a large index but sorting can be a really big RAM consumer.
As Erick pointed out, inspect and tune the cache settings and adjust RAM allocated to the JVM if required. Using tools like JConsole you can monitor various things via JMX including RAM consumption. > Hi, > > I know this is a subjective topic but from what I have read it seems more > RAM should be spared for OS caching and much less for SOLR/Tomcat even on a > dedicated SOLR server. > > Can someone give me an idea about the theoretically ideal proportion b/w > them for a dedicated Windows server with 32GB RAM? Also the index is > updated every hour.
