Hi, We are testing solr 4.3.0 in Tomcat (considering upgrading solr 3.6.1 to 4.3.0), we have many cores (a few thousands). We have noticed solr 4.3.0 memory usage is much higher than solr 3.6.1 (without using solr cloud yet). With 2K cores, solr 3.6.1 is using 1.5G, but solr 4.3.0 is using close to 3G memory, when Tomcat is initially started. We used shareSchema and sharedLib, we also disabled searcher warm-up during startup. We are still debugging the issue, we would appreciate if you could provide any guidance? Thanks very much for helps, Lisheng
