fireAllRules will only fire all the rules that where activated during the insertion phase. So basically when you call it at the end, it will only fire all those rules activated. If you insert a fact that doesn't activate any rule you don't need to call fire all rules. On Tue, Jul 27, 2010 at 1:54 PM, sjoo822 <sean.joo(a)gmail.com&gt; wrote: > > I have several thousand objects that gets inserted into a statefull > knowledge > session as show below: > >           for (Item item : itemList) >           { >                 session.insert(item); >           } > >           session.fireAllRules(); > > > Assuming that all the conditions in the rules only concern with one item > at > a time, will there be a big performance difference if I changed the above > to > as shown below? > >          for (Item item : itemList) >          { >               session.insert(item); >               session.fireAllRules(); >          } > -- > View this message in context: > http://drools-java-rules-engine.46999.n3.nabble.com/fireAllRules-performa... > Sent from the Drools - User mailing list archive at Nabble.com. > _______________________________________________ > rules-users mailing list > rules-users(a)lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users --  - CTO @ http://www.plugtree.com  - MyJourney @ http://salaboy.wordpress.com  - Co-Founder @ http://www.jbug.com.ar  - Salatino "Salaboy" Mauricio - _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users