Christian Stöber wrote: > Hello list, > > we are about to migrate our webserver cluster from Jetty 5.1.14 to > Tomcat 6.0.20. Currently there are four servers in our cluster with > simple load balancing and no session clustering. > > At the moment we are testing Tomcat on 2 nodes of our cluster (also no > session clustering yet). 2 remains with Jetty. Same WAR file an the same > environment. Our first test ends in an OutOfMemoryError after two days. > The java vm of the Tomcat servers has the same memory parameters as the > server with the Jetty: -Xmx512m. And no other special GC parameters. > > Apperently the Tomcat needs more memory than Jetty. > > So we are trying to give Tomcat more memory: -Xmx768m. After two days > the Tomcat is still running fine. > > Obviously Tomcat needs just a little bit more memory than Jetty. After > these two days we can state the following memory behavior. > > Node Mem used Mem reserved > 1 TC 400m 530m > 2 TC 350m 495m > 3 J 230m 350m > 4 J 290m 400m > > Averagely Tomcat is using round about 110m more memory than Jetty. But why? > > I have seen that the Tomcat DefaultServlet may cache content up to 10m > per default. But that are only 10m. > Are there some other things Tomcat may cache and Jetty does not?
There are certainly other things Tomcat caches. Whether or not Jetty caches them I couldn't say. Take some heap dumps and see what the differences are. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
