On 28/12/17 10:06, Olaf Kock wrote: > > On 27.12.2017 23:16, Eric Robinson wrote: >>> I mean A is java8 and tomcat8.. so make a C that is tomcat6 and java8 >> I don't think so. This is a requirement of the software company whose >> application solution we use. They are requiring us to move to tomcat 8 >> with jdk 1.8. If we try to mix tomcat8 with jdk 1.6, supposedly we >> would have problems. I guess all this is being driven by the need to >> switch to TLS 1.2. I'm not sure if that would be a function of tomcat >> or java. > As you were looking for the reason of the increased footprint, this > would help you tremendously to get to the root cause, even if you don't > intend to use it in production. Assume that a similar behavior already > appears when you run tomcat6 with Java8 - in this case there might be > little reason to continue to dig in tomcat, and assume that it's the > Java implementation that caused your increased footprint. > > Tomcat 8 with Java 6 won't work (apart from the outdated implementation) > as it requires at least Java7 (which is also outdated). > > And then there's yet another aspect: The memory footprint increased way > below the price decrease for memory, so just adding this much memory > could be filed away as a reasonable assumption within 7.5 years (JDK > 1.6.21 was released July 2010, I'm assuming that this is the age of the > hardware as well (because why would you have installed this version on > newer hardware, when newer releases existed) > > I'm assuming that you have enough aspects to inspect - if you're really > interested in finding the root cause, you'll need to come up with more > specific measurements, e.g. profiler data, compare thread dumps and set > up Tomcat 6 with Java 8 to have a third reference point.
I don't have Tomcat 6 to hand but I do have Tomcat 7. A quick test with Tomcat 7 + Java 6 vs Tomcat 7 + Java 8 I saw a 20% increase in memory usage. This looks very much like changes in the JVM rather than changes in Tomcat. Mark --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
