> From: Eric Robinson [mailto:eric.robin...@psmnv.com] > Subject: RE: Is it Normal for Tomcat 8 to Use 20-80% More Memory Than Tomcat 6?
> if JVM instance "A" is configured as follows on server 1 under tomcat6/jdk 1.6, then > instance "A" on server 2 is configured the same, except it is running under tomcat > 8/jdk 1.8. Yet the tomcat 8 ones used 50% more memory, on average. > JAVA_OPTS="-Xms16M -Xmx192M \ > -XX:MaxPermSize=192M \ Note that PermGen is no longer used in Java 8, and the above should log a warning: Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=192m; support was removed in 8.0 Here's a brief overview: https://blogs.oracle.com/poonam/about-g1-garbage-collector,-permanent-genera tion-and-metaspace - Chuck THIS COMMUNICATION MAY CONTAIN CONFIDENTIAL AND/OR OTHERWISE PROPRIETARY MATERIAL and is thus for use only by the intended recipient. If you received this in error, please contact the sender and delete the e-mail and its attachments from all computers.
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