I have a JVM heap monitor that sends emails when the upper limit changes, and this appears to be true. The GC still works, that is, used heap continues to fluctuate up and down within the current upper limit, but if the server experiences a hit on load and increases the heap, it remains at that level.
I have not yet seen it release heap, however, our servers have never grown beyond about 15% of max memory available. I wonder if when it starts bouncing around 90%-95%, will it start to release heap. -----Original Message----- From: Robinson, Eric [mailto:eric.robin...@psmnv.com] Sent: Tuesday, February 08, 2011 10:27 AM To: Tomcat Users List Subject: Is IBM Right About Java? Saw this statement on an IBM web site: "Most JVMs grow towards the upper heap limit (-Xmx/-mx options) when more memory is required, and do not return memory to the operating system, even if the memory is no longer needed, until the JVM process terminates." Is this true? If thought returning unneeded memory to the OS was what GC is all about. -- Eric Robinson Disclaimer - February 8, 2011 This email and any files transmitted with it are confidential and intended solely for Tomcat Users List. If you are not the named addressee you should not disseminate, distribute, copy or alter this email. Any views or opinions presented in this email are solely those of the author and might not represent those of Physicians' Managed Care or Physician Select Management. Warning: Although Physicians' Managed Care or Physician Select Management has taken reasonable precautions to ensure no viruses are present in this email, the company cannot accept responsibility for any loss or damage arising from the use of this email or attachments. This disclaimer was added by Policy Patrol: http://www.policypatrol.com/ --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
