This has been discussed quite a lot on mailing list. Lots of things can generate memory leaks in webapp environment. Amongst others: - not nullifying threadlocal variable. - use of singleton pattern - some bugged versions of CGlib
take a look at older messages in this mailing list http://marc.theaimsgroup.com/?l=tomcat-user&w=2&r=1&s=permgen&q=b Darren Kukulka a écrit : > Hi All, > > > > Throughput Garbage collection on a 5.5.15 Tomcat instance is failing to > release Old Gen heap space when it becomes full on one of our Windows > installations. > > > > For the most part GC does release memory - in a typical working day this is > an upward trend in terms of the amount of heap reclaimed, gradually becoming > a downward trend late in the day. > > > > Every now and then JConsole shows Old Gen as having flat-lined. Only a > Tomcat restart can rectify the problem. Killing sessions followed by a > manual GC does not seem to have an effect. > > > > Haven't yet determined whether we need to start looking at the young to old > heap allocation ratios - is this the main area I should be looking into? > > > > Any thoughts would be appreciated. > > > > Cheers, > > Darren Kukulka > > > > > > Connaught honoured AIM 'Decade of Excellence' Award > > > > Connaught awarded Partnering Contractor of the Year 2005 > > > > Connaught wins AIM 'Company of the Year' award 2004 > > > > West of England Business of the Year Award Winner 2003 > > > > Why not visit our website http://www.connaught.plc.uk > > > > Disclaimer: > > The information transmitted is intended only for the person or entity to > which it is addressed and may contain confidential and/or privileged > material. Any review, retransmission, dissemination or other use of, or > taking of any action in reliance upon, this information by persons or > entities other than the intended recipient is prohibited. If you received > this in error, please contact the sender and delete this message. > > > > Connaught plc, Head Office 01392 444546 > > --------------------------------------------------------------------- To start a new topic, e-mail: users@tomcat.apache.org To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
