> From: Martin Gainty [mailto:mgai...@hotmail.com] > Subject: RE: Redeploy leaks > > > http://community.eapps.com/showthread.php?t=153 > MG>good link to illustrate PermGen settings but including > class objects in sweep for recovering PermGen should be a > last MG>resort
Note that the above article applies only when the concurrent mark-sweep (CMS) GC algorithm is in effect, which is *not* the default. CMS can be manually enabled via the command line parameter: -XX:+UseConcMarkSweepGC or one of its aliases (-Xincgc, -Xconcgc). The CMS algorithm will also be invoked if UseAutoGCSelectPolicy is set and MaxGCPauseMillis is explicitly set to a value less than or equal to AutoGCSelectPauseMillis, whose default value is 5000 (the Java SE 6 release notes say 1 second, but the code says 5). Unless you have extremely stringent response time requirements, you probably don't want to enable CMS; it reduces throughput, and normal parallel GCs these days are usually fast enough not to create a noticeable hiccup. - 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. --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
