Full GC happening frequently in Wildfly 8.2.0.Final --------------------------------------------------- Key: WFLY-4591 URL: https://issues.jboss.org/browse/WFLY-4591 Project: WildFly Issue Type: Bug Affects Versions: 8.2.0.Final Environment: CentOS release 6.5 (Final), java version "1.7.0_71" 64 bit VM, Wildfly 8.2.0.Final, Min heap and Max heap 1536m Reporter: Srivathsan Agaram Venkatavaradhan Assignee: Jason Greene Labels: wildfly We upgraded from Jboss 7.1.1.Final to Wildfly 8.2.0.Final. After the upgrade we are seeing full frequent garbage collection (happening every 2 mins) during load test. This was not the case in Jboss 7.1.1.Final. Our heap dumps suggested that too many garbage is getting created (Around 800 MB) and getting cleaned up in full GC. Due to this CPU consumption increase by 20%.. We don't have any clue what is inside 800 MB (as it is garbage). We have not tuned wildfly as such and use its defaults . We use parallel GC. Full GC traces 2015-05-05 16:15:54 IST| 2773.194: [Full GC [PSYoungGen: 7934K->0K(514560K)] [ParOldGen: 1045554K->459984K(1048576K)] 1053489K->459984K(1563136K) [PSPermGen: 216983K->216983K(321024K)], 0.8232410 secs] [Times: user=3.90 sys=0.00, real=0.82 secs] 2015-05-05 16:18:58 IST| 2957.412: [Full GC [PSYoungGen: 7116K->0K(513536K)] [ParOldGen: 1047424K->469811K(1048576K)] 1054540K->469811K(1562112K) [PSPermGen: 216993K->216993K(306688K)], 0.8385900 secs] [Times: user=3.90 sys=0.01, real=0.84 secs] 2015-05-05 16:21:58 IST| 3136.966: [Full GC [PSYoungGen: 6412K->0K(512000K)] [ParOldGen: 1041262K->477443K(1048576K)] 1047674K->477443K(1560576K) [PSPermGen: 217024K->217021K(293376K)], 0.8964940 secs] [Times: user=4.21 sys=0.01, real=0.90 secs] 2015-05-05 16:25:02 IST| 3320.672: [Full GC [PSYoungGen: 6789K->0K(514048K)] [ParOldGen: 1043283K->470768K(1048576K)] 1050072K->470768K(1562624K) [PSPermGen: 217028K->217028K(282112K)], 0.9000050 secs] [Times: user=4.31 sys=0.01, real=0.90 secs] We have also set explicit GC to happen evey 10 mins. This worked fine in 7.1.1.Final where gc only happened every 10 mins.