[jboss-user] [Performance Tuning] - Too may FullGC

Hi, I am seeing too many Full GC on our UAT jboss server Our environment detail is Jboss 4.2.0, RHEL Linux, JDK 1.5 update 12 We are using following switches with JVM | JAVA_OPTS="-server -Xms1500m -Xmx1500m -Xss128k -verbose:gc -Xloggc:GC.log -XX:+PrintGCTimeStamps -XX:+PrintGCDetails -XX:+UseLargePages -XX:PermSize=512m -XX:MaxPermSize=512m -XX:ThreadStackSize=512 -XX:+UseParallelGC -XX:+AggressiveHeap -XX:CompileThreshold=100 -XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=31" | I am not sure about all the switch since they were set by a earlier guy on the environment. It should not have that many Full GC atleast. These are the excerpts from GC.log | 3.233: [Full GC [PSYoungGen: 47467K->0K(505344K)] [PSOldGen: 0K->3913K(960512K)] 47467K->3913K(1465856K) [PSPermGen: 10353K->10353K(524288K)], 0.0826630 secs] | 20.516: [GC [PSYoungGen: 433152K->37159K(505344K)] 437065K->41073K(1465856K), 0.0479740 secs] | 26.509: [GC [PSYoungGen: 470311K->55349K(505344K)] 474225K->59263K(1465856K), 0.0718930 secs] | 63.336: [Full GC [PSYoungGen: 231313K->0K(505344K)] [PSOldGen: 3913K->70244K(960512K)] 235227K->70244K(1465856K) [PSPermGen: 60120K->60120K(524288K)], 0.6276220 secs] | 124.003: [Full GC [PSYoungGen: 12615K->0K(505344K)] [PSOldGen: 70244K->70698K(960512K)] 82860K->70698K(1465856K) [PSPermGen: 60284K->60284K(524288K)], 0.4507880 secs] | 184.480: [Full GC [PSYoungGen: 12679K->0K(505344K)] [PSOldGen: 70698K->69983K(960512K)] 83378K->69983K(1465856K) [PSPermGen: 60348K->60199K(524288K)], 0.5425070 secs] | 245.062: [Full GC [PSYoungGen: 14884K->0K(505344K)] [PSOldGen: 69983K->70499K(960512K)] 84868K->70499K(1465856K) [PSPermGen: 60240K->60240K(524288K)], 0.4373220 secs] | 305.534: [Full GC [PSYoungGen: 13311K->0K(505344K)] [PSOldGen: 70499K->70948K(960512K)] 83811K->70948K(1465856K) [PSPermGen: 60320K->60320K(524288K)], 0.4404290 secs] | 366.015: [Full GC [PSYoungGen: 19158K->0K(505344K)] [PSOldGen: 70948K->71326K(960512K)] 90107K->71326K(1465856K) [PSPermGen: 60626K->60626K(524288K)], 0.4434450 secs] | 426.492: [Full GC [PSYoungGen: 298711K->0K(505344K)] [PSOldGen: 71326K->79680K(960512K)] 370038K->79680K(1465856K) [PSPermGen: 63711K->63704K(524288K)], 0.6969270 secs] | 487.235: [Full GC [PSYoungGen: 113471K->0K(505344K)] [PSOldGen: 79680K->81257K(960512K)] 193152K->81257K(1465856K) [PSPermGen: 64029K->64029K(524288K)], 0.5384320 secs] | 547.798: [Full GC [PSYoungGen: 50512K->0K(505344K)] [PSOldGen: 81257K->82307K(960512K)] 131769K->82307K(1465856K) [PSPermGen: 64102K->64102K(524288K)], 0.5207440 secs] | 608.354: [Full GC [PSYoungGen: 20435K->0K(505344K)] [PSOldGen: 82307K->82894K(960512K)] 102743K->82894K(1465856K) [PSPermGen: 64113K->64113K(524288K)], 0.5209310 secs] | 668.918: [Full GC [PSYoungGen: 20048K->0K(505344K)] [PSOldGen: 82894K->81159K(960512K)] 102943K->81159K(1465856K) [PSPermGen: 64119K->64116K(524288K)], 0.5797770 secs] | 729.540: [Full GC [PSYoungGen: 18845K->0K(505344K)] [PSOldGen: 81159K->81862K(960512K)] 100005K->81862K(1465856K) [PSPermGen: 64123K->64123K(524288K)], 0.5061830 secs] | 790.082: [Full GC [PSYoungGen: 17355K->0K(505344K)] [PSOldGen: 81862K->82468K(960512K)] 99218K->82468K(1465856K) [PSPermGen: 64157K->64157K(524288K)], 0.5156910 secs] | 850.640: [Full GC [PSYoungGen: 21532K->0K(505344K)] [PSOldGen: 82468K->82883K(960512K)] 104001K->82883K(1465856K) [PSPermGen: 64166K->64166K(524288K)], 0.5069440 secs] | 911.190: [Full GC [PSYoungGen: 39172K->0K(505344K)] [PSOldGen: 82883K->82313K(960512K)] 122056K->82313K(1465856K) [PSPermGen: 64416K->64415K(524288K)], 0.5833240 secs] | 971.798: [Full GC [PSYoungGen: 42793K->0K(505344K)] [PSOldGen: 82313K->83650K(960512K)] 125106K->83650K(1465856K) [PSPermGen: 65044K->65044K(524288K)], 0.5328580 secs] | 1032.366: [Full GC [PSYoungGen: 79362K->0K(505344K)] [PSOldGen: 83650K->85485K(960512K)] 163013K->85485K(1465856K) [PSPermGen: 65067K->65067K(524288K)], 0.5602910 secs] | 1092.971: [Full GC [PSYoungGen: 19971K->0K(505344K)] [PSOldGen: 85485K->85872K(960512K)] 105457K->85872K(1465856K) [PSPermGen: 65071K->65071K(524288K)], 0.5192250 secs] | 1153.514: [Full GC [PSYoungGen: 41284K->0K(505344K)] [PSOldGen: 85872K->84748K(960512K)] 127156K->84748K(1465856K) [PSPermGen: 65145K->65143K(524288K)], 0.5955200 secs] | 1214.134: [Full GC [PSYoungGen: 26565K->0K(505344K)] [PSOldGen: 84748K->85414K(960512K)] 111314K->85414K(1465856K) [PSPermGen: 65267K->65267K(524288K)], 0.5293840 secs] | 1274.699: [Full GC [PSYoungGen: 19038K->0K(505344K)] [PSOldGen: 85414K->85902K(960512K)] 104453K->85902K(1465856K) [PSPermGen: 65275K->65275K(524288K)], 0.5349830 secs] | 1335.259: [Full GC [PSYoungGen: 28956K->0K(505344K)] [PSOldGen: 85902K->86588K(960512K)] 114859K->86588K(1465856K) [PSPermGen: 65287K->65287K(524288K)], 0.5304630 secs] | 1395.814: [Full GC [PSYoungGen: 58454K->0K(505344K)] [PSOldGen: 86588K->90846K(960512K)] 145043K->90846K(1465856K) [PSPermGen: 65489K->65485K(524288K)], 0.6308820 secs] | 1456.490: [Full GC [PSYoungGen: 17463K->0K(505344K)] [PSOldGen: 90846K->91146K(960512K)] 108310K->91146K(1465856K) [PSPermGen: 65489K->65489K(524288K)], 0.5279640 secs] | 1517.053: [Full GC [PSYoungGen: 21551K->0K(505344K)] [PSOldGen: 91146K->88091K(960512K)] 112697K->88091K(1465856K) [PSPermGen: 65490K->65490K(524288K)], 0.6676840 secs] | 1577.765: [Full GC [PSYoungGen: 17617K->0K(505344K)] [PSOldGen: 88091K->88316K(960512K)] 105709K->88316K(1465856K) [PSPermGen: 65490K->65490K(524288K)], 0.5269980 secs] | 1638.317: [Full GC [PSYoungGen: 16328K->0K(505344K)] [PSOldGen: 88316K->82510K(960512K)] 104644K->82510K(1465856K) [PSPermGen: 65495K->65068K(524288K)], 0.6246950 secs] | 1698.977: [Full GC [PSYoungGen: 18979K->0K(505344K)] [PSOldGen: 82510K->82693K(960512K)] 101489K->82693K(1465856K) [PSPermGen: 65071K->65071K(524288K)], 0.5276440 secs] | 1759.549: [Full GC [PSYoungGen: 20763K->0K(505344K)] [PSOldGen: 82693K->83137K(960512K)] 103456K->83137K(1465856K) [PSPermGen: 65086K->65086K(524288K)], 0.5161060 secs] | 1820.111: [Full GC [PSYoungGen: 150814K->0K(505344K)] [PSOldGen: 83137K->84225K(960512K)] 233951K->84225K(1465856K) [PSPermGen: 65134K->65134K(524288K)], 0.6056400 secs] | 1836.570: [GC [PSYoungGen: 433152K->11264K(505344K)] 517377K->95489K(1465856K), 0.0111670 secs] | 1880.761: [Full GC [PSYoungGen: 115732K->0K(505344K)] [PSOldGen: 84225K->87439K(960512K)] 199957K->87439K(1465856K) [PSPermGen: 65349K->65279K(524288K)], 0.7114030 secs] | 1941.509: [Full GC [PSYoungGen: 430910K->0K(505344K)] [PSOldGen: 87439K->89011K(960512K)] 518349K->89011K(1465856K) [PSPermGen: 65306K->65306K(524288K)], 0.6858490 secs] | 2002.221: [Full GC [PSYoungGen: 109493K->0K(505344K)] [PSOldGen: 89011K->90356K(960512K)] 198505K->90356K(1465856K) [PSPermGen: 65546K->65546K(524288K)], 0.6933410 secs] | 2062.957: [Full GC [PSYoungGen: 27659K->0K(505344K)] [PSOldGen: 90356K->90880K(960512K)] 118015K->90880K(1465856K) [PSPermGen: 65549K->65549K(524288K)], 0.5455710 secs] | 2123.529: [Full GC [PSYoungGen: 42855K->0K(505344K)] [PSOldGen: 90880K->88179K(960512K)] 133736K->88179K(1465856K) [PSPermGen: 65550K->65526K(524288K)], 0.6687030 secs] | 2184.244: [Full GC [PSYoungGen: 414946K->0K(505344K)] [PSOldGen: 88179K->89130K(960512K)] 503125K->89130K(1465856K) [PSPermGen: 65526K->65526K(524288K)], 0.6813070 secs] | 2244.950: [Full GC [PSYoungGen: 18271K->0K(505344K)] [PSOldGen: 89130K->89556K(960512K)] 107401K->89556K(1465856K) [PSPermGen: 65527K->65527K(524288K)], 0.5417160 secs] | 2305.538: [Full GC [PSYoungGen: 23252K->0K(505344K)] [PSOldGen: 89556K->92276K(960512K)] 112809K->92276K(1465856K) [PSPermGen: 65527K->65527K(524288K)], 0.5528190 secs | | Please advise on the same View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4233747#... 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