CPU differences and CMS GC performance

craig yeldell ycraig at cysystems.com
Wed Jan 5 16:37:50 UTC 2011


I have a production environment that consists of two different  
hardware configurations.  We have just replaced half our environment  
with new  servers that have more RAM and different CPU's.  We left the  
GC params the same,  the GC behavior has been quite surprising.  I  
expected to see faster collections on the New and CMS due to the raw  
cpu test results of the Nehalem, and this held true.  However I also  
found fewer New collections, and increased CMS collections.
In a nutshell, I assumed upgrading the CPU alone without touching the  
GC args would result in improved GC performance.


Java info:

Java(TM) SE Runtime Environment (build 1.6.0_20-b02)
Java HotSpot(TM) 64-Bit Server VM (build 16.3-b01, mixed mode)

-server -Xmx2500m -Xms2500m -Dsun.rmi.dgc.client.gcInterval=3600000 - 
Dsun.rmi.dgc.server.gcInterval=3600000 -Xss256k -XX:+DisableExplicitGC  
-XX:PermSize=384m -XX:MaxPermSize=384m -XX:MaxNewSize=888m - 
XX:NewSize=888m -XX:ParallelGCThreads=6 -verbose:gc -Xloggc:vm01.gc - 
XX:+PrintGCDetails -XX:+PrintGCDateStamps -XX: 
+HeapDumpOnOutOfMemoryError -XX:+UseConcMarkSweepGC -XX: 
+CMSClassUnloadingEnabled -XX:SurvivorRatio=4 -XX:+UseTLAB -XX: 
+UseParNewGC -XX:+UseBiasedLocking -XX:TargetSurvivorRatio=75 -XX: 
+UseCMSInitiatingOccupancyOnly -XX:CMSInitiatingOccupancyFraction=80

NOTE: Each server has 4 jvm's running and all vm's in the environment  
are equally load balanced.

CPU info:

OLD
16GB

CPU frequency:    3.003 GHz (Xeon)
Number of CPUs: 4
Number of cores: 8
Number of threads: 16


NEW
32GB

CPU frequency:    2.533 GHz (Xeon E5540 Nehalem)
Number of CPUs: 2
Number of cores: 8
Number of threads: 16


Example GC snippet:

Old server:

2011-01-04T18:24:02.073-0500: 316390.125: [CMS-concurrent-reset:  
0.061/0.061 secs] [Times: user=0.06 sys=0.00, real=0.06 secs]
2011-01-04T18:24:12.890-0500: 316400.941: [GC 316400.942: [ParNew:  
690252K->93718K(757760K), 0.1300730 secs] 1968696K->1372788K 
(2408448K), 0.1308690 secs] [Times: user=0.66 sys=0.00, real=0.13 secs]
2011-01-04T18:24:50.647-0500: 316438.698: [GC 316438.699: [ParNew:  
699926K->74785K(757760K), 0.1296920 secs] 1978996K->1355277K 
(2408448K), 0.1304530 secs] [Times: user=0.61 sys=0.00, real=0.13 secs]
2011-01-04T18:25:17.854-0500: 316465.905: [GC 316465.906: [ParNew:  
680928K->86498K(757760K), 0.1505500 secs] 1961420K->1369830K 
(2408448K), 0.1513450 secs] [Times: user=0.71 sys=0.00, real=0.15 secs]
2011-01-04T18:25:50.762-0500: 316498.814: [GC 316498.814: [ParNew:  
692706K->69120K(757760K), 0.1385690 secs] 1976038K->1352581K 
(2408448K), 0.1393620 secs] [Times: user=0.63 sys=0.00, real=0.14 secs]
2011-01-04T18:26:22.644-0500: 316530.695: [GC 316530.696: [ParNew:  
675328K->86476K(757760K), 0.1493580 secs] 1958789K->1372863K 
(2408448K), 0.1501220 secs] [Times: user=0.66 sys=0.00, real=0.15 secs]
2011-01-04T18:27:01.951-0500: 316570.003: [GC 316570.003: [ParNew:  
692684K->70259K(757760K), 0.1250090 secs] 1979071K->1357514K 
(2408448K), 0.1257610 secs] [Times: user=0.62 sys=0.00, real=0.13 secs]
2011-01-04T18:27:28.542-0500: 316596.594: [GC 316596.594: [ParNew:  
676467K->88180K(757760K), 0.1030450 secs] 1963722K->1375664K 
(2408448K), 0.1038090 secs] [Times: user=0.54 sys=0.00, real=0.10 secs]
2011-01-04T18:27:52.200-0500: 316620.251: [GC 316620.252: [ParNew:  
694388K->64015K(757760K), 0.1551250 secs] 1981872K->1351774K 
(2408448K), 0.1560860 secs] [Times: user=0.79 sys=0.00, real=0.15 secs]
2011-01-04T18:28:07.789-0500: 316635.841: [GC 316635.841: [ParNew:  
670223K->94609K(757760K), 0.1321720 secs] 1957982K->1385077K 
(2408448K), 0.1329350 secs] [Times: user=0.65 sys=0.01, real=0.13 secs]
2011-01-04T18:28:38.020-0500: 316666.071: [GC 316666.072: [ParNew:  
700817K->64339K(757760K), 0.1169430 secs] 1991285K->1358764K 
(2408448K), 0.1177070 secs] [Times: user=0.59 sys=0.00, real=0.12 secs]
2011-01-04T18:29:13.319-0500: 316701.370: [GC 316701.371: [ParNew:  
670547K->75587K(757760K), 0.1352400 secs] 1964972K->1370278K 
(2408448K), 0.1360140 secs] [Times: user=0.63 sys=0.00, real=0.13 secs]
2011-01-04T18:29:46.586-0500: 316734.637: [GC 316734.638: [ParNew:  
681795K->67573K(757760K), 0.1257050 secs] 1976486K->1364337K 
(2408448K), 0.1265250 secs] [Times: user=0.56 sys=0.01, real=0.12 secs]
2011-01-04T18:30:31.525-0500: 316779.577: [GC 316779.578: [ParNew:  
673781K->65516K(757760K), 0.1143930 secs] 1970545K->1363488K 
(2408448K), 0.1154980 secs] [Times: user=0.54 sys=0.00, real=0.12 secs]
2011-01-04T18:30:56.159-0500: 316804.211: [GC 316804.211: [ParNew:  
671724K->54331K(757760K), 0.1067750 secs] 1969696K->1353537K 
(2408448K), 0.1075690 secs] [Times: user=0.53 sys=0.00, real=0.11 secs]
2011-01-04T18:32:01.256-0500: 316869.308: [GC 316869.308: [ParNew:  
660539K->66703K(757760K), 0.1036880 secs] 1959745K->1367053K 
(2408448K), 0.1044590 secs] [Times: user=0.49 sys=0.00, real=0.11 secs]
2011-01-04T18:32:31.967-0500: 316900.019: [GC 316900.019: [ParNew:  
672911K->54742K(757760K), 0.1121020 secs] 1973261K->1355232K 
(2408448K), 0.1128580 secs] [Times: user=0.51 sys=0.00, real=0.11 secs]
2011-01-04T18:33:05.187-0500: 316933.239: [GC 316933.239: [ParNew:  
660950K->66592K(757760K), 0.0990360 secs] 1961440K->1368889K 
(2408448K), 0.0998210 secs] [Times: user=0.49 sys=0.00, real=0.10 secs]
2011-01-04T18:33:38.693-0500: 316966.745: [GC 316966.745: [ParNew:  
672800K->57860K(757760K), 0.1132210 secs] 1975097K->1361914K 
(2408448K), 0.1139990 secs] [Times: user=0.53 sys=0.01, real=0.12 secs]
2011-01-04T18:34:33.087-0500: 317021.139: [GC 317021.139: [ParNew:  
664068K->74055K(757760K), 0.1268070 secs] 1968122K->1379190K 
(2408448K), 0.1275670 secs] [Times: user=0.52 sys=0.00, real=0.12 secs]
2011-01-04T18:34:59.371-0500: 317047.423: [GC 317047.423: [ParNew:  
680263K->67454K(757760K), 0.1354760 secs] 1985398K->1374886K 
(2408448K), 0.1363060 secs] [Times: user=0.61 sys=0.01, real=0.14 secs]
2011-01-04T18:35:23.757-0500: 317071.809: [GC 317071.809: [ParNew:  
673662K->78394K(757760K), 0.1624010 secs] 1981094K->1385967K 
(2408448K), 0.1632150 secs] [Times: user=0.78 sys=0.00, real=0.17 secs]
2011-01-04T18:35:45.117-0500: 317093.169: [GC 317093.169: [ParNew:  
684602K->66073K(757760K), 0.1161380 secs] 1992175K->1373969K 
(2408448K), 0.1170380 secs] [Times: user=0.60 sys=0.00, real=0.12 secs]
2011-01-04T18:36:29.794-0500: 317137.845: [GC 317137.846: [ParNew:  
672281K->97964K(757760K), 0.1333770 secs] 1980177K->1406249K 
(2408448K), 0.1341740 secs] [Times: user=0.68 sys=0.00, real=0.13 secs]
2011-01-04T18:36:58.710-0500: 317166.762: [GC 317166.762: [ParNew:  
704172K->76194K(757760K), 0.1261530 secs] 2012457K->1385682K 
(2408448K), 0.1269720 secs] [Times: user=0.64 sys=0.00, real=0.12 secs]
2011-01-04T18:37:27.242-0500: 317195.294: [GC 317195.294: [ParNew:  
682402K->88786K(757760K), 0.1270880 secs] 1991890K->1399799K 
(2408448K), 0.1278570 secs] [Times: user=0.63 sys=0.00, real=0.13 secs]
2011-01-04T18:38:06.888-0500: 317234.940: [GC 317234.940: [ParNew:  
694994K->71919K(757760K), 0.1298460 secs] 2006007K->1385713K 
(2408448K), 0.1305940 secs] [Times: user=0.63 sys=0.00, real=0.13 secs]
2011-01-04T18:38:27.888-0500: 317255.940: [GC 317255.941: [ParNew:  
678127K->94010K(757760K), 0.1288970 secs] 1991921K->1410066K 
(2408448K), 0.1296270 secs] [Times: user=0.67 sys=0.00, real=0.13 secs]
2011-01-04T18:38:58.904-0500: 317286.956: [GC 317286.957: [ParNew:  
700218K->71826K(757760K), 0.1199630 secs] 2016274K->1389379K 
(2408448K), 0.1207380 secs] [Times: user=0.63 sys=0.01, real=0.12 secs]
2011-01-04T18:39:21.896-0500: 317309.947: [GC 317309.948: [ParNew:  
678034K->89229K(757760K), 0.1211860 secs] 1995587K->1407260K 
(2408448K), 0.1219360 secs] [Times: user=0.62 sys=0.00, real=0.12 secs]
2011-01-04T18:39:53.845-0500: 317341.897: [GC 317341.897: [ParNew:  
695437K->76437K(757760K), 0.1253990 secs] 2013468K->1396004K 
(2408448K), 0.1261630 secs] [Times: user=0.67 sys=0.00, real=0.13 secs]
2011-01-04T18:40:18.938-0500: 317366.990: [GC 317366.990: [ParNew:  
682645K->91160K(757760K), 0.1523130 secs] 2002212K->1410757K 
(2408448K), 0.1531110 secs] [Times: user=0.83 sys=0.01, real=0.15 secs]
2011-01-04T18:40:42.708-0500: 317390.760: [GC 317390.760: [ParNew:  
697002K->87022K(757760K), 0.1530570 secs] 2016600K->1408083K 
(2408448K), 0.1538470 secs] [Times: user=0.71 sys=0.01, real=0.16 secs]
2011-01-04T18:40:42.867-0500: 317390.919: [GC [1 CMS-initial-mark:  
1321060K(1650688K)] 1408857K(2408448K), 0.2067320 secs] [Times:  
user=0.21 sys=0.00, real=0.21 secs]
2011-01-04T18:40:43.075-0500: 317391.126: [CMS-concurrent-mark-start]
2011-01-04T18:40:47.573-0500: 317395.625: [CMS-concurrent-mark:  
4.486/4.499 secs] [Times: user=12.20 sys=0.13, real=4.50 secs]
2011-01-04T18:40:47.574-0500: 317395.625: [CMS-concurrent-preclean- 
start]
2011-01-04T18:40:47.636-0500: 317395.688: [CMS-concurrent-preclean:  
0.059/0.063 secs] [Times: user=0.06 sys=0.00, real=0.06 secs]
2011-01-04T18:40:47.637-0500: 317395.688: [CMS-concurrent-abortable- 
preclean-start]
  CMS: abort preclean due to time 2011-01-04T18:40:52.701-0500:  
317400.753: [CMS-concurrent-abortable-preclean: 4.139/5.065 secs]  
[Times: user=5.46 sys=0.05, real=5.07 secs]
2011-01-04T18:40:52.707-0500: 317400.758: [GC[YG occupancy: 432613 K  
(757760 K)]317400.759: [Rescan (parallel) , 0.9054620 secs]317401.664:  
[weak refs processing, 0.0017920 secs]317401.666: [class unloading,  
0.1888550 secs]317401.855: [scrub symbol & string tables, 0.1271210  
secs] [1 CMS-remark: 1321060K(1650688K)] 1753674K(2408448K), 1.2454560  
secs] [Times: user=5.33 sys=0.02, real=1.25 secs]
2011-01-04T18:40:53.953-0500: 317402.005: [CMS-concurrent-sweep-start]
2011-01-04T18:40:57.534-0500: 317405.586: [CMS-concurrent-sweep:  
3.565/3.581 secs] [Times: user=4.90 sys=0.07, real=3.58 secs]
2011-01-04T18:40:57.535-0500: 317405.586: [CMS-concurrent-reset-start]
2011-01-04T18:40:57.595-0500: 317405.646: [CMS-concurrent-reset:  
0.060/0.060 secs] [Times: user=0.06 sys=0.00, real=0.06 secs]

New Server

2011-01-04T18:33:40.473-0500: 223993.306: [CMS-concurrent-reset:  
0.004/0.004 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
2011-01-04T18:33:54.357-0500: 224007.190: [GC 224007.190: [ParNew:  
719918K->130085K(757760K), 0.0754960 secs] 2004520K->1415071K 
(2408448K), 0.0758300 secs] [Times: user=0.42 sys=0.00, real=0.07 secs]
2011-01-04T18:34:47.106-0500: 224059.939: [GC 224059.939: [ParNew:  
736293K->107200K(757760K), 0.0819180 secs] 2021279K->1393051K 
(2408448K), 0.0822590 secs] [Times: user=0.45 sys=0.00, real=0.08 secs]
2011-01-04T18:35:07.057-0500: 224079.891: [GC 224079.891: [ParNew:  
713408K->134972K(757760K), 0.0886030 secs] 1999259K->1421467K 
(2408448K), 0.0889400 secs] [Times: user=0.42 sys=0.00, real=0.09 secs]
2011-01-04T18:35:41.454-0500: 224114.287: [GC 224114.288: [ParNew:  
741180K->117493K(757760K), 0.0785680 secs] 2027675K->1404100K 
(2408448K), 0.0789010 secs] [Times: user=0.44 sys=0.00, real=0.08 secs]
2011-01-04T18:36:07.806-0500: 224140.640: [GC 224140.640: [ParNew:  
723701K->139373K(757760K), 0.0919290 secs] 2010308K->1426255K 
(2408448K), 0.0922630 secs] [Times: user=0.49 sys=0.00, real=0.10 secs]
2011-01-04T18:36:40.539-0500: 224173.372: [GC 224173.372: [ParNew:  
745581K->118113K(757760K), 0.0912580 secs] 2032463K->1405613K 
(2408448K), 0.0916060 secs] [Times: user=0.49 sys=0.00, real=0.09 secs]
2011-01-04T18:37:02.915-0500: 224195.748: [GC 224195.748: [ParNew:  
724321K->145077K(757760K), 0.0928130 secs] 2011821K->1434160K 
(2408448K), 0.0931450 secs] [Times: user=0.48 sys=0.00, real=0.09 secs]
2011-01-04T18:37:22.451-0500: 224215.284: [GC 224215.284: [ParNew:  
751285K->107168K(757760K), 0.0779940 secs] 2040368K->1399901K 
(2408448K), 0.0783240 secs] [Times: user=0.40 sys=0.00, real=0.08 secs]
2011-01-04T18:37:53.390-0500: 224246.223: [GC 224246.223: [ParNew:  
713376K->123307K(757760K), 0.0920660 secs] 2006109K->1418928K 
(2408448K), 0.0924470 secs] [Times: user=0.45 sys=0.00, real=0.10 secs]
2011-01-04T18:38:16.100-0500: 224268.934: [GC 224268.934: [ParNew:  
729515K->105143K(757760K), 0.0863940 secs] 2025136K->1402705K 
(2408448K), 0.0867110 secs] [Times: user=0.43 sys=0.00, real=0.09 secs]
2011-01-04T18:38:30.499-0500: 224283.332: [GC 224283.333: [ParNew:  
711351K->127726K(757760K), 0.0918920 secs] 2008913K->1426844K 
(2408448K), 0.0922350 secs] [Times: user=0.48 sys=0.00, real=0.09 secs]
2011-01-04T18:39:09.092-0500: 224321.925: [GC 224321.926: [ParNew:  
733934K->106828K(757760K), 0.0962380 secs] 2033052K->1408490K 
(2408448K), 0.0965730 secs] [Times: user=0.51 sys=0.00, real=0.10 secs]
2011-01-04T18:39:36.359-0500: 224349.192: [GC 224349.192: [ParNew:  
713036K->110615K(757760K), 0.0924370 secs] 2014698K->1413885K 
(2408448K), 0.0927620 secs] [Times: user=0.49 sys=0.00, real=0.09 secs]
2011-01-04T18:39:41.489-0500: 224354.322: [GC 224354.322: [ParNew:  
716823K->130526K(757760K), 0.1148370 secs] 2020093K->1435557K 
(2408448K), 0.1152070 secs] [Times: user=0.51 sys=0.00, real=0.11 secs]
2011-01-04T18:39:58.265-0500: 224371.099: [GC 224371.099: [ParNew:  
736734K->112410K(757760K), 0.1139600 secs] 2041765K->1421693K 
(2408448K), 0.1143070 secs] [Times: user=0.59 sys=0.00, real=0.11 secs]
2011-01-04T18:40:22.876-0500: 224395.709: [GC 224395.709: [ParNew:  
718618K->151551K(757760K), 0.1168680 secs] 2027901K->1464667K 
(2408448K), 0.1172010 secs] [Times: user=0.58 sys=0.00, real=0.12 secs]
2011-01-04T18:40:41.288-0500: 224414.121: [GC 224414.121: [ParNew:  
757759K->131092K(757760K), 0.1072970 secs] 2070875K->1445457K 
(2408448K), 0.1076500 secs] [Times: user=0.61 sys=0.00, real=0.11 secs]
2011-01-04T18:41:06.756-0500: 224439.589: [GC 224439.590: [ParNew:  
737300K->151552K(757760K), 0.1244220 secs] 2051665K->1476639K 
(2408448K), 0.1247530 secs] [Times: user=0.59 sys=0.00, real=0.13 secs]
2011-01-04T18:41:06.882-0500: 224439.715: [GC [1 CMS-initial-mark:  
1325087K(1650688K)] 1477191K(2408448K), 0.1086530 secs] [Times:  
user=0.10 sys=0.00, real=0.10 secs]
2011-01-04T18:41:06.991-0500: 224439.824: [CMS-concurrent-mark-start]
2011-01-04T18:41:08.521-0500: 224441.354: [CMS-concurrent-mark:  
1.529/1.529 secs] [Times: user=3.31 sys=0.02, real=1.54 secs]
2011-01-04T18:41:08.521-0500: 224441.354: [CMS-concurrent-preclean- 
start]
2011-01-04T18:41:08.535-0500: 224441.368: [CMS-concurrent-preclean:  
0.014/0.014 secs] [Times: user=0.01 sys=0.00, real=0.01 secs]
2011-01-04T18:41:08.535-0500: 224441.368: [CMS-concurrent-abortable- 
preclean-start]
  CMS: abort preclean due to time 2011-01-04T18:41:13.646-0500:  
224446.479: [CMS-concurrent-abortable-preclean: 3.679/5.111 secs]  
[Times: user=3.99 sys=0.03, real=5.11 secs]
2011-01-04T18:41:13.648-0500: 224446.482: [GC[YG occupancy: 220397 K  
(757760 K)]224446.482: [Rescan (parallel) , 0.0440200 secs]224446.526:  
[weak refs processing, 0.0059890 secs]224446.532: [class unloading,  
0.1417810 secs]224446.674: [scrub symbol & string tables, 0.0489470  
secs] [1 CMS-remark: 1325087K(1650688K)] 1545485K(2408448K), 0.2519760  
secs] [Times: user=0.44 sys=0.01, real=0.25 secs]
2011-01-04T18:41:13.901-0500: 224446.734: [CMS-concurrent-sweep-start]
2011-01-04T18:41:14.791-0500: 224447.624: [CMS-concurrent-sweep:  
0.888/0.890 secs] [Times: user=0.91 sys=0.01, real=0.88 secs]
2011-01-04T18:41:14.791-0500: 224447.624: [CMS-concurrent-reset-start]
2011-01-04T18:41:14.795-0500: 224447.628: [CMS-concurrent-reset:  
0.004/0.004 secs] [Times: user=0.01 sys=0.00, real=0.01 secs]
2011-01-04T18:41:40.336-0500: 224473.169: [GC 224473.170: [ParNew:  
757760K->151551K(757760K), 0.1246970 secs] 2061601K->1458549K 
(2408448K), 0.1250470 secs] [Times: user=0.67 sys=0.00, real=0.13 secs]
2011-01-04T18:42:15.493-0500: 224508.327: [GC 224508.327: [ParNew:  
757759K->151552K(757760K), 0.1264960 secs] 2064757K->1468487K 
(2408448K), 0.1269000 secs] [Times: user=0.58 sys=0.00, real=0.13 secs]
2011-01-04T18:42:30.747-0500: 224523.580: [GC 224523.580: [ParNew:  
757760K->150109K(757760K), 0.1121970 secs] 2074695K->1469299K 
(2408448K), 0.1126290 secs] [Times: user=0.56 sys=0.00, real=0.12 secs]
2011-01-04T18:43:00.779-0500: 224553.612: [GC 224553.612: [ParNew:  
756317K->151552K(757760K), 0.1331190 secs] 2075507K->1479534K 
(2408448K), 0.1334580 secs] [Times: user=0.61 sys=0.00, real=0.13 secs]
2011-01-04T18:43:00.914-0500: 224553.748: [GC [1 CMS-initial-mark:  
1327982K(1650688K)] 1479538K(2408448K), 0.1464550 secs] [Times:  
user=0.15 sys=0.00, real=0.15 secs]
2011-01-04T18:43:01.061-0500: 224553.894: [CMS-concurrent-mark-start]
2011-01-04T18:43:02.661-0500: 224555.494: [CMS-concurrent-mark:  
1.583/1.600 secs] [Times: user=3.70 sys=0.04, real=1.60 secs]
2011-01-04T18:43:02.661-0500: 224555.494: [CMS-concurrent-preclean- 
start]
2011-01-04T18:43:02.675-0500: 224555.509: [CMS-concurrent-preclean:  
0.014/0.014 secs] [Times: user=0.01 sys=0.00, real=0.01 secs]
2011-01-04T18:43:02.676-0500: 224555.509: [CMS-concurrent-abortable- 
preclean-start]
  CMS: abort preclean due to time 2011-01-04T18:43:07.909-0500:  
224560.742: [CMS-concurrent-abortable-preclean: 3.899/5.234 secs]  
[Times: user=4.31 sys=0.08, real=5.24 secs]
2011-01-04T18:43:07.912-0500: 224560.745: [GC[YG occupancy: 289988 K  
(757760 K)]224560.745: [Rescan (parallel) , 0.1425160 secs]224560.888:  
[weak refs processing, 0.0000900 secs]224560.888: [class unloading,  
0.1369840 secs]224561.025: [scrub symbol & string tables, 0.0474080  
secs] [1 CMS-remark: 1327982K(1650688K)] 1617971K(2408448K), 0.3377450  
secs] [Times: user=0.75 sys=0.00, real=0.34 secs]
2011-01-04T18:43:08.250-0500: 224561.083: [CMS-concurrent-sweep-start]
2011-01-04T18:43:09.138-0500: 224561.971: [CMS-concurrent-sweep:  
0.888/0.888 secs] [Times: user=0.90 sys=0.01, real=0.89 secs]
2011-01-04T18:43:09.138-0500: 224561.972: [CMS-concurrent-reset-start]
2011-01-04T18:43:09.142-0500: 224561.976: [CMS-concurrent-reset:  
0.004/0.004 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
2011-01-04T18:43:21.068-0500: 224573.902: [GC 224573.902: [ParNew:  
757360K->151551K(757760K), 0.1132670 secs] 2060610K->1458489K 
(2408448K), 0.1135890 secs] [Times: user=0.59 sys=0.00, real=0.11 secs]
2011-01-04T18:43:46.517-0500: 224599.350: [GC 224599.350: [ParNew:  
757759K->151552K(757760K), 0.1540840 secs] 2064697K->1475010K 
(2408448K), 0.1544610 secs] [Times: user=0.72 sys=0.00, real=0.15 secs]
2011-01-04T18:43:46.673-0500: 224599.506: [GC [1 CMS-initial-mark:  
1323458K(1650688K)] 1480665K(2408448K), 0.1355380 secs] [Times:  
user=0.13 sys=0.00, real=0.14 secs]
2011-01-04T18:43:46.809-0500: 224599.642: [CMS-concurrent-mark-start]
2011-01-04T18:43:48.464-0500: 224601.297: [CMS-concurrent-mark:  
1.656/1.656 secs] [Times: user=3.44 sys=0.04, real=1.66 secs]
2011-01-04T18:43:48.464-0500: 224601.297: [CMS-concurrent-preclean- 
start]
2011-01-04T18:43:48.478-0500: 224601.311: [CMS-concurrent-preclean:  
0.013/0.014 secs] [Times: user=0.01 sys=0.00, real=0.01 secs]
2011-01-04T18:43:48.478-0500: 224601.311: [CMS-concurrent-abortable- 
preclean-start]
  CMS: abort preclean due to time 2011-01-04T18:43:53.604-0500:  
224606.437: [CMS-concurrent-abortable-preclean: 4.402/5.126 secs]  
[Times: user=5.51 sys=0.13, real=5.13 secs]
2011-01-04T18:43:53.606-0500: 224606.439: [GC[YG occupancy: 354174 K  
(757760 K)]224606.439: [Rescan (parallel) , 0.0620250 secs]224606.501:  
[weak refs processing, 0.0001870 secs]224606.501: [class unloading,  
0.1428830 secs]224606.644: [scrub symbol & string tables, 0.0630710  
secs] [1 CMS-remark: 1323458K(1650688K)] 1677633K(2408448K), 0.2790260  
secs] [Times: user=0.60 sys=0.00, real=0.28 secs]
2011-01-04T18:43:53.886-0500: 224606.719: [CMS-concurrent-sweep-start]
2011-01-04T18:43:54.763-0500: 224607.596: [CMS-concurrent-sweep:  
0.877/0.877 secs] [Times: user=0.96 sys=0.01, real=0.88 secs]
2011-01-04T18:43:54.763-0500: 224607.596: [CMS-concurrent-reset-start]
2011-01-04T18:43:54.767-0500: 224607.600: [CMS-concurrent-reset:  
0.004/0.004 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
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