52G total heap
20G old
32G young
survival ratio 6: 24G + 4G + 4G
time in young gc: 59.3 secs + 1 cms

java -Xms52g -Xmx52g 
-verbose:gc 
-XX:+PrintGCDetails 
-XX:+PrintGCTimeStamps 
-Xloggc:gc.txt 
-XX:+PrintTenuringDistribution 
-XX:+UseConcMarkSweepGC 
-Xmn32g 
-XX:SurvivorRatio=6 
-XX:+DoEscapeAnalysis 


83.794: [Full GC 83.795: [CMS: 0K->607518K(20971520K), 3.4108250 secs] 12582921K->607518K(50331648K), [CMS Perm : 21247K->21203K(21248K)], 3.4111450 secs] [Times: user=2.61 sys=0.81, real=3.42 secs] 
403.691: [Full GC 403.691: [CMS: 607518K->1305234K(20971520K), 8.0812400 secs] 22067683K->1305234K(50331648K), [CMS Perm : 35269K->35237K(35340K)], 8.0815550 secs] [Times: user=7.45 sys=0.62, real=8.09 secs] 
602.412: [GC 602.412: [ParNew
Desired survivor size 2147483648 bytes, new threshold 15 (max 15)
- age   1: 1827497400 bytes, 1827497400 total
: 25165824K->1793150K(29360128K), 1.8432970 secs] 26471058K->3098384K(50331648K), 1.8433920 secs] [Times: user=8.52 sys=3.90, real=1.84 secs] 
615.678: [GC 615.679: [ParNew
Desired survivor size 2147483648 bytes, new threshold 1 (max 15)
- age   1: 2465547784 bytes, 2465547784 total
- age   2: 1749118112 bytes, 4214665896 total
: 26958974K->4194304K(29360128K), 2.8499640 secs] 28264208K->5544533K(50331648K), 2.8500910 secs] [Times: user=14.40 sys=8.01, real=2.85 secs] 
634.843: [GC 634.844: [ParNew
Desired survivor size 2147483648 bytes, new threshold 1 (max 15)
- age   1: 2583313232 bytes, 2583313232 total
: 29360128K->4194304K(29360128K), 24.1741840 secs] 30710357K->9734665K(50331648K), 24.1743260 secs] [Times: user=30.51 sys=13.85, real=24.17 secs] 
880.506: [GC 880.506: [ParNew
Desired survivor size 2147483648 bytes, new threshold 15 (max 15)
- age   1: 1755917992 bytes, 1755917992 total
: 29360128K->3437225K(29360128K), 12.8182960 secs] 34900489K->11464781K(50331648K), 12.8185690 secs] [Times: user=12.55 sys=1.52, real=12.82 secs] 
1066.473: [GC 1066.473: [ParNew
Desired survivor size 2147483648 bytes, new threshold 1 (max 15)
- age   1: 2734473296 bytes, 2734473296 total
- age   2: 1370119192 bytes, 4104592488 total
: 28603049K->4194304K(29360128K), 1.9609130 secs] 36630605K->12269711K(50331648K), 1.9610370 secs] [Times: user=12.20 sys=2.20, real=1.96 secs] 
1184.463: [GC 1184.464: [ParNew
Desired survivor size 2147483648 bytes, new threshold 15 (max 15)
- age   1:  171727968 bytes,  171727968 total
: 29360128K->3339318K(29360128K), 15.6586110 secs] 37435535K->15418107K(50331648K), 15.6587490 secs] [Times: user=14.31 sys=8.85, real=15.66 secs] 
1200.135: [GC [1 CMS-initial-mark: 12078788K(20971520K)] 15431604K(50331648K), 0.1067290 secs] [Times: user=0.11 sys=0.00, real=0.10 secs] 
1200.242: [CMS-concurrent-mark-start]
1212.393: [CMS-concurrent-mark: 11.729/12.151 secs] [Times: user=34.39 sys=0.22, real=12.15 secs] 
1212.393: [CMS-concurrent-preclean-start]
1212.486: [CMS-concurrent-preclean: 0.086/0.093 secs] [Times: user=0.27 sys=0.01, real=0.10 secs] 
1212.486: [CMS-concurrent-abortable-preclean-start]
 CMS: abort preclean due to time 1217.538: [CMS-concurrent-abortable-preclean: 3.596/5.052 secs] [Times: user=5.43 sys=0.01, real=5.05 secs] 
1217.558: [GC[YG occupancy: 11267978 K (29360128 K)]1217.558: [Rescan (parallel) , 4.7523880 secs]1222.310: [weak refs processing, 0.0002360 secs] [1 CMS-remark: 12078788K(20971520K)] 23346767K(50331648K), 4.7528380 secs]