CMS

2018-05-09T15:22:00.647+0800: 1001442.901: [GC [1 CMS-initial-mark: 5439026K(7340032K)] 5667324K(8283776K), 0.0850250 secs] [Times: user=0.09 sys=0.00, real=0.08 secs] 
2018-05-09T15:22:00.732+0800: 1001442.986: [CMS-concurrent-mark-start]
2018-05-09T15:22:03.955+0800: 1001446.209: [CMS-concurrent-mark: 3.223/3.223 secs] [Times: user=12.69 sys=0.10, real=3.22 secs] 
2018-05-09T15:22:03.955+0800: 1001446.209: [CMS-concurrent-preclean-start]
2018-05-09T15:22:03.969+0800: 1001446.223: [CMS-concurrent-preclean: 0.015/0.015 secs] [Times: user=0.01 sys=0.00, real=0.02 secs] 
2018-05-09T15:22:03.970+0800: 1001446.223: [CMS-concurrent-abortable-preclean-start]
 CMS: abort preclean due to time 2018-05-09T15:22:09.124+0800: 1001451.378: [CMS-concurrent-abortable-preclean: 4.753/5.155 secs] [Times: user=4.80 sys=0.01, real=5.15 secs] 
2018-05-09T15:22:09.127+0800: 1001451.380: [GC[YG occupancy: 239405 K (943744 K)]2018-05-09T15:22:09.127+0800: 1001451.380: [Rescan (parallel) , 0.0840610 secs]2018-05-09T15:22:09.211+0800: 1001451.465: [weak refs processing, 0.0000500 secs]2018-05-09T15:22:09.211+0800: 1001451.465: [scrub string table, 0.0008560 secs] [1 CMS-remark: 5439026K(7340032K)] 5678431K(8283776K), 0.0850980 secs] [Times: user=1.29 sys=0.01, real=0.09 secs] 
2018-05-09T15:22:09.212+0800: 1001451.466: [CMS-concurrent-sweep-start]
2018-05-09T15:22:11.882+0800: 1001454.136: [CMS-concurrent-sweep: 2.671/2.671 secs] [Times: user=2.69 sys=0.01, real=2.67 secs] 
2018-05-09T15:22:11.883+0800: 1001454.136: [CMS-concurrent-reset-start]
2018-05-09T15:22:11.904+0800: 1001454.157: [CMS-concurrent-reset: 0.021/0.021 secs] [Times: user=0.02 sys=0.00, real=0.02 secs] 

2018-05-09T15:20:52.722+0800: 1001374.976: [GC [1 CMS-initial-mark: 6438483K(7340032K)] 7256213K(8283776K), 0.2855720 secs] [Times: user=0.29 sys=0.00, real=0.29 secs] 
2018-05-09T15:20:53.008+0800: 1001375.262: [CMS-concurrent-mark-start]
2018-05-09T15:20:53.206+0800: 1001375.460: [GC2018-05-09T15:20:53.206+0800: 1001375.460: [ParNew: 943744K->104832K(943744K), 0.1943620 secs] 7382227K->6748969K(8283776K), 0.1946240 secs] [Times: user=2.32 sys=0.01, real=0.20 secs] 
2018-05-09T15:20:54.564+0800: 1001376.817: [GC2018-05-09T15:20:54.564+0800: 1001376.818: [ParNew: 943744K->104832K(943744K), 0.1989060 secs] 7587881K->6955901K(8283776K), 0.1991750 secs] [Times: user=2.42 sys=0.00, real=0.20 secs] 
2018-05-09T15:20:56.002+0800: 1001378.256: [GC2018-05-09T15:20:56.002+0800: 1001378.256: [ParNew: 943744K->104832K(943744K), 0.1942430 secs] 7794813K->7164368K(8283776K), 0.1944880 secs] [Times: user=2.37 sys=0.01, real=0.19 secs] 
2018-05-09T15:20:57.091+0800: 1001379.345: [CMS-concurrent-mark: 3.484/4.083 secs] [Times: user=23.48 sys=0.16, real=4.08 secs] 
2018-05-09T15:20:57.091+0800: 1001379.345: [CMS-concurrent-preclean-start]
2018-05-09T15:20:57.406+0800: 1001379.660: [GC2018-05-09T15:20:57.406+0800: 1001379.660: [ParNew: 943744K->104832K(943744K), 0.2003770 secs] 8003280K->7374243K(8283776K), 0.2006390 secs] [Times: user=2.36 sys=0.01, real=0.20 secs] 
2018-05-09T15:20:57.941+0800: 1001380.195: [CMS-concurrent-preclean: 0.643/0.850 secs] [Times: user=3.47 sys=0.02, real=0.85 secs] 
2018-05-09T15:20:57.941+0800: 1001380.195: [CMS-concurrent-abortable-preclean-start]
2018-05-09T15:20:57.941+0800: 1001380.195: [CMS-concurrent-abortable-preclean: 0.000/0.000 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
2018-05-09T15:20:57.943+0800: 1001380.197: [GC[YG occupancy: 357558 K (943744 K)]2018-05-09T15:20:57.943+0800: 1001380.197: [Rescan (parallel) , 0.0176570 secs]2018-05-09T15:20:57.961+0800: 1001380.215: [weak refs processing, 0.0000370 secs]2018-05-09T15:20:57.961+0800: 1001380.215: [scrub string table, 0.0007630 secs] [1 CMS-remark: 7269411K(7340032K)] 7626970K(8283776K), 0.0186060 secs] [Times: user=0.27 sys=0.00, real=0.02 secs] 
2018-05-09T15:20:57.962+0800: 1001380.216: [CMS-concurrent-sweep-start]
2018-05-09T15:20:58.766+0800: 1001381.020: [GC2018-05-09T15:20:58.767+0800: 1001381.020: [ParNew: 943744K->943744K(943744K), 0.0000270 secs]2018-05-09T15:20:58.767+0800: 1001381.020: [CMS2018-05-09T15:21:08.319+0800: 1001390.573: [CMS-concurrent-sweep: 10.353/10.357 secs] [Times: user=10.96 sys=0.01, real=10.36 secs] 
 (concurrent mode failure): 7269411K->5444669K(7340032K), 23.4952970 secs] 8213155K->5444669K(8283776K), [CMS Perm : 43424K->43424K(262144K)], 23.4955490 secs] [Times: user=23.49 sys=0.02, real=23.50 secs] 

image.png

-XX:+DisableExplicitGC 
-XX:+UseParNewGC 
-XX:+UseConcMarkSweepGC 
-XX:+CMSParallelRemarkEnabled 
-XX:+UseCMSCompactAtFullCollection 
-XX:ParallelGCThreads=16 
-XX:+UseCMSInitiatingOccupancyOnly 
-XX:CMSInitiatingOccupancyFraction=68 
-Xms8g -Xmx8g -Xmn1536g -XX:PermSize=256m -XX:MaxPermSize=512M 
-verbose:gc -Xloggc:/logs/hive/hivemeta.gc.log-`date +'%Y%m%d%H%M'` 
-XX:+PrintGCDetails 
-XX:+PrintGCTimeStamps 
-XX:+PrintGCDateStamps 
-XX:CMSFullGCsBeforeCompaction=0 "