This is a GC detail log printed by **ConcMarkSweepGC**.It seems that this log doesn't tell how much space be collected in this GarbageCollection.

My current JAVA\_OPTS is
`-XX:+UseConcMarkSweepGC -Xloggc:/home/admin/logs/gc.log -XX:+PrintGCDetails -XX:+PrintGCDateStamps`

Do I really can't know how much space be collected in this GarbageCollection? 

Is my **JAVA\_OPTS** faulty?

Logs:

```
2016-11-28T20:19:22.937+0800: 357765.356: [GC (CMS Initial Mark) [1 CMS-initial-mark: 1734329K(2097152K)] 1925288K(4019584K), 0.0715106 secs] [Times: user=0.24 sys=0.00, real=0.08 secs] 
2016-11-28T20:19:23.010+0800: 357765.429: [CMS-concurrent-mark-start]
2016-11-28T20:19:23.826+0800: 357766.246: [CMS-concurrent-mark: 0.815/0.817 secs] [Times: user=0.95 sys=0.04, real=0.81 secs] 
2016-11-28T20:19:23.827+0800: 357766.246: [CMS-concurrent-preclean-start]
2016-11-28T20:19:23.840+0800: 357766.260: [CMS-concurrent-preclean: 0.013/0.014 secs] [Times: user=0.02 sys=0.00, real=0.02 secs] 
2016-11-28T20:19:23.840+0800: 357766.260: [CMS-concurrent-abortable-preclean-start]
 CMS: abort preclean due to time 2016-11-28T20:19:29.079+0800: 357771.499: [CMS-concurrent-abortable-preclean: 5.229/5.239 secs] [Times: user=5.63 sys=0.11, real=5.24 secs] 
2016-11-28T20:19:29.081+0800: 357771.500: [GC (CMS Final Remark) [YG occupancy: 374645 K (1922432 K)]2016-11-28T20:19:29.081+0800: 357771.501: [Rescan (parallel) , 0.2260699 secs]2016-11-28T20:19:29.307+0800: 357771.727: [weak refs processing, 0.0007908 secs]2016-11-28T20:19:29.308+0800: 357771.727: [class unloading, 0.0830640 secs]2016-11-28T20:19:29.391+0800: 357771.811: [scrub symbol table, 0.0242131 secs]2016-11-28T20:19:29.415+0800: 357771.835: [scrub string table, 0.0032310 secs][1 CMS-remark: 1734329K(2097152K)] 2108975K(4019584K), 0.3421430 secs] [Times: user=1.00 sys=0.00, real=0.34 secs] 
2016-11-28T20:19:29.424+0800: 357771.843: [CMS-concurrent-sweep-start]
2016-11-28T20:19:30.204+0800: 357772.623: [CMS-concurrent-sweep: 0.780/0.780 secs] [Times: user=0.86 sys=0.01, real=0.78 secs] 
2016-11-28T20:19:30.204+0800: 357772.623: [CMS-concurrent-reset-start]
2016-11-28T20:19:30.214+0800: 357772.633: [CMS-concurrent-reset: 0.010/0.010 secs] [Times: user=0.01 sys=0.00, real=0.01 secs] 

```