JVM CMS垃圾收集问题

我在使用Concurrent Mark-Sweep收集器的应用程序的GC日志文件中看到以下症状:

4031.248: [CMS-concurrent-preclean-start]
4031.250: [CMS-concurrent-preclean: 0.002/0.002 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
4031.250: [CMS-concurrent-abortable-preclean-start]
 CMS: abort preclean due to time 4036.346: [CMS-concurrent-abortable-preclean: 0.159/5.096 secs] [Times: user=0.00 sys=0.01, real=5.09 secs] 
4036.346: [GC[YG occupancy: 55964 K (118016 K)]4036.347: [Rescan (parallel) , 0.0641200 secs]4036.411: [weak refs processing, 0.0001300 secs]4036.411: [class unloading, 0.0041590 secs]4036.415: [scrub symbol & string tables, 0.0053220 secs] [1 CMS-remark: 16015K(393216K)] 71979K(511232K), 0.0746640 secs] [Times: user=0.08 sys=0.00, real=0.08 secs] 

预清洁过程不断中止.我已经尝试将CMSMaxAbortablePrecleanTime从默认值5调整为15秒,但这没有帮助.当前的JVM选项如下......

Djava.awt.headless=true
 -Xms512m
 -Xmx512m
 -Xmn128m
 -XX:MaxPermSize=128m
 -XX:+HeapDumpOnOutOfMemoryError
 -XX:+UseParNewGC
 -XX:+UseConcMarkSweepGC
 -XX:BiasedLockingStartupDelay=0
 -XX:+DoEscapeAnalysis
 -XX:+UseBiasedLocking
 -XX:+EliminateLocks
 -XX:+CMSParallelRemarkEnabled
 -verbose:gc
 -XX:+PrintGCTimeStamps
 -XX:+PrintGCDetails
 -XX:+PrintHeapAtGC
 -Xloggc:gc.log
 -XX:+CMSClassUnloadingEnabled
 -XX:+CMSPermGenPrecleaningEnabled
 -XX:CMSInitiatingOccupancyFraction=50
 -XX:ReservedCodeCacheSize=64m
 -Dnetworkaddress.cache.ttl=30
 -Xss128k

似乎并发 - 流产 - 预清洁永远不会有机会跑.我通过https://blogs.oracle.com/jonthecollector/entry/did_you_know阅读了有关启用CMSScavengeBeforeRemark的建议,但暂停的副作用似乎并不理想.任何人都可以提出任何建议吗？

此外,我想知道是否有人有一个很好的参考grokking CMS GC日志,特别是这一行:

[1 CMS-remark: 16015K(393216K)] 71979K(511232K), 0.0746640 secs]

不清楚这些数字所指的内存区域. 编辑 找到了这个http://www.sun.com/bigadmin/content/submitted/cms_gc_logs.jsp的链接