945188.489: [GC 945188.489: [ParNew: 224543K->14968K(235968K), 0.0506680 secs] 552200K->344514K(1022400K), 0.0507700 secs]
945242.102: [GC 945242.102: [ParNew: 224760K->15374K(235968K), 0.0632410 secs] 554306K->346710K(1022400K), 0.0633450 secs]
945270.397: [GC 945270.402: [ParNew: 225163K->225163K(235968K), 0.0000230 secs]945270.402: [CMS (concurrent mode failure)[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor70]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor58]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor38]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor62]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor54]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor74]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor53]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor73]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor64]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor39]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor59]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor51]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor42]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor48]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor76]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor52]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor57]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor61]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor56]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor55]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor63]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor60]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor40]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor65]
: 331336K->71676K(786432K), 13.8120660 secs] 556499K->71676K(1022400K), 13.8122360 secs]
945289.234: [GC 945289.234: [ParNew: 209792K->2581K(235968K), 0.0065240 secs] 281468K->74257K(1022400K), 0.0066160 secs]
945324.703: [GC 945324.703: [ParNew: 212373K->3829K(235968K), 0.0081040 secs] 284049K->75506K(1022400K), 0.0082040 secs]
java version "1.5.0_16"
系统在运行一段时间后(5天左右)会开始出现这样的GC,每几个小时就会做一次?谁能帮忙分析一下原因? JVM配置
-server
-Xmx1024m
-Xms1024m
-XX:NewSize=256m
-XX:MaxNewSize=256m
-XX:PermSize=128m
-XX:MaxPermSize=128m
-XX:SurvivorRatio=8
-XX:+PrintGCDetails
-XX:+PrintGCTimeStamps
-XX:+UseConcMarkSweepGC
-XX:+UseCMSCompactAtFullCollection
-XX:CMSFullGCsBeforeCompaction=5
-XX:CMSInitiatingOccupancyFraction=60
-XX:CMSMaxAbortablePrecleanTime=5
-XX:+CMSPermGenSweepingEnabled
-XX:+CMSClassUnloadingEnabled
-XX:MaxGCPauseMillis=1500
945242.102: [GC 945242.102: [ParNew: 224760K->15374K(235968K), 0.0632410 secs] 554306K->346710K(1022400K), 0.0633450 secs]
945270.397: [GC 945270.402: [ParNew: 225163K->225163K(235968K), 0.0000230 secs]945270.402: [CMS (concurrent mode failure)[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor70]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor58]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor38]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor62]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor54]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor74]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor53]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor73]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor64]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor39]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor59]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor51]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor42]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor48]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor76]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor52]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor57]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor61]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor56]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor55]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor63]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor60]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor40]
[Unloading class sun.reflect.GeneratedSerializationConstructorAccessor65]
: 331336K->71676K(786432K), 13.8120660 secs] 556499K->71676K(1022400K), 13.8122360 secs]
945289.234: [GC 945289.234: [ParNew: 209792K->2581K(235968K), 0.0065240 secs] 281468K->74257K(1022400K), 0.0066160 secs]
945324.703: [GC 945324.703: [ParNew: 212373K->3829K(235968K), 0.0081040 secs] 284049K->75506K(1022400K), 0.0082040 secs]
java version "1.5.0_16"
系统在运行一段时间后(5天左右)会开始出现这样的GC,每几个小时就会做一次?谁能帮忙分析一下原因? JVM配置
-server
-Xmx1024m
-Xms1024m
-XX:NewSize=256m
-XX:MaxNewSize=256m
-XX:PermSize=128m
-XX:MaxPermSize=128m
-XX:SurvivorRatio=8
-XX:+PrintGCDetails
-XX:+PrintGCTimeStamps
-XX:+UseConcMarkSweepGC
-XX:+UseCMSCompactAtFullCollection
-XX:CMSFullGCsBeforeCompaction=5
-XX:CMSInitiatingOccupancyFraction=60
-XX:CMSMaxAbortablePrecleanTime=5
-XX:+CMSPermGenSweepingEnabled
-XX:+CMSClassUnloadingEnabled
-XX:MaxGCPauseMillis=1500
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lz遇到的问题是什么?
这次GC导致应用程序暂停了13s,不能接受啊
但是按照我的配置,旧生代空间为786432K,从上面的Log:331336K->71676K(786432K), 13.8120660 secs来看,似乎不应该发生CMS (concurrent mode failure)
-XX:MaxPermSize=128m 这两个是不是给得太少了?
但是有人能解释一下这里concurrent mode failure的原因吗?