即使有足够的java内存 – 为什么重复java垃圾收集

我们的JVM args是：JVM_GC =“ – verbose：gc -Xnoclassgc -XX：PrintGCDetails -XX：UseParNewGC -XX：NewSize = 3GB -XX：ParallelGCThreads = 8 -XX：MaxTenuringThreshold = 15 -XX：UseConcMarkSweepGC”

和MinHeap = MaxHeap = 10GB

什么可能触发GC？为什么它经常发生并且太快？
除了通过JMX获取一些设置之外,我们无法将任何类型的分析工具连接为其生产框…
谢谢
….. GC日志….

@ 2011-07-20 02:10:46 [Full GC(System)[CMS：3333423K-> 4019122K(7340032K),13.4979250 secs] 4876606K-> 4019122K(10171200K),[CMS Perm：21656K-> 21608K (21824K)],13.4980930秒
s] [时间：用户= 12.99 sys = 0.50,真实= 13.50秒]
[GC [1 CMS-initial-mark：4019122K(7340032K)] 4041525K(10171200K),0.0009110 secs] [次：用户= 0.00 sys = 0.00,real = 0.00 secs] @ 2011-07-20 02:11:10 [ CMS并发标记：10.322 / 10.753秒] [时间：用户= 21.55 sys = 0.22,实际= 10.75秒]
[CMS-concurrent-preclean：0.035 / 0.036 secs] [次：用户= 0.04 sys = 0.00,real = 0.04 secs] @ 2011-07-20 02:11:15
CMS：因时间而中止预扫[CMS-concurrent-abortable-preclean：1.083 / 5.063 secs] [次：用户= 1.08 sys = 0.00,real = 5.06 secs]
[GC [YG占有率：282204 K(2831168 K)] [重新扫描(平行),0.0402030秒] [弱参考处理,0.0010550秒] [1 CMS-备注：4019122K(7340032K)] 4301
326K(10171200K),0.0413630秒] [次：用户= 0.07 sys = 0.01,real = 0.04 secs] @ 2011-07-20 02:11:16
[CMS-concurrent-sweep：2.627 / 2.627 secs] [时间：用户= 2.63 sys = 0.00,真实= 2.63秒]
[CMS-concurrent-reset：0.039 / 0.039 secs] [次：用户= 0.04 sys = 0.00,real = 0.04 secs] @ 2011-07-20 02:11:20
[GC [1 CMS-initial-mark：4019034K(7340032K)] 4301238K(10171200K),0.0308450 secs] [次：用户= 0.03 sys = 0.00,real = 0.03 secs] @ 2011-07-20 02:11:30
[CMS-concurrent-mark：10.304 / 10.307 secs] [时间：用户= 20.48 sys = 0.11,真实= 10.31秒]
[CMS-concurrent-preclean：0.018 / 0.019 secs] [次：用户= 0.02 sys = 0.00,real = 0.01 secs] @ 2011-07-20 02:11:35
CMS：因时间而中止预扫[CMS-并发 – 流产 – 预清洁：1.043 / 5.048秒]时间：用户= 1.03 sys = 0.00,实际= 5.05秒]
[GC [YG占有率：282204 K(2831168 K)] [重新扫描(平行),0.0419560秒] [弱参考处理,0.0010880秒] [1 CMS-备注：4019034K(7340032K)] 4301
238K(10171200K),0.0431480秒] [时间：用户= 0.07 sys = 0.01,实际= 0.05秒] @ 2011-07-20 02:11:38
[CMS-concurrent-sweep：2.622 / 2.622 secs] [时间：用户= 2.63 sys = 0.00,真实= 2.62秒]
[CMS-concurrent-reset：0.039 / 0.039 secs] [次：用户= 0.04 sys = 0.00,real = 0.04 secs]