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POrepeated java garbage collection even though there is enough java memory- why
 

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  1. POrepeated java garbage collection even though there is enough java memory- why
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    <p>Our java process is eating up lot of CPU and the log shows its doing GC too often even though used memory is ~5GB (taken from JMX console) and the Min and Max mem is 10GB.</p> <p>our JVM args is : JVM_GC="-verbose:gc -Xnoclassgc -XX:+PrintGCDetails -XX:+UseParNewGC -XX:NewSize=3GB -XX:ParallelGCThreads=8 -XX:MaxTenuringThreshold=15 -XX:+UseConcMarkSweepGC"</p> <p>and MinHeap=MaxHeap=10GB <br></p> <p><em><strong>any idea what might be triggering GC? and why is it happening to often and too soon? We cant connect any sort of profiling tool as its production box apart from getting some settings via JMX...</em></strong> Thanks ..... GC log .... </p> <p><strong>@2011-07-20 02:10:46</strong> <br>[Full GC (System) [CMS: 3333423K->4019122K(7340032K), 13.4979250 secs] 4876606K->4019122K(10171200K), [CMS Perm : 21656K->21608K(21824K)], 13.4980930 sec s] [Times: user=12.99 sys=0.50, real=13.50 secs] <br> [GC [1 CMS-initial-mark: 4019122K(7340032K)] 4041525K(10171200K), 0.0009110 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]<br> <strong>@2011-07-20 02:11:10</strong><br> [CMS-concurrent-mark: 10.322/10.753 secs] [Times: user=21.55 sys=0.22, real=10.75 secs]<br> [CMS-concurrent-preclean: 0.035/0.036 secs] [Times: user=0.04 sys=0.00, real=0.04 secs]<br><strong>@2011-07-20 02:11:15</strong> <br> CMS: abort preclean due to time [CMS-concurrent-abortable-preclean: 1.083/5.063 secs] [Times: user=1.08 sys=0.00, real=5.06 secs]<br> [GC[YG occupancy: 282204 K (2831168 K)][Rescan (parallel) , 0.0402030 secs][weak refs processing, 0.0010550 secs] <br>[1 CMS-remark: 4019122K(7340032K)] 4301 326K(10171200K), 0.0413630 secs] [Times: user=0.07 sys=0.01, real=0.04 secs]<br><strong>@2011-07-20 02:11:16</strong><br> [CMS-concurrent-sweep: 2.627/2.627 secs] [Times: user=2.63 sys=0.00, real=2.63 secs]<br> [CMS-concurrent-reset: 0.039/0.039 secs] [Times: user=0.04 sys=0.00, real=0.04 secs]<br><strong>@2011-07-20 02:11:20</strong><br> [GC [1 CMS-initial-mark: 4019034K(7340032K)] 4301238K(10171200K), 0.0308450 secs] [Times: user=0.03 sys=0.00, real=0.03 secs]<br><strong>@2011-07-20 02:11:30</strong><br> [CMS-concurrent-mark: 10.304/10.307 secs] [Times: user=20.48 sys=0.11, real=10.31 secs]<br> [CMS-concurrent-preclean: 0.018/0.019 secs] [Times: user=0.02 sys=0.00, real=0.01 secs]<br><strong>@2011-07-20 02:11:35</strong><br> CMS: abort preclean due to time [CMS-concurrent-abortable-preclean: 1.043/5.048 secs] Times: user=1.03 sys=0.00, real=5.05 secs]<br> [GC[YG occupancy: 282204 K (2831168 K)][Rescan (parallel) , 0.0419560 secs][weak refs processing, 0.0010880 secs] <br>[1 CMS-remark: 4019034K(7340032K)] 4301 238K(10171200K), 0.0431480 secs] [Times: user=0.07 sys=0.01, real=0.05 secs]<br><strong>@2011-07-20 02:11:38</strong><br> [CMS-concurrent-sweep: 2.622/2.622 secs] [Times: user=2.63 sys=0.00, real=2.62 secs]<br> [CMS-concurrent-reset: 0.039/0.039 secs] [Times: user=0.04 sys=0.00, real=0.04 secs]<br></p>
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    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USDhana Krishnasamy
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
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      1. POrepeated java garbage collection even though there is enough java memory- why
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
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      1. POrepeated java garbage collection even though there is enough java memory- why
      1. This table or related slice is empty.
      1. VTUpMod
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      1. POrepeated java garbage collection even though there is enough java memory- why
      1. USzacheusz
      1. VTFavorite
    1. COThe G1 collector is a compacting tenured GC, if you can try it.
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      1. POrepeated java garbage collection even though there is enough java memory- why
      1. USPeter Lawrey
    2. COwhat os is this running on?
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      1. POrepeated java garbage collection even though there is enough java memory- why
      1. USSean
    3. COMaybe your old generation is close to full, try give it more space.
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      1. POrepeated java garbage collection even though there is enough java memory- why
      1. USirreputable
 

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