0 Replies Latest reply on Jun 5, 2017 12:02 PM by 2894394

    Slow GC on young generation

    2894394

      We're running the jvm w/ these settings on 400GB RAM machine

      -XX:NewRatio=8

      -XX:+UseParallelGC

      -XX:+UseParallelOldGC

      -Xms100000m

      -Xmx260000m

       

      Looks like at some point GC is having tough time w/ the young generation

       

      Does it mean we should lower NewRatio further down from 8 ?

       

      2017-06-05T00:47:24.494+0530: 198982.587: Total time for which application threads were stopped: 0.0007017 seconds, Stopping threads took: 0.0000354 seconds

      2017-06-05T00:47:46.327+0530: 199004.420: [GC (Allocation Failure) [PSYoungGen: 12598038K->3171265K(19276288K)] 106063392K->96636619K(255934464K), 0.6283683 secs] [Times: user=7.90 sys=0.01, real=0.63 secs]

      2017-06-05T00:47:46.956+0530: 199005.049: Total time for which application threads were stopped: 0.6295106 seconds, Stopping threads took: 0.0001466 seconds

      2017-06-05T00:47:49.838+0530: 199007.930: [GC (Allocation Failure) [PSYoungGen: 15698881K->6951414K(19479040K)] 109164235K->109162915K(256137216K), 182.1428060 secs] [Times: user=17.43 sys=15.83, real=182.16 secs]

      2017-06-05T00:50:52.019+0530: 199190.112: Total time for which application threads were stopped: 182.1824677 seconds, Stopping threads took: 0.0000794 seconds

      2017-06-05T00:50:53.702+0530: 199191.795: [GC (Allocation Failure) [PSYoungGen: 19479030K->8476600K(18337280K)] 121690531K->121671710K(254995456K), 346.0100450 secs] [Times: user=17.46 sys=277.68, real=345.96 secs]

      2017-06-05T00:56:39.712+0530: 199537.805: Total time for which application threads were stopped: 346.0113009 seconds, Stopping threads took: 0.0000906 seconds

      2017-06-05T00:56:41.131+0530: 199539.223: [GC (Allocation Failure) [PSYoungGen: 18337208K->9860583K(19721216K)] 131532318K->131519505K(256379392K), 563.8806887 secs] [Times: user=10.91 sys=3397.72, real=563.82 secs]    <=========

      2017-06-05T01:06:05.037+0530: 200103.130: Total time for which application threads were stopped: 563.9201726 seconds, Stopping threads took: 0.0131172 seconds