旧世代は常に100％> CPU使用率が100％になる

Question

基本的にSpring Rest MVCプロジェクトであるJavaアプリケーションを私のプロダクションで実行しています。私が見てきたことは、アプリケーションのヒープ使用率が10％から最大78％までゆっくりとゆっくりと増加することです。

78％に達すると、自分のノードのCPU使用率は100％一定になります。フルGCが頻繁に実行されているようです。ここで

は私の設定です：ここでは

-XX:CMSInitiatingOccupancyFraction=60 -XX:+CMSParallelRemarkEnabled -XX:+DoEscapeAnalysis -XX:InitialHeapSize=4294967296 -XX:LargePageSizeInBytes=268435456 -XX:+ManagementServer -XX:MaxHeapSize=12884901888 -XX:MaxNewSize=5368709120 -XX:MaxPermSize=1073741824 -XX:MaxTenuringThreshold=0 -XX:NewSize=536870912 -XX:OldPLABSize=16 -XX:ParallelGCThreads=12 -XX:PermSize=536870912 -XX:+PrintGC -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:SurvivorRatio=16 -XX:+UseCMSInitiatingOccupancyOnly -XX:+UseCompressedOops -XX:+UseConcMarkSweepGC -XX:+UseParNewGC 

はあなたが一定の高CPU使用率を見ることができるのVisual GCのスナップショット

です。 これらは、GCログエントリの一部です：

2017-10-02T08:54:42.768+0530: 163327.650: [CMS-concurrent-preclean-start] 
2017-10-02T08:54:42.789+0530: 163327.671: [CMS-concurrent-preclean: 0.021/0.021 secs] [Times: user=0.02 sys=0.00, real=0.02 secs] 
2017-10-02T08:54:42.789+0530: 163327.671: [CMS-concurrent-abortable-preclean-start] 
2017-10-02T08:54:42.789+0530: 163327.671: [CMS-concurrent-abortable-preclean: 0.000/0.000 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
2017-10-02T08:54:42.790+0530: 163327.672: [GC[YG occupancy: 3025966 K (3466240 K)]2017-10-02T08:54:42.790+0530: 163327.672: [Rescan (parallel) , 6.7814290 secs]2017-10-02T08:54:49.571+0530: 163334.453: [weak refs processing, 0.0000540 secs]2017-10-02T08:54:49.572+0530: 163334.453: [scrub string table, 0.0013940 secs] [1 CMS-remark: 7340030K(7340032K)] 10365996K(10806272K), 6.7830680 secs] [Times: user=26.59 sys=0.48, real=6.79 secs] 
2017-10-02T08:54:49.573+0530: 163334.455: [CMS-concurrent-sweep-start] 
2017-10-02T08:54:53.196+0530: 163338.078: [CMS-concurrent-sweep: 3.618/3.623 secs] [Times: user=3.80 sys=0.02, real=3.62 secs] 
2017-10-02T08:54:53.196+0530: 163338.078: [CMS-concurrent-reset-start] 
2017-10-02T08:54:53.212+0530: 163338.094: [CMS-concurrent-reset: 0.015/0.015 secs] [Times: user=0.02 sys=0.00, real=0.02 secs] 
2017-10-02T08:54:54.143+0530: 163339.025: [GC [1 CMS-initial-mark: 7340030K(7340032K)] 10382251K(10806272K), 2.1178610 secs] [Times: user=2.12 sys=0.00, real=2.12 secs] 
2017-10-02T08:54:56.261+0530: 163341.143: [CMS-concurrent-mark-start] 
2017-10-02T08:55:00.966+0530: 163345.848: [CMS-concurrent-mark: 4.700/4.705 secs] [Times: user=14.18 sys=0.03, real=4.70 secs] 
2017-10-02T08:55:00.966+0530: 163345.848: [CMS-concurrent-preclean-start] 
2017-10-02T08:55:00.987+0530: 163345.869: [CMS-concurrent-preclean: 0.020/0.021 secs] [Times: user=0.02 sys=0.00, real=0.02 secs] 
2017-10-02T08:55:00.987+0530: 163345.869: [CMS-concurrent-abortable-preclean-start] 
2017-10-02T08:55:00.987+0530: 163345.869: [CMS-concurrent-abortable-preclean: 0.000/0.000 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
2017-10-02T08:55:00.988+0530: 163345.870: [GC[YG occupancy: 3046326 K (3466240 K)]2017-10-02T08:55:00.988+0530: 163345.870: [Rescan (parallel) , 7.3009290 secs]2017-10-02T08:55:08.289+0530: 163353.171: [weak refs processing, 0.0000540 secs]2017-10-02T08:55:08.289+0530: 163353.171: [scrub string table, 0.0013900 secs] [1 CMS-remark: 7340030K(7340032K)] 10386356K(10806272K), 7.3026000 secs] [Times: user=28.62 sys=0.52, real=7.31 secs] 
2017-10-02T08:55:08.291+0530: 163353.173: [CMS-concurrent-sweep-start] 
2017-10-02T08:55:12.068+0530: 163356.950: [CMS-concurrent-sweep: 3.773/3.777 secs] [Times: user=3.96 sys=0.04, real=3.77 secs] 
2017-10-02T08:55:12.068+0530: 163356.950: [CMS-concurrent-reset-start] 
2017-10-02T08:55:12.084+0530: 163356.966: [CMS-concurrent-reset: 0.016/0.016 secs] [Times: user=0.02 sys=0.00, real=0.02 secs] 
2017-10-02T08:55:12.140+0530: 163357.021: [GC [1 CMS-initial-mark: 7340030K(7340032K)] 10397770K(10806272K), 2.1250470 secs] [Times: user=2.13 sys=0.00, real=2.13 secs] 
2017-10-02T08:55:14.265+0530: 163359.147: [CMS-concurrent-mark-start] 
2017-10-02T08:55:18.472+0530: 163363.354: [CMS-concurrent-mark: 4.202/4.207 secs] [Times: user=12.73 sys=0.03, real=4.21 secs] 
2017-10-02T08:55:18.472+0530: 163363.354: [CMS-concurrent-preclean-start] 
2017-10-02T08:55:18.498+0530: 163363.380: [CMS-concurrent-preclean: 0.025/0.026 secs] [Times: user=0.03 sys=0.00, real=0.02 secs] 
2017-10-02T08:55:18.498+0530: 163363.380: [CMS-concurrent-abortable-preclean-start] 
2017-10-02T08:55:18.498+0530: 163363.380: [CMS-concurrent-abortable-preclean: 0.000/0.000 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
2017-10-02T08:55:18.499+0530: 163363.381: [GC[YG occupancy: 3065834 K (3466240 K)]2017-10-02T08:55:18.499+0530: 163363.381: [Rescan (parallel) , 8.9283020 secs]2017-10-02T08:55:27.427+0530: 163372.309: [weak refs processing, 0.0000510 secs]2017-10-02T08:55:27.427+0530: 163372.309: [scrub string table, 0.0013920 secs] [1 CMS-remark: 7340030K(7340032K)] 10405864K(10806272K), 8.9299040 secs] [Times: user=34.99 sys=0.66, real=8.93 secs] 
2017-10-02T08:55:27.429+0530: 163372.311: [CMS-concurrent-sweep-start] 
2017-10-02T08:55:31.125+0530: 163376.007: [CMS-concurrent-sweep: 3.694/3.696 secs] [Times: user=3.80 sys=0.02, real=3.70 secs] 
2017-10-02T08:55:31.126+0530: 163376.007: [CMS-concurrent-reset-start] 
2017-10-02T08:55:31.141+0530: 163376.023: [CMS-concurrent-reset: 0.015/0.015 secs] [Times: user=0.02 sys=0.00, real=0.02 secs] 
2017-10-02T08:55:31.203+0530: 163376.085: [GC [1 CMS-initial-mark: 7340030K(7340032K)] 10409819K(10806272K), 2.1555220 secs] [Times: user=2.16 sys=0.00, real=2.15 secs] 
2017-10-02T08:55:33.359+0530: 163378.241: [CMS-concurrent-mark-start] 
2017-10-02T08:55:37.571+0530: 163382.453: [CMS-concurrent-mark: 4.205/4.212 secs] [Times: user=12.66 sys=0.02, real=4.22 secs] 
2017-10-02T08:55:37.571+0530: 163382.453: [CMS-concurrent-preclean-start] 
2017-10-02T08:55:37.591+0530: 163382.473: [CMS-concurrent-preclean: 0.020/0.020 secs] [Times: user=0.02 sys=0.00, real=0.02 secs] 
2017-10-02T08:55:37.591+0530: 163382.473: [CMS-concurrent-abortable-preclean-start] 
2017-10-02T08:55:37.591+0530: 163382.473: [CMS-concurrent-abortable-preclean: 0.000/0.000 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
2017-10-02T08:55:37.592+0530: 163382.474: [GC[YG occupancy: 3071464 K (3466240 K)]2017-10-02T08:55:37.592+0530: 163382.474: [Rescan (parallel) , 7.4793360 secs]2017-10-02T08:55:45.071+0530: 163389.953: [weak refs processing, 0.0000660 secs]2017-10-02T08:55:45.071+0530: 163389.953: [scrub string table, 0.0014980 secs] [1 CMS-remark: 7340030K(7340032K)] 10411494K(10806272K), 7.4810960 secs] [Times: user=29.32 sys=0.55, real=7.48 secs] 
2017-10-02T08:55:45.073+0530: 163389.955: [CMS-concurrent-sweep-start] 
2017-10-02T08:55:48.759+0530: 163393.641: [CMS-concurrent-sweep: 3.685/3.686 secs] [Times: user=3.75 sys=0.00, real=3.68 secs] 
2017-10-02T08:55:48.759+0530: 163393.641: [CMS-concurrent-reset-start] 
2017-10-02T08:55:48.774+0530: 163393.656: [CMS-concurrent-reset: 0.015/0.015 secs] [Times: user=0.02 sys=0.00, real=0.02 secs] 
2017-10-02T08:55:50.394+0530: 163395.276: [GC [1 CMS-initial-mark: 7340030K(7340032K)] 10412726K(10806272K), 2.1372650 secs] [Times: user=2.14 sys=0.00, real=2.14 secs] 
2017-10-02T08:55:52.532+0530: 163397.414: [CMS-concurrent-mark-start] 
2017-10-02T08:55:57.099+0530: 163401.981: [CMS-concurrent-mark: 4.562/4.567 secs] [Times: user=13.79 sys=0.03, real=4.56 secs] 
2017-10-02T08:55:57.100+0530: 163401.981: [CMS-concurrent-preclean-start] 
2017-10-02T08:55:57.121+0530: 163402.003: [CMS-concurrent-preclean: 0.021/0.021 secs] [Times: user=0.02 sys=0.00, real=0.03 secs] 
2017-10-02T08:55:57.121+0530: 163402.003: [CMS-concurrent-abortable-preclean-start] 
2017-10-02T08:55:57.121+0530: 163402.003: [CMS-concurrent-abortable-preclean: 0.000/0.000 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
2017-10-02T08:55:57.122+0530: 163402.003: [GC[YG occupancy: 3079753 K (3466240 K)]2017-10-02T08:55:57.122+0530: 163402.003: [Rescan (parallel) , 6.3679960 secs]2017-10-02T08:56:03.490+0530: 163408.371: [weak refs processing, 0.0000530 secs]2017-10-02T08:56:03.490+0530: 163408.372: [scrub string table, 0.0013790 secs] [1 CMS-remark: 7340030K(7340032K)] 10419783K(10806272K), 6.3695720 secs] [Times: user=24.99 sys=0.44, real=6.37 secs] 
2017-10-02T08:56:03.491+0530: 163408.373: [CMS-concurrent-sweep-start] 
2017-10-02T08:56:07.238+0530: 163412.120: [CMS-concurrent-sweep: 3.743/3.746 secs] [Times: user=3.82 sys=0.01, real=3.74 secs] 
2017-10-02T08:56:07.238+0530: 163412.120: [CMS-concurrent-reset-start] 
2017-10-02T08:56:07.253+0530: 163412.135: [CMS-concurrent-reset: 0.015/0.015 secs] [Times: user=0.01 sys=0.00, real=0.02 secs] 
2017-10-02T08:56:07.305+0530: 163412.187: [GC [1 CMS-initial-mark: 7340030K(7340032K)] 10421003K(10806272K), 2.2521140 secs] [Times: user=2.25 sys=0.00, real=2.25 secs] 
2017-10-02T08:56:09.557+0530: 163414.439: [CMS-concurrent-mark-start] 
2017-10-02T08:56:13.791+0530: 163418.673: [CMS-concurrent-mark: 4.228/4.234 secs] [Times: user=12.87 sys=0.03, real=4.24 secs] 
2017-10-02T08:56:13.791+0530: 163418.673: [CMS-concurrent-preclean-start] 
2017-10-02T08:56:13.812+0530: 163418.694: [CMS-concurrent-preclean: 0.020/0.021 secs] [Times: user=0.02 sys=0.01, real=0.02 secs] 
2017-10-02T08:56:13.812+0530: 163418.694: [CMS-concurrent-abortable-preclean-start] 
2017-10-02T08:56:13.812+0530: 163418.694: [CMS-concurrent-abortable-preclean: 0.000/0.000 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
2017-10-02T08:56:13.813+0530: 163418.694: [GC[YG occupancy: 3093202 K (3466240 K)]2017-10-02T08:56:13.813+0530: 163418.695: [Rescan (parallel) , 8.0104730 secs]2017-10-02T08:56:21.823+0530: 163426.705: [weak refs processing, 0.0000520 secs]2017-10-02T08:56:21.823+0530: 163426.705: [scrub string table, 0.0014030 secs] [1 CMS-remark: 7340030K(7340032K)] 10433232K(10806272K), 8.0121360 secs] [Times: user=31.38 sys=0.59, real=8.01 secs] 
2017-10-02T08:56:21.825+0530: 163426.707: [CMS-concurrent-sweep-start] 
2017-10-02T08:56:25.577+0530: 163430.458: [CMS-concurrent-sweep: 3.746/3.752 secs] [Times: user=3.91 sys=0.02, real=3.75 secs] 
2017-10-02T08:56:25.577+0530: 163430.459: [CMS-concurrent-reset-start] 
2017-10-02T08:56:25.592+0530: 163430.474: [CMS-concurrent-reset: 0.016/0.016 secs] [Times: user=0.01 sys=0.01, real=0.02 secs] 
2017-10-02T08:56:26.334+0530: 163431.216: [GC [1 CMS-initial-mark: 7340030K(7340032K)] 10440089K(10806272K), 2.1770880 secs] [Times: user=2.18 sys=0.00, real=2.18 secs] 
2017-10-02T08:56:28.511+0530: 163433.393: [CMS-concurrent-mark-start] 
2017-10-02T08:56:33.019+0530: 163437.900: [CMS-concurrent-mark: 4.502/4.507 secs] [Times: user=13.64 sys=0.01, real=4.50 secs] 
2017-10-02T08:56:33.019+0530: 163437.901: [CMS-concurrent-preclean-start] 
2017-10-02T08:56:33.043+0530: 163437.925: [CMS-concurrent-preclean: 0.023/0.024 secs] [Times: user=0.02 sys=0.00, real=0.03 secs] 
2017-10-02T08:56:33.043+0530: 163437.925: [CMS-concurrent-abortable-preclean-start] 
2017-10-02T08:56:33.043+0530: 163437.925: [CMS-concurrent-abortable-preclean: 0.000/0.000 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
2017-10-02T08:56:33.043+0530: 163437.925: [GC[YG occupancy: 3107362 K (3466240 K)]2017-10-02T08:56:33.043+0530: 163437.925: [Rescan (parallel) , 8.2780770 secs]2017-10-02T08:56:41.322+0530: 163446.203: [weak refs processing, 0.0000520 secs]2017-10-02T08:56:41.322+0530: 163446.204: [scrub string table, 0.0013870 secs] [1 CMS-remark: 7340030K(7340032K)] 10447392K(10806272K), 8.2796480 secs] [Times: user=32.44 sys=0.62, real=8.28 secs] 
2017-10-02T08:56:41.323+0530: 163446.205: [CMS-concurrent-sweep-start] 
2017-10-02T08:56:45.033+0530: 163449.915: [CMS-concurrent-sweep: 3.705/3.710 secs] [Times: user=3.79 sys=0.01, real=3.71 secs] 
2017-10-02T08:56:45.034+0530: 163449.915: [CMS-concurrent-reset-start] 
2017-10-02T08:56:45.049+0530: 163449.931: [CMS-concurrent-reset: 0.015/0.015 secs] [Times: user=0.01 sys=0.00, real=0.01 secs] 
2017-10-02T08:56:45.392+0530: 163450.274: [GC [1 CMS-initial-mark: 7340030K(7340032K)] 10449182K(10806272K), 2.2074740 secs] [Times: user=2.21 sys=0.00, real=2.20 secs] 

のフルGCログはここにある： https://www.dropbox.com/s/keo4i0ss2m60jlk/gc.log.zip?dl=0

システムは16ギガバイトのマシンです。私は何の問題もなく8GBマシンで走っていました。メモリリークを示していますか？

それとも、システムメモリを増やす必要があるのでしょうか？

Answer 1

システムは16 GBマシンです。私は何の問題もなく8GBマシンで走っていました。メモリリークを示していますか？

必ずしもそうであるとは限りません。しかし、それもそれを排除するものではありません。たとえば、コードを変更したか、より大きな「問題」を実行している可能性があります。

あなたはメモリリークの疑いがある場合、あなたはメモリプロファイラを使用してアプリケーションを実行してするようにしてください

「十分でないメモリ」からメモリリークを区別できる明確な証拠が、まっすぐ前方なしありメモリが使用されているかどうかを確認してください。

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それとも、私がシステムメモリを増やす必要があるということだけでしょうか？

問題がメモリリークの場合は、おそらくそれを解決できません。

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第三のオプションは少ないメモリを使用するようにアプリケーションを再設計またはチューニングすることであってもよいです。たとえば、メモリにキャッシュするものがある場合、キャッシュサイズを小さくすると、占有されるメモリが減少します。または、大量のゴミが発生している場合は、それを減らすために何かを再実装することができます。