1
我正在使用最近升級的應用程序，並且看到了我無法解釋的新行爲。收藏的模式看起來很不錯，但是在幾秒鐘內就可以連續完成超過10個G1的疏散集合（年輕）。他們似乎正在清理伊甸園的記憶，但我不明白爲什麼它如此迅速地填滿。快速年輕G1疏散集合
這是一個複雜的問題還是我做錯了什麼？ （如果我發佈了太多細節，我可以編輯並刪除它）。
-XX:+UseG1GC -Xms10240m -Xmx10240m -XX:NewRatio=2 -XX:NewSize=1792m -XX:G1ReservePercent=30 -XX:+AggressiveOpts
GCViewer 如果你看看這張截圖，你可以看到幾乎藍色實線在那裏，年輕代藏品快速連續地發生。
2017-03-02T12:27:08.527-0800: 48187.087: [GC pause (G1 Evacuation Pause) (young)
Desired survivor size 299892736 bytes, new threshold 15 (max 15)
- age 1: 6684488 bytes, 6684488 total
- age 2: 15234432 bytes, 21918920 total
- age 3: 5530024 bytes, 27448944 total
- age 4: 5502152 bytes, 32951096 total
- age 5: 4490976 bytes, 37442072 total
- age 6: 1736456 bytes, 39178528 total
- age 7: 2849184 bytes, 42027712 total
- age 8: 2600504 bytes, 44628216 total
- age 9: 1793032 bytes, 46421248 total
- age 10: 1996752 bytes, 48418000 total
- age 11: 876104 bytes, 49294104 total
- age 12: 2233720 bytes, 51527824 total
- age 13: 1218392 bytes, 52746216 total
- age 14: 903760 bytes, 53649976 total
- age 15: 1774480 bytes, 55424456 total
, 0.0369978 secs]
[Parallel Time: 32.2 ms, GC Workers: 8]
[GC Worker Start (ms): Min: 48187087.1, Avg: 48187087.2, Max: 48187087.3, Diff: 0.2]
[Ext Root Scanning (ms): Min: 4.4, Avg: 6.5, Max: 12.0, Diff: 7.7, Sum: 51.9]
[Update RS (ms): Min: 4.0, Avg: 8.5, Max: 9.6, Diff: 5.6, Sum: 68.3]
[Processed Buffers: Min: 8, Avg: 13.4, Max: 19, Diff: 11, Sum: 107]
[Scan RS (ms): Min: 0.1, Avg: 0.2, Max: 0.3, Diff: 0.2, Sum: 1.9]
[Code Root Scanning (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.1]
[Object Copy (ms): Min: 15.4, Avg: 16.6, Max: 17.8, Diff: 2.4, Sum: 132.5]
[Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
[Termination Attempts: Min: 1, Avg: 1.0, Max: 1, Diff: 0, Sum: 8]
[GC Worker Other (ms): Min: 0.0, Avg: 0.1, Max: 0.2, Diff: 0.1, Sum: 0.8]
[GC Worker Total (ms): Min: 31.9, Avg: 31.9, Max: 32.0, Diff: 0.2, Sum: 255.6]
[GC Worker End (ms): Min: 48187119.1, Avg: 48187119.2, Max: 48187119.3, Diff: 0.1]
[Code Root Fixup: 0.4 ms]
[Code Root Purge: 0.0 ms]
[Clear CT: 0.7 ms]
[Other: 3.7 ms]
[Choose CSet: 0.0 ms]
[Ref Proc: 0.8 ms]
[Ref Enq: 0.0 ms]
[Redirty Cards: 0.2 ms]
[Humongous Register: 0.2 ms]
[Humongous Reclaim: 0.1 ms]
[Free CSet: 1.8 ms]
[Eden: 4508.0M(4508.0M)->0.0B(4516.0M) Survivors: 68.0M->64.0M Heap: 7036.0M(10.0G)->2524.1M(10.0G)]
[Times: user=0.26 sys=0.00, real=0.04 secs]
2017-03-02T12:27:09.078-0800: 48187.638: [GC pause (G1 Evacuation Pause) (young)
Desired survivor size 301989888 bytes, new threshold 15 (max 15)
- age 1: 31144 bytes, 31144 total
- age 2: 6631192 bytes, 6662336 total
- age 3: 15225176 bytes, 21887512 total
- age 4: 5530024 bytes, 27417536 total
- age 5: 5501976 bytes, 32919512 total
- age 6: 4490976 bytes, 37410488 total
- age 7: 1736456 bytes, 39146944 total
- age 8: 2849184 bytes, 41996128 total
- age 9: 2600504 bytes, 44596632 total
- age 10: 1793032 bytes, 46389664 total
- age 11: 1996752 bytes, 48386416 total
- age 12: 876104 bytes, 49262520 total
- age 13: 2233720 bytes, 51496240 total
- age 14: 1218392 bytes, 52714632 total
- age 15: 903760 bytes, 53618392 total
, 0.0320568 secs]
[Parallel Time: 28.0 ms, GC Workers: 8]
[GC Worker Start (ms): Min: 48187638.4, Avg: 48187638.5, Max: 48187638.6, Diff: 0.2]
[Ext Root Scanning (ms): Min: 3.8, Avg: 5.4, Max: 11.2, Diff: 7.4, Sum: 43.4]
[Update RS (ms): Min: 2.4, Avg: 7.4, Max: 8.7, Diff: 6.3, Sum: 59.2]
[Processed Buffers: Min: 7, Avg: 11.6, Max: 15, Diff: 8, Sum: 93]
[Scan RS (ms): Min: 0.2, Avg: 0.2, Max: 0.3, Diff: 0.1, Sum: 1.9]
[Code Root Scanning (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.1]
[Object Copy (ms): Min: 13.6, Avg: 14.6, Max: 15.0, Diff: 1.3, Sum: 116.5]
[Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
[Termination Attempts: Min: 1, Avg: 1.9, Max: 3, Diff: 2, Sum: 15]
[GC Worker Other (ms): Min: 0.0, Avg: 0.1, Max: 0.2, Diff: 0.1, Sum: 0.8]
[GC Worker Total (ms): Min: 27.6, Avg: 27.7, Max: 27.8, Diff: 0.3, Sum: 221.9]
[GC Worker End (ms): Min: 48187666.2, Avg: 48187666.3, Max: 48187666.3, Diff: 0.1]
[Code Root Fixup: 0.3 ms]
[Code Root Purge: 0.0 ms]
[Clear CT: 0.7 ms]
[Other: 3.0 ms]
[Choose CSet: 0.0 ms]
[Ref Proc: 0.5 ms]
[Ref Enq: 0.0 ms]
[Redirty Cards: 0.2 ms]
[Humongous Register: 0.2 ms]
[Humongous Reclaim: 0.1 ms]
[Free CSet: 1.6 ms]
[Eden: 4516.0M(4516.0M)->0.0B(4520.0M) Survivors: 64.0M->60.0M Heap: 7040.1M(10.0G)->2521.7M(10.0G)]
[Times: user=0.23 sys=0.00, real=0.03 secs]
2017-03-02T12:27:09.618-0800: 48188.179: [GC pause (G1 Evacuation Pause) (young)
Desired survivor size 301989888 bytes, new threshold 15 (max 15)
- age 1: 47960 bytes, 47960 total
- age 2: 26736 bytes, 74696 total
- age 3: 6628208 bytes, 6702904 total
- age 4: 15151304 bytes, 21854208 total
- age 5: 5530024 bytes, 27384232 total
- age 6: 5501976 bytes, 32886208 total
- age 7: 4490976 bytes, 37377184 total
- age 8: 1736456 bytes, 39113640 total
- age 9: 2849184 bytes, 41962824 total
- age 10: 2600504 bytes, 44563328 total
- age 11: 1792992 bytes, 46356320 total
- age 12: 1996752 bytes, 48353072 total
- age 13: 876104 bytes, 49229176 total
- age 14: 2233720 bytes, 51462896 total
- age 15: 1218392 bytes, 52681288 total
, 0.0347669 secs]
[Parallel Time: 30.5 ms, GC Workers: 8]
[GC Worker Start (ms): Min: 48188179.0, Avg: 48188179.0, Max: 48188179.1, Diff: 0.1]
[Ext Root Scanning (ms): Min: 4.0, Avg: 6.2, Max: 14.5, Diff: 10.5, Sum: 49.9]
[Update RS (ms): Min: 0.7, Avg: 8.2, Max: 10.1, Diff: 9.4, Sum: 65.9]
[Processed Buffers: Min: 6, Avg: 12.5, Max: 22, Diff: 16, Sum: 100]
[Scan RS (ms): Min: 0.1, Avg: 0.2, Max: 0.3, Diff: 0.2, Sum: 1.9]
[Code Root Scanning (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.1]
[Object Copy (ms): Min: 14.4, Avg: 15.4, Max: 15.8, Diff: 1.4, Sum: 123.1]
[Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
[Termination Attempts: Min: 1, Avg: 1.6, Max: 3, Diff: 2, Sum: 13]
[GC Worker Other (ms): Min: 0.0, Avg: 0.1, Max: 0.2, Diff: 0.2, Sum: 0.9]
[GC Worker Total (ms): Min: 30.2, Avg: 30.2, Max: 30.3, Diff: 0.1, Sum: 241.8]
[GC Worker End (ms): Min: 48188209.2, Avg: 48188209.3, Max: 48188209.3, Diff: 0.2]
[Code Root Fixup: 0.3 ms]
[Code Root Purge: 0.0 ms]
[Clear CT: 0.7 ms]
[Other: 3.3 ms]
[Choose CSet: 0.0 ms]
[Ref Proc: 0.6 ms]
[Ref Enq: 0.0 ms]
[Redirty Cards: 0.4 ms]
[Humongous Register: 0.2 ms]
[Humongous Reclaim: 0.1 ms]
[Free CSet: 1.5 ms]
[Eden: 4520.0M(4520.0M)->0.0B(4520.0M) Survivors: 60.0M->60.0M Heap: 7041.7M(10.0G)->2525.3M(10.0G)]
[Times: user=0.24 sys=0.00, real=0.03 secs]
2017-03-02T12:27:10.264-0800: 48188.825: [GC pause (G1 Evacuation Pause) (young)
Desired survivor size 301989888 bytes, new threshold 15 (max 15)
- age 1: 48824 bytes, 48824 total
- age 2: 18672 bytes, 67496 total
- age 3: 17312 bytes, 84808 total
- age 4: 6627608 bytes, 6712416 total
- age 5: 15149168 bytes, 21861584 total
- age 6: 5530024 bytes, 27391608 total
- age 7: 5501976 bytes, 32893584 total
- age 8: 4490848 bytes, 37384432 total
- age 9: 1736456 bytes, 39120888 total
- age 10: 2849184 bytes, 41970072 total
- age 11: 2600504 bytes, 44570576 total
- age 12: 1792992 bytes, 46363568 total
- age 13: 1996752 bytes, 48360320 total
- age 14: 876104 bytes, 49236424 total
- age 15: 2233720 bytes, 51470144 total
, 0.0343310 secs]
[Parallel Time: 28.8 ms, GC Workers: 8]
[GC Worker Start (ms): Min: 48188825.2, Avg: 48188825.3, Max: 48188825.5, Diff: 0.3]
[Ext Root Scanning (ms): Min: 3.9, Avg: 5.9, Max: 12.0, Diff: 8.1, Sum: 47.5]
[Update RS (ms): Min: 2.9, Avg: 8.0, Max: 9.3, Diff: 6.3, Sum: 63.6]
[Processed Buffers: Min: 8, Avg: 11.8, Max: 21, Diff: 13, Sum: 94]
[Scan RS (ms): Min: 0.1, Avg: 0.3, Max: 0.4, Diff: 0.3, Sum: 2.3]
[Code Root Scanning (ms): Min: 0.0, Avg: 0.0, Max: 0.1, Diff: 0.0, Sum: 0.1]
[Object Copy (ms): Min: 13.0, Avg: 14.2, Max: 14.9, Diff: 1.9, Sum: 113.3]
[Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
[Termination Attempts: Min: 1, Avg: 1.5, Max: 2, Diff: 1, Sum: 12]
[GC Worker Other (ms): Min: 0.0, Avg: 0.1, Max: 0.2, Diff: 0.1, Sum: 0.7]
[GC Worker Total (ms): Min: 28.3, Avg: 28.4, Max: 28.6, Diff: 0.4, Sum: 227.5]
[GC Worker End (ms): Min: 48188853.7, Avg: 48188853.8, Max: 48188853.8, Diff: 0.1]
[Code Root Fixup: 0.4 ms]
[Code Root Purge: 0.0 ms]
[Clear CT: 0.6 ms]
[Other: 4.5 ms]
[Choose CSet: 0.0 ms]
[Ref Proc: 1.7 ms]
[Ref Enq: 0.1 ms]
[Redirty Cards: 0.3 ms]
[Humongous Register: 0.3 ms]
[Humongous Reclaim: 0.1 ms]
[Free CSet: 1.7 ms]
[Eden: 4520.0M(4520.0M)->0.0B(4524.0M) Survivors: 60.0M->56.0M Heap: 7045.3M(10.0G)->2522.1M(10.0G)]
[Times: user=0.23 sys=0.00, real=0.03 secs]
2017-03-02T12:27:10.866-0800: 48189.426: [GC pause (G1 Evacuation Pause) (young)
Desired survivor size 301989888 bytes, new threshold 15 (max 15)
- age 1: 579088 bytes, 579088 total
- age 2: 9904 bytes, 588992 total
- age 3: 18376 bytes, 607368 total
- age 4: 14720 bytes, 622088 total
- age 5: 6624344 bytes, 7246432 total
- age 6: 11726288 bytes, 18972720 total
- age 7: 5529984 bytes, 24502704 total
- age 8: 5492072 bytes, 29994776 total
- age 9: 4482976 bytes, 34477752 total
- age 10: 1736360 bytes, 36214112 total
- age 11: 2848368 bytes, 39062480 total
- age 12: 2600504 bytes, 41662984 total
- age 13: 1792992 bytes, 43455976 total
- age 14: 1996752 bytes, 45452728 total
- age 15: 876104 bytes, 46328832 total
, 0.0350574 secs]
[Parallel Time: 29.2 ms, GC Workers: 8]
[GC Worker Start (ms): Min: 48189427.4, Avg: 48189427.5, Max: 48189427.6, Diff: 0.2]
[Ext Root Scanning (ms): Min: 4.0, Avg: 5.8, Max: 11.5, Diff: 7.5, Sum: 46.0]
[Update RS (ms): Min: 3.3, Avg: 8.2, Max: 9.6, Diff: 6.3, Sum: 65.8]
[Processed Buffers: Min: 7, Avg: 13.0, Max: 22, Diff: 15, Sum: 104]
[Scan RS (ms): Min: 0.1, Avg: 0.2, Max: 0.3, Diff: 0.2, Sum: 1.9]
[Code Root Scanning (ms): Min: 0.0, Avg: 0.0, Max: 0.1, Diff: 0.1, Sum: 0.1]
[Object Copy (ms): Min: 13.2, Avg: 14.4, Max: 14.9, Diff: 1.7, Sum: 114.8]
[Termination (ms): Min: 0.0, Avg: 0.3, Max: 0.3, Diff: 0.3, Sum: 2.1]
[Termination Attempts: Min: 1, Avg: 3.8, Max: 7, Diff: 6, Sum: 30]
[GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.1, Diff: 0.1, Sum: 0.4]
[GC Worker Total (ms): Min: 28.8, Avg: 28.9, Max: 29.0, Diff: 0.2, Sum: 231.1]
[GC Worker End (ms): Min: 48189456.4, Avg: 48189456.4, Max: 48189456.4, Diff: 0.1]
[Code Root Fixup: 0.3 ms]
[Code Root Purge: 0.0 ms]
[Clear CT: 0.7 ms]
[Other: 4.8 ms]
[Choose CSet: 0.0 ms]
[Ref Proc: 1.4 ms]
[Ref Enq: 0.2 ms]
[Redirty Cards: 0.3 ms]
[Humongous Register: 0.9 ms]
[Humongous Reclaim: 0.1 ms]
[Free CSet: 1.5 ms]
[Eden: 4524.0M(4524.0M)->0.0B(4524.0M) Survivors: 56.0M->56.0M Heap: 7046.1M(10.0G)->2525.3M(10.0G)]
[Times: user=0.24 sys=0.00, real=0.03 secs]
2017-03-02T12:27:11.515-0800: 48190.075: [GC pause (G1 Evacuation Pause) (young)
Desired survivor size 301989888 bytes, new threshold 15 (max 15)
- age 1: 827320 bytes, 827320 total
- age 2: 16496 bytes, 843816 total
- age 3: 2352 bytes, 846168 total
- age 4: 18176 bytes, 864344 total
- age 5: 14528 bytes, 878872 total
- age 6: 6577816 bytes, 7456688 total
- age 7: 11698856 bytes, 19155544 total
- age 8: 5520560 bytes, 24676104 total
- age 9: 5492032 bytes, 30168136 total
- age 10: 4482976 bytes, 34651112 total
- age 11: 1736360 bytes, 36387472 total
- age 12: 2848368 bytes, 39235840 total
- age 13: 2600504 bytes, 41836344 total
- age 14: 1792992 bytes, 43629336 total
- age 15: 1996752 bytes, 45626088 total
, 0.0353327 secs]
[Parallel Time: 28.5 ms, GC Workers: 8]
[GC Worker Start (ms): Min: 48190075.8, Avg: 48190075.9, Max: 48190076.1, Diff: 0.3]
[Ext Root Scanning (ms): Min: 3.3, Avg: 6.0, Max: 11.7, Diff: 8.4, Sum: 47.7]
[Update RS (ms): Min: 3.1, Avg: 7.5, Max: 8.7, Diff: 5.6, Sum: 60.4]
[Processed Buffers: Min: 6, Avg: 13.0, Max: 23, Diff: 17, Sum: 104]
[Scan RS (ms): Min: 0.1, Avg: 0.2, Max: 0.3, Diff: 0.2, Sum: 1.9]
[Code Root Scanning (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.1]
[Object Copy (ms): Min: 12.8, Avg: 14.0, Max: 14.7, Diff: 1.9, Sum: 111.8]
[Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
[Termination Attempts: Min: 1, Avg: 1.4, Max: 2, Diff: 1, Sum: 11]
[GC Worker Other (ms): Min: 0.0, Avg: 0.4, Max: 2.1, Diff: 2.1, Sum: 2.9]
[GC Worker Total (ms): Min: 28.0, Avg: 28.1, Max: 28.2, Diff: 0.3, Sum: 224.8]
[GC Worker End (ms): Min: 48190103.9, Avg: 48190104.0, Max: 48190104.1, Diff: 0.2]
[Code Root Fixup: 0.4 ms]
[Code Root Purge: 0.0 ms]
[Clear CT: 0.7 ms]
[Other: 5.7 ms]
[Choose CSet: 0.0 ms]
[Ref Proc: 2.6 ms]
[Ref Enq: 0.0 ms]
[Redirty Cards: 0.3 ms]
[Humongous Register: 0.2 ms]
[Humongous Reclaim: 0.1 ms]
[Free CSet: 1.9 ms]
[Eden: 4524.0M(4524.0M)->0.0B(4512.0M) Survivors: 56.0M->60.0M Heap: 7049.3M(10.0G)->2529.7M(10.0G)]
[Times: user=0.23 sys=0.00, real=0.04 secs]
謝謝你的期待。我相信是的，應用程序非常突兀。最終，我發現我是數據庫綁定的（沒有足夠的連接允許tomcat應用程序）。這不是垃圾收集問題。 –