我正在使用G1GC,jdk 1.7

Java HotSpot(TM) 64-Bit Server VM (24.79-b02) for linux-amd64 JRE (1.7.0_79-b15), built on Apr 10 2015 11:34:48 by "java_re" with gcc 4.3.0 20080428 (Red Hat 4.3.0-8)

Memory: 4k page, physical 32826020k(12590436k free), swap 33431548k(33358800k free)

CommandLine flags: -XX:AutoBoxCacheMax=3000000 -XX:+DisableExplicitGC

-XX:G1NewSizePercent=20 -XX:+HeapDumpOnOutOfMemoryError -XX:InitialHeapSize=10737418240

-XX:InitiatingHeapOccupancyPercent=70 -XX:MaxDirectMemorySize=1073741824 -XX:MaxGCPauseMillis=1000

-XX:MaxHeapSize=10737418240

-XX:-OmitStackTraceInFastThrow -XX:+PrintGC -XX:+PrintGCApplicationStoppedTime -XX:+PrintGCDetails

-XX:+PrintGCTimeStamps -XX:+UnlockExperimentalVMOptions

-XX:+UseCompressedOops -XX:+UseG1GC

大多數小型GC工作正常,但它仍然開始不尋常的fullGC,大約一小時一到兩次.

這是年輕GC日志的正常情況

3443.100: [GC pause (young), 0.3021260 secs]

[Parallel Time: 277.6 ms, GC Workers: 4]

[GC Worker Start (ms): Min: 3443100.5, Avg: 3443100.6, Max: 3443100.6, Diff: 0.1]

[Ext Root Scanning (ms): Min: 2.9, Avg: 3.0, Max: 3.1, Diff: 0.2, Sum: 11.9]

[Update RS (ms): Min: 33.5, Avg: 33.6, Max: 33.9, Diff: 0.4, Sum: 134.5]

[Processed Buffers: Min: 180, Avg: 204.8, Max: 227, Diff: 47, Sum: 819]

[Scan RS (ms): Min: 76.0, Avg: 76.2, Max: 76.3, Diff: 0.3, Sum: 304.9]

[Code Root Scanning (ms): Min: 0.0, Avg: 0.1, Max: 0.1, Diff: 0.1, Sum: 0.3]

[Object Copy (ms): Min: 164.4, Avg: 164.4, Max: 164.5, Diff: 0.1, Sum: 657.7]

[Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]

[GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.1, Diff: 0.0, Sum: 0.2]

[GC Worker Total (ms): Min: 277.3, Avg: 277.4, Max: 277.4, Diff: 0.1, Sum: 1109.5]

[GC Worker End (ms): Min: 3443377.9, Avg: 3443378.0, Max: 3443378.0, Diff: 0.0]

[Code Root Fixup: 0.2 ms]

[Code Root Migration: 0.3 ms]

[Clear CT: 2.0 ms]

[Other: 22.1 ms]

[Choose CSet: 0.0 ms]

[Ref Proc: 15.7 ms]

[Ref Enq: 0.5 ms]

[Free CSet: 3.2 ms]

[Eden: 5996.0M(5996.0M)->0.0B(5648.0M) Survivors: 148.0M->196.0M Heap: 8934.5M(10.0G)->2997.2M(10.0G)]

[Times: user=1.13 sys=0.00, real=0.30 secs]

這是fullGC之前的一個不尋常的GC日志.

它重復了兩到三次,并沒有清理任何記憶.

3482.422: [GC pause (young) (to-space exhausted), 3.4878580 secs]

[Parallel Time: 1640.5 ms, GC Workers: 4]

[GC Worker Start (ms): Min: 3482421.8, Avg: 3482422.4, Max: 3482424.0, Diff: 2.2]

[Ext Root Scanning (ms): Min: 2.1, Avg: 3.2, Max: 3.8, Diff: 1.7, Sum: 12.6]

[Update RS (ms): Min: 104.8, Avg: 105.2, Max: 105.6, Diff: 0.8, Sum: 421.0]

[Processed Buffers: Min: 201, Avg: 221.2, Max: 236, Diff: 35, Sum: 885]

[Scan RS (ms): Min: 75.1, Avg: 75.2, Max: 75.3, Diff: 0.1, Sum: 300.8]

[Code Root Scanning (ms): Min: 0.0, Avg: 0.1, Max: 0.1, Diff: 0.1, Sum: 0.2]

[Object Copy (ms): Min: 1455.9, Avg: 1456.1, Max: 1456.2, Diff: 0.3, Sum: 5824.2]

[Termination (ms): Min: 0.0, Avg: 0.1, Max: 0.2, Diff: 0.2, Sum: 0.4]

[GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.1]

[GC Worker Total (ms): Min: 1638.2, Avg: 1639.8, Max: 1640.4, Diff: 2.2, Sum: 6559.3]

[GC Worker End (ms): Min: 3484062.2, Avg: 3484062.2, Max: 3484062.2, Diff: 0.0]

[Code Root Fixup: 0.2 ms]

[Code Root Migration: 0.5 ms]

[Clear CT: 2.0 ms]

[Other: 1844.7 ms]

[Choose CSet: 0.0 ms]

[Ref Proc: 60.1 ms]

[Ref Enq: 0.5 ms]

[Free CSet: 1.2 ms]

[Eden: 5648.0M(5648.0M)->0.0B(1876.0M) Survivors: 196.0M->172.0M Heap: 9441.9M(10.0G)->9352.3M(10.0G)]

[Times: user=9.29 sys=0.05, real=3.49 secs]

然后它開始了一個fullGC

3490.812: [Full GC 9626M->1879M(10G), 7.6059670 secs]

[Eden: 0.0B(2048.0M)->0.0B(6144.0M) Survivors: 0.0B->0.0B Heap: 9626.3M(10.0G)->1879.5M(10.0G)], [Perm: 33901K->33901K(36864K)]

[Times: user=10.24 sys=0.00, real=7.61 secs]

為什么最后一個youngGC沒有清理任何內存？

總結

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