[英]How to see the total memory usage of this GC in Java
我正在嘗試查看應為進程分配多少內存。 這就是我啟動應用程序的方式。
'-server -Xmx10G -XX:+UseG1GC -XX:MaxGCPauseMillis=100 -XX:+PrintGCDetails -XX:+PrintGCTimeStamps'
所以,我給應用程序10G。 但是我想知道它真正使用了多少。 那可能嗎? 我有此垃圾收集器日志。
5997.472: [GC pause (young), 0.0195390 secs]
[Parallel Time: 9.6 ms, GC Workers: 8]
[GC Worker Start (ms): Min: 5997472.0, Avg: 5997476.1, Max: 5997480.9, Diff: 8.9]
[Ext Root Scanning (ms): Min: 0.0, Avg: 2.7, Max: 6.4, Diff: 6.4, Sum: 21.3]
[Update RS (ms): Min: 0.0, Avg: 0.1, Max: 0.2, Diff: 0.2, Sum: 0.5]
[Processed Buffers: Min: 0, Avg: 4.6, Max: 13, Diff: 13, Sum: 37]
[Scan RS (ms): Min: 0.3, Avg: 1.5, Max: 1.9, Diff: 1.6, Sum: 11.8]
[Code Root Scanning (ms): Min: 0.0, Avg: 0.2, Max: 0.3, Diff: 0.3, Sum: 1.6]
[Object Copy (ms): Min: 0.0, Avg: 0.3, Max: 0.8, Diff: 0.8, Sum: 2.5]
[Termination (ms): Min: 0.0, Avg: 0.4, Max: 0.5, Diff: 0.5, Sum: 3.5]
[GC Worker Other (ms): Min: 0.0, Avg: 0.1, Max: 0.2, Diff: 0.2, Sum: 0.7]
[GC Worker Total (ms): Min: 0.4, Avg: 5.2, Max: 9.4, Diff: 9.1, Sum: 41.7]
[GC Worker End (ms): Min: 5997481.3, Avg: 5997481.3, Max: 5997481.4, Diff: 0.2]
[Code Root Fixup: 0.1 ms]
[Code Root Migration: 0.6 ms]
[Clear CT: 1.1 ms]
[Other: 8.2 ms]
[Choose CSet: 0.0 ms]
[Ref Proc: 0.4 ms]
[Ref Enq: 0.0 ms]
[Free CSet: 7.7 ms]
[Eden: 5433.0M(5433.0M)->0.0B(5433.0M) Survivors: 1024.0K->1024.0K Heap: 9008.4M(10192.0M)->3575.4M(10192.0M)]
[Times: user=0.06 sys=0.01, real=0.02 secs]
6002.843: [GC pause (young), 0.0732310 secs]
[Parallel Time: 34.1 ms, GC Workers: 8]
[GC Worker Start (ms): Min: 6002843.5, Avg: 6002854.0, Max: 6002862.0, Diff: 18.5]
[Ext Root Scanning (ms): Min: 0.0, Avg: 5.3, Max: 23.1, Diff: 23.1, Sum: 42.6]
[Update RS (ms): Min: 0.0, Avg: 0.3, Max: 1.4, Diff: 1.4, Sum: 2.6]
[Processed Buffers: Min: 0, Avg: 6.2, Max: 27, Diff: 27, Sum: 50]
[Scan RS (ms): Min: 0.5, Avg: 2.5, Max: 5.1, Diff: 4.6, Sum: 20.0]
[Code Root Scanning (ms): Min: 0.0, Avg: 0.2, Max: 0.5, Diff: 0.5, Sum: 1.8]
[Object Copy (ms): Min: 0.0, Avg: 1.6, Max: 10.2, Diff: 10.2, Sum: 12.4]
[Termination (ms): Min: 0.0, Avg: 6.5, Max: 8.7, Diff: 8.7, Sum: 51.9]
[GC Worker Other (ms): Min: 0.0, Avg: 1.5, Max: 3.0, Diff: 2.9, Sum: 11.9]
[GC Worker Total (ms): Min: 8.5, Avg: 17.9, Max: 29.8, Diff: 21.3, Sum: 143.2]
[GC Worker End (ms): Min: 6002870.4, Avg: 6002871.9, Max: 6002873.3, Diff: 2.9]
[Code Root Fixup: 0.1 ms]
[Code Root Migration: 1.1 ms]
[Clear CT: 2.4 ms]
[Other: 35.6 ms]
[Choose CSet: 0.0 ms]
[Ref Proc: 18.4 ms]
[Ref Enq: 0.0 ms]
[Free CSet: 16.9 ms]
[Eden: 5433.0M(5433.0M)->0.0B(5430.0M) Survivors: 1024.0K->1024.0K Heap: 9010.7M(10192.0M)->3577.9M(10192.0M)]
[Times: user=0.13 sys=0.01, real=0.07 secs]
Heap
garbage-first heap total 10436608K, used 6181542K [0x0000000575a00000, 0x00000007f2a00000, 0x00000007f5a00000)
region size 1024K, 2460 young (2519040K), 1 survivors (1024K)
compacting perm gen total 52224K, used 51927K [0x00000007f5a00000, 0x00000007f8d00000, 0x0000000800000000)
the space 52224K, 99% used [0x00000007f5a00000, 0x00000007f8cb5e30, 0x00000007f8cb6000, 0x00000007f8d00000)
No shared spaces configured.
那是應用程序停止運行之前的最后一個日志(該過程已完成)。 當我在機器上使用top
命令時,我總是看到10G的進程,我猜這就是Xmx
選項的效果。 但是,如果我知道它實際使用了多少,則可以調整並降低它。 因此,我將為其他進程留出更多空間。 如果您要查看其他日志,請告訴我。
就在這里: total 10436608K, used 6181542K
。 因此,在此行的時候,您的應用程序使用了大約6G的堆
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