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JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具

时间：2022-10-05 21:43:20浏览次数：69  
标签：Min 0.0 回收 secs 垃圾 ms Diff 日志 Avg


文章目录

1.垃圾回收发生的时机

GC是由JVM自动完成的，根据JVM系统环境而定，所以时机是不确定的。
当然，我们可以手动进行垃圾回收， 比如调用System.gc()方法通知JVM进行一次垃圾回收，但是具体什么时刻运行也无法控制。
也就是说System.gc()只是通知要回收，什么时候回收由JVM决定。 
因为对于垃圾回收来讲，JVM内部是如果一个队列似得去以此执行；手动加入的gc，只会依次放入队列中等待执行;

2.通过Parallel垃圾回收器收集

2.1.配置 -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -Xloggc:gc.log

-XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps
-Xloggc:gc.log

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_垃圾回收

2.2.启动项目

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_java_02

2.3.自动生成日志文件 gc.log

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_sed_03


gc.log

Java HotSpot(TM) 64-Bit Server VM (25.211-b12) for bsd-amd64 JRE (1.8.0_211-b12), built on Apr  1 2019 20:53:18 by "java_re" with gcc 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)
Memory: 4k page, physical 8388608k(174040k free)

/proc/meminfo:

CommandLine flags: -XX:InitialHeapSize=134217728 -XX:MaxHeapSize=2147483648 -XX:+PrintGC -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseParallelGC 
2020-03-14T08:32:26.220-0800: 0.884: [GC (Allocation Failure) [PSYoungGen: 33280K->3822K(38400K)] 33280K->3830K(125952K), 0.0043770 secs] [Times: user=0.01 sys=0.00, real=0.00 secs] 
2020-03-14T08:32:26.470-0800: 1.135: [GC (Allocation Failure) [PSYoungGen: 37102K->5028K(38400K)] 37110K->5044K(125952K), 0.0048521 secs] [Times: user=0.01 sys=0.00, real=0.00 secs] 
2020-03-14T08:32:26.710-0800: 1.374: [GC (Allocation Failure) [PSYoungGen: 38308K->5112K(38400K)] 38324K->5861K(125952K), 0.0074627 secs] [Times: user=0.02 sys=0.00, real=0.00 secs] 
2020-03-14T08:32:27.181-0800: 1.845: [GC (Allocation Failure) [PSYoungGen: 38392K->5096K(71680K)] 39141K->8255K(159232K), 0.0190034 secs] [Times: user=0.03 sys=0.01, real=0.02 secs] 
2020-03-14T08:32:27.443-0800: 2.108: [GC (Metadata GC Threshold) [PSYoungGen: 23268K->5113K(71680K)] 26427K->9006K(159232K), 0.0071650 secs] [Times: user=0.01 sys=0.00, real=0.01 secs] 
2020-03-14T08:32:27.451-0800: 2.115: [Full GC (Metadata GC Threshold) [PSYoungGen: 5113K->0K(71680K)] [ParOldGen: 3893K->5659K(55808K)] 9006K->5659K(127488K), [Metaspace: 20664K->20664K(1067008K)], 0.0371110 secs] [Times: user=0.07 sys=0.01, real=0.03 secs] 
2020-03-14T08:32:29.006-0800: 3.670: [GC (Allocation Failure) [PSYoungGen: 66560K->6982K(109056K)] 72219K->12649K(164864K), 0.0106451 secs] [Times: user=0.02 sys=0.01, real=0.01 secs]

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_java_04

备注说明

[GC (Allocation Failure) [PSYoungGen: 37102K->5028K(38400K)] 37110K->5044K(125952K)
[PSYoungGen: 37102K->5028K(38400K)]:Young区大小本来37102K，回收后变为5028K，38400K为Young区总的大小
37110K->5044K(125952K)这个是总的堆内存的大小，7可以认为5044K-5028K就是old区回收的大小

3.通过CMS垃圾回收器收集

3.1.配置

-XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -XX:+UseConcMarkSweepGC -Xloggc:cms-gc.log

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_sed_05

3.2.运行启动项目,生成日志

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_java_06

3.3.分析日志 cms-gc.log

Java HotSpot(TM) 64-Bit Server VM (25.211-b12) for bsd-amd64 JRE (1.8.0_211-b12), built on Apr  1 2019 20:53:18 by "java_re" with gcc 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)
Memory: 4k page, physical 8388608k(264660k free)

/proc/meminfo:

CommandLine flags: -XX:InitialHeapSize=134217728 -XX:MaxHeapSize=2147483648 -XX:MaxNewSize=348966912 -XX:MaxTenuringThreshold=6 -XX:OldPLABSize=16 -XX:+PrintGC -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseConcMarkSweepGC -XX:+UseParNewGC 
2020-03-14T10:25:39.460-0800: 1.053: [GC (GCLocker Initiated GC) 2020-03-14T10:25:39.460-0800: 1.053: [ParNew: 34953K->3809K(39296K), 0.0051675 secs] 34953K->3809K(126720K), 0.0052943 secs] [Times: user=0.01 sys=0.00, real=0.00 secs] 
2020-03-14T10:25:39.725-0800: 1.317: [GC (Allocation Failure) 2020-03-14T10:25:39.725-0800: 1.317: [ParNew: 38753K->3955K(39296K), 0.0106454 secs] 38753K->5899K(126720K), 0.0107201 secs] [Times: user=0.03 sys=0.01, real=0.01 secs] 
2020-03-14T10:25:39.997-0800: 1.590: [GC (Allocation Failure) 2020-03-14T10:25:39.997-0800: 1.590: [ParNew: 38899K->3445K(39296K), 0.0182829 secs] 40843K->6294K(126720K), 0.0183968 secs] [Times: user=0.03 sys=0.00, real=0.02 secs] 
2020-03-14T10:25:40.522-0800: 2.115: [GC (Allocation Failure) 2020-03-14T10:25:40.522-0800: 2.115: [ParNew: 38395K->4351K(39296K), 0.0060979 secs] 41244K->8409K(126720K), 0.0062010 secs] [Times: user=0.02 sys=0.01, real=0.00 secs] 
2020-03-14T10:25:40.529-0800: 2.121: [GC (GCLocker Initiated GC) 2020-03-14T10:25:40.529-0800: 2.121: [ParNew: 4765K->235K(39296K), 0.0074328 secs] 8822K->7931K(126720K), 0.0075261 secs] [Times: user=0.01 sys=0.00, real=0.01 secs] 
2020-03-14T10:25:41.082-0800: 2.675: [GC (Allocation Failure) 2020-03-14T10:25:41.082-0800: 2.675: [ParNew: 35179K->3399K(39296K), 0.0038822 secs] 42875K->11095K(126720K), 0.0039835 secs] [Times: user=0.02 sys=0.01, real=0.00 secs] 
2020-03-14T10:25:41.087-0800: 2.679: [GC (CMS Initial Mark) [1 CMS-initial-mark: 7696K(87424K)] 11097K(126720K), 0.0008137 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
2020-03-14T10:25:41.087-0800: 2.680: [CMS-concurrent-mark-start]
2020-03-14T10:25:41.119-0800: 2.711: [CMS-concurrent-mark: 0.031/0.031 secs] [Times: user=0.08 sys=0.01, real=0.03 secs] 
2020-03-14T10:25:41.119-0800: 2.711: [CMS-concurrent-preclean-start]
2020-03-14T10:25:41.120-0800: 2.712: [CMS-concurrent-preclean: 0.001/0.001 secs] [Times: user=0.00 sys=0.00, real=0.01 secs] 
2020-03-14T10:25:41.120-0800: 2.712: [CMS-concurrent-abortable-preclean-start]
2020-03-14T10:25:41.396-0800: 2.989: [CMS-concurrent-abortable-preclean: 0.108/0.276 secs] [Times: user=0.60 sys=0.02, real=0.27 secs] 
2020-03-14T10:25:41.398-0800: 2.991: [GC (CMS Final Remark) [YG occupancy: 21379 K (39296 K)]2020-03-14T10:25:41.398-0800: 2.991: [Rescan (parallel) , 0.0033918 secs]2020-03-14T10:25:41.402-0800: 2.994: [weak refs processing, 0.0004793 secs]2020-03-14T10:25:41.402-0800: 2.995: [class unloading, 0.0062217 secs]2020-03-14T10:25:41.408-0800: 3.001: [scrub symbol table, 0.0102398 secs]2020-03-14T10:25:41.419-0800: 3.011: [scrub string table, 0.0003664 secs][1 CMS-remark: 7696K(87424K)] 29075K(126720K), 0.0215389 secs] [Times: user=0.04 sys=0.00, real=0.03 secs] 
2020-03-14T10:25:41.420-0800: 3.012: [CMS-concurrent-sweep-start]
2020-03-14T10:25:41.423-0800: 3.015: [CMS-concurrent-sweep: 0.003/0.003 secs] [Times: user=0.00 sys=0.00, real=0.00 secs] 
2020-03-14T10:25:41.423-0800: 3.015: [CMS-concurrent-reset-start]
2020-03-14T10:25:41.426-0800: 3.018: [CMS-concurrent-reset: 0.003/0.003 secs] [Times: user=0.01 sys=0.00, real=0.00 secs] 
2020-03-14T10:25:41.884-0800: 3.476: [GC (Allocation Failure) 2020-03-14T10:25:41.884-0800: 3.476: [ParNew: 38343K->3951K(39296K), 0.0062215 secs] 42579K->9828K(126720K), 0.0063352 secs] [Times: user=0.02 sys=0.00, real=0.01 secs] 
2020-03-14T10:25:42.633-0800: 4.225: [GC (Allocation Failure) 2020-03-14T10:25:42.633-0800: 4.225: [ParNew: 38895K->4351K(39296K), 0.0058392 secs] 44772K->12144K(126720K), 0.0059428 secs] [Times: user=0.02 sys=0.00, real=0.00 secs] 
2020-03-14T10:25:43.338-0800: 4.931: [GC (Allocation Failure) 2020-03-14T10:25:43.338-0800: 4.931: [ParNew: 39295K->4352K(39296K), 0.0085009 secs] 47088K->14287K(126720K), 0.0085831 secs] [Times: user=0.03 sys=0.00, real=0.01 secs]

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_java_07

4.通过G1垃圾回收器收集

4.1.配置

-XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+PrintGCDateStamps -XX:+UseG1GC -Xloggc:g1-gc.log

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_sed_08

4.2.分析日志 g1-gc.log

Java HotSpot(TM) 64-Bit Server VM (25.211-b12) for bsd-amd64 JRE (1.8.0_211-b12), built on Apr  1 2019 20:53:18 by "java_re" with gcc 4.2.1 (Based on Apple Inc. build 5658) (LLVM build 2336.11.00)
Memory: 4k page, physical 8388608k(528884k free)

/proc/meminfo:

CommandLine flags: -XX:InitialHeapSize=134217728 -XX:MaxHeapSize=2147483648 -XX:+PrintGC -XX:+PrintGCDateStamps -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -XX:+UseCompressedClassPointers -XX:+UseCompressedOops -XX:+UseG1GC 
2020-03-14T10:39:06.633-0800: 0.638: [GC pause (G1 Evacuation Pause) (young), 0.0029785 secs]
   [Parallel Time: 2.0 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 638.5, Avg: 638.5, Max: 638.5, Diff: 0.0]
      [Ext Root Scanning (ms): Min: 0.1, Avg: 0.5, Max: 0.9, Diff: 0.8, Sum: 2.1]
      [Update RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
         [Processed Buffers: Min: 0, Avg: 0.0, Max: 0, Diff: 0, Sum: 0]
      [Scan RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Code Root Scanning (ms): Min: 0.0, Avg: 0.3, Max: 0.8, Diff: 0.8, Sum: 1.2]
      [Object Copy (ms): Min: 0.6, Avg: 1.1, Max: 1.5, Diff: 0.9, Sum: 4.5]
      [Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
         [Termination Attempts: Min: 1, Avg: 2.5, Max: 5, Diff: 4, Sum: 10]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.1]
      [GC Worker Total (ms): Min: 1.9, Avg: 2.0, Max: 2.0, Diff: 0.0, Sum: 7.8]
      [GC Worker End (ms): Min: 640.5, Avg: 640.5, Max: 640.5, Diff: 0.0]
   [Code Root Fixup: 0.0 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.0 ms]
   [Other: 0.9 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 0.7 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.0 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.0 ms]
   [Eden: 14.0M(14.0M)->0.0B(22.0M) Survivors: 0.0B->2048.0K Heap: 14.0M(128.0M)->2194.5K(128.0M)]
 [Times: user=0.01 sys=0.00, real=0.00 secs] 
2020-03-14T10:39:06.909-0800: 0.914: [GC pause (G1 Evacuation Pause) (young), 0.0040966 secs]
   [Parallel Time: 2.8 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 913.6, Avg: 913.6, Max: 913.7, Diff: 0.1]
      [Ext Root Scanning (ms): Min: 0.2, Avg: 0.7, Max: 1.6, Diff: 1.4, Sum: 2.8]
      [Update RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.1]
         [Processed Buffers: Min: 0, Avg: 0.2, Max: 1, Diff: 1, Sum: 1]
      [Scan RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Code Root Scanning (ms): Min: 0.0, Avg: 0.2, Max: 0.6, Diff: 0.6, Sum: 0.6]
      [Object Copy (ms): Min: 1.2, Avg: 1.8, Max: 2.4, Diff: 1.2, Sum: 7.4]
      [Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
         [Termination Attempts: Min: 1, Avg: 2.0, Max: 3, Diff: 2, Sum: 8]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [GC Worker Total (ms): Min: 2.7, Avg: 2.7, Max: 2.8, Diff: 0.1, Sum: 11.0]
      [GC Worker End (ms): Min: 916.4, Avg: 916.4, Max: 916.4, Diff: 0.0]
   [Code Root Fixup: 0.0 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.1 ms]
   [Other: 1.2 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 1.0 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.0 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.1 ms]
   [Eden: 22.0M(22.0M)->0.0B(73.0M) Survivors: 2048.0K->3072.0K Heap: 24.1M(128.0M)->4466.5K(128.0M)]
 [Times: user=0.01 sys=0.00, real=0.01 secs] 
2020-03-14T10:39:07.427-0800: 1.432: [GC pause (G1 Evacuation Pause) (young), 0.0108189 secs]
   [Parallel Time: 6.9 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 1432.5, Avg: 1433.2, Max: 1434.3, Diff: 1.8]
      [Ext Root Scanning (ms): Min: 0.0, Avg: 0.7, Max: 1.6, Diff: 1.6, Sum: 3.0]
      [Update RS (ms): Min: 0.0, Avg: 0.2, Max: 0.3, Diff: 0.3, Sum: 0.6]
         [Processed Buffers: Min: 0, Avg: 0.8, Max: 1, Diff: 1, Sum: 3]
      [Scan RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.1]
      [Code Root Scanning (ms): Min: 0.0, Avg: 0.6, Max: 1.1, Diff: 1.1, Sum: 2.3]
      [Object Copy (ms): Min: 4.5, Avg: 4.6, Max: 4.8, Diff: 0.3, Sum: 18.5]
      [Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
         [Termination Attempts: Min: 1, Avg: 3.0, Max: 6, Diff: 5, Sum: 12]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.1, Max: 0.3, Diff: 0.3, Sum: 0.3]
      [GC Worker Total (ms): Min: 5.1, Avg: 6.2, Max: 6.9, Diff: 1.8, Sum: 24.8]
      [GC Worker End (ms): Min: 1439.4, Avg: 1439.4, Max: 1439.4, Diff: 0.0]
   [Code Root Fixup: 0.0 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.1 ms]
   [Other: 3.8 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 3.6 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.0 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.1 ms]
   [Eden: 73.0M(73.0M)->0.0B(66.0M) Survivors: 3072.0K->10.0M Heap: 77.4M(128.0M)->10.9M(128.0M)]
 [Times: user=0.03 sys=0.00, real=0.01 secs] 
2020-03-14T10:39:07.849-0800: 1.854: [GC pause (Metadata GC Threshold) (young) (initial-mark), 0.0070399 secs]
   [Parallel Time: 5.4 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 1854.2, Avg: 1854.2, Max: 1854.2, Diff: 0.1]
      [Ext Root Scanning (ms): Min: 1.0, Avg: 1.2, Max: 1.3, Diff: 0.3, Sum: 4.7]
      [Update RS (ms): Min: 0.0, Avg: 0.1, Max: 0.1, Diff: 0.1, Sum: 0.2]
         [Processed Buffers: Min: 0, Avg: 0.8, Max: 1, Diff: 1, Sum: 3]
      [Scan RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Code Root Scanning (ms): Min: 0.0, Avg: 0.3, Max: 0.6, Diff: 0.6, Sum: 1.3]
      [Object Copy (ms): Min: 3.4, Avg: 3.7, Max: 3.9, Diff: 0.5, Sum: 14.7]
      [Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
         [Termination Attempts: Min: 1, Avg: 4.0, Max: 6, Diff: 5, Sum: 16]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [GC Worker Total (ms): Min: 5.2, Avg: 5.3, Max: 5.3, Diff: 0.1, Sum: 21.0]
      [GC Worker End (ms): Min: 1859.4, Avg: 1859.4, Max: 1859.4, Diff: 0.0]
   [Code Root Fixup: 0.0 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.1 ms]
   [Other: 1.6 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 1.4 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.0 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.1 ms]
   [Eden: 38.0M(66.0M)->0.0B(67.0M) Survivors: 10.0M->9216.0K Heap: 48.4M(128.0M)->10098.5K(128.0M)]
 [Times: user=0.02 sys=0.00, real=0.01 secs] 
2020-03-14T10:39:07.856-0800: 1.861: [GC concurrent-root-region-scan-start]
2020-03-14T10:39:07.863-0800: 1.868: [GC concurrent-root-region-scan-end, 0.0062933 secs]
2020-03-14T10:39:07.863-0800: 1.868: [GC concurrent-mark-start]
2020-03-14T10:39:07.863-0800: 1.868: [GC concurrent-mark-end, 0.0001106 secs]
2020-03-14T10:39:07.863-0800: 1.868: [GC remark 2020-03-14T10:39:07.863-0800: 1.868: [Finalize Marking, 0.0005940 secs] 2020-03-14T10:39:07.863-0800: 1.868: [GC ref-proc, 0.0006483 secs] 2020-03-14T10:39:07.864-0800: 1.869: [Unloading, 0.0024678 secs], 0.0038459 secs]
 [Times: user=0.01 sys=0.00, real=0.00 secs] 
2020-03-14T10:39:07.867-0800: 1.872: [GC cleanup 10M->9727K(128M), 0.0002397 secs]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
2020-03-14T10:39:07.867-0800: 1.872: [GC concurrent-cleanup-start]
2020-03-14T10:39:07.867-0800: 1.872: [GC concurrent-cleanup-end, 0.0000109 secs]
2020-03-14T10:39:09.275-0800: 3.280: [GC pause (G1 Evacuation Pause) (young), 0.0166726 secs]
   [Parallel Time: 11.1 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 3280.4, Avg: 3280.9, Max: 3282.3, Diff: 2.0]
      [Ext Root Scanning (ms): Min: 0.0, Avg: 1.2, Max: 2.3, Diff: 2.3, Sum: 4.9]
      [Update RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
         [Processed Buffers: Min: 0, Avg: 0.8, Max: 3, Diff: 3, Sum: 3]
      [Scan RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Code Root Scanning (ms): Min: 0.0, Avg: 1.2, Max: 2.8, Diff: 2.8, Sum: 5.0]
      [Object Copy (ms): Min: 6.1, Avg: 7.9, Max: 9.4, Diff: 3.3, Sum: 31.6]
      [Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.1, Diff: 0.1, Sum: 0.1]
         [Termination Attempts: Min: 1, Avg: 3.2, Max: 8, Diff: 7, Sum: 13]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [GC Worker Total (ms): Min: 9.0, Avg: 10.4, Max: 11.0, Diff: 2.0, Sum: 41.6]
      [GC Worker End (ms): Min: 3291.3, Avg: 3291.3, Max: 3291.4, Diff: 0.1]
   [Code Root Fixup: 0.1 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.1 ms]
   [Other: 5.4 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 5.0 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.0 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.3 ms]
   [Eden: 67.0M(67.0M)->0.0B(66.0M) Survivors: 9216.0K->10.0M Heap: 75.5M(128.0M)->11.4M(128.0M)]
 [Times: user=0.04 sys=0.00, real=0.02 secs] 
2020-03-14T10:39:10.435-0800: 4.440: [GC pause (G1 Evacuation Pause) (young), 0.0170093 secs]
   [Parallel Time: 13.4 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 4439.9, Avg: 4439.9, Max: 4440.0, Diff: 0.0]
      [Ext Root Scanning (ms): Min: 0.4, Avg: 1.1, Max: 2.7, Diff: 2.3, Sum: 4.3]
      [Update RS (ms): Min: 0.0, Avg: 0.1, Max: 0.2, Diff: 0.2, Sum: 0.2]
         [Processed Buffers: Min: 0, Avg: 0.5, Max: 1, Diff: 1, Sum: 2]
      [Scan RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.1]
      [Code Root Scanning (ms): Min: 0.0, Avg: 1.7, Max: 3.7, Diff: 3.7, Sum: 6.7]
      [Object Copy (ms): Min: 9.2, Avg: 10.6, Max: 11.6, Diff: 2.5, Sum: 42.3]
      [Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
         [Termination Attempts: Min: 1, Avg: 2.0, Max: 3, Diff: 2, Sum: 8]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [GC Worker Total (ms): Min: 13.4, Avg: 13.4, Max: 13.4, Diff: 0.0, Sum: 53.6]
      [GC Worker End (ms): Min: 4453.3, Avg: 4453.3, Max: 4453.3, Diff: 0.0]
   [Code Root Fixup: 0.1 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.1 ms]
   [Other: 3.4 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 2.9 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.0 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.3 ms]
   [Eden: 66.0M(66.0M)->0.0B(66.0M) Survivors: 10.0M->10.0M Heap: 77.4M(128.0M)->16.4M(128.0M)]
 [Times: user=0.06 sys=0.01, real=0.02 secs]

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_垃圾回收_09

这里注意下，G1回收的也有可能是mixed类型的，因为old区和young区的gc，g1收集器都可以进行回收

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_垃圾回收_10

4.2.1.具体分析上面图示的步骤

2020-03-14T10:39:06.633-0800: 0.638: [GC pause (G1 Evacuation Pause) (young), 0.0029785 secs]
   [Parallel Time: 2.0 ms, GC Workers: 4]                                          #并行执行四个线程,共计消耗2ms
      [GC Worker Start (ms): Min: 638.5, Avg: 638.5, Max: 638.5, Diff: 0.0]        #四个线程 
      [Ext Root Scanning (ms): Min: 0.1, Avg: 0.5, Max: 0.9, Diff: 0.8, Sum: 2.1]
      [Update RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
         [Processed Buffers: Min: 0, Avg: 0.0, Max: 0, Diff: 0, Sum: 0]
      [Scan RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Code Root Scanning (ms): Min: 0.0, Avg: 0.3, Max: 0.8, Diff: 0.8, Sum: 1.2]
      [Object Copy (ms): Min: 0.6, Avg: 1.1, Max: 1.5, Diff: 0.9, Sum: 4.5]
      [Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
         [Termination Attempts: Min: 1, Avg: 2.5, Max: 5, Diff: 4, Sum: 10]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.1]
      [GC Worker Total (ms): Min: 1.9, Avg: 2.0, Max: 2.0, Diff: 0.0, Sum: 7.8]
      [GC Worker End (ms): Min: 640.5, Avg: 640.5, Max: 640.5, Diff: 0.0]
   [Code Root Fixup: 0.0 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.0 ms]
   [Other: 0.9 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 0.7 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.0 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.0 ms]
   [Eden: 14.0M(14.0M)->0.0B(22.0M) Survivors: 0.0B->2048.0K Heap: 14.0M(128.0M)->2194.5K(128.0M)]
 [Times: user=0.01 sys=0.00, real=0.00 secs]

4.2.2.关于参数的说明，大家可以参考下面的地址

​​https://blogs.oracle.com/poonam/understanding-g1-gc-logs​​

6.GC垃圾回收日志分析-界面工具

6.0.下载地址

​

6.1.GCViewer

​​https://gceasy.io/​​

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_sed_11

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_sed_12

6.2.在线工具 gceasy

6.2.1.官网

https://gceasy.io/

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_java_13


JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_java_14

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_sed_15


JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_垃圾回收_16

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_垃圾回收_17

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_java_18

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_垃圾回收_19

JVM之垃圾回收日志分析以及常用垃圾回收日志分析的界面工具_java_20

6.2.2.使用介绍


标签：Min,0.0,回收,secs,垃圾,ms,Diff,日志,Avg
From： https://blog.51cto.com/u_11812624/5732900

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