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Java G1 垃圾回收器

Java GC 大约 15513 字

以前收集器特点

  • 年轻代和老年代是各自独立且连续的内存块。
  • 年轻代收集使用eden+S0+S1进行复制算法。
  • 老年代收集必须扫描整个老年代区域。
  • 都是以尽可能少而快速地执行GC为设计原则。

G1 特点

  • CMS收集器一样,能与应用程序线程并发执行。
  • 整理空闲空间更快。
  • 需要更多的时间来预测GC停顿的时间。
  • 不希望牺牲大量的吞吐性能。
  • 不需要更大的Java Heap
  • Java9默认垃圾收集器,取代CMS

与 CMS 比较

  • G1是一个有整理内存过程的垃圾收集器,不会产生很多内存碎片。
  • G1STW更可控,G1在停顿时间上添加了预测机制,用户可以指定期望停顿的时间。

主要改变

  • EdenSurvivorTenured等内存区域不再是连续的了,而是变成了一个个大小一样的region
  • 每个region1M32M不等。一个region有可能属于EdenSurvivor或者Tenured内存区域。
  • 启动时可以通过参数-XX:+G1HeapRegionSize=n指定分区大小(1M~`32M,且必须是2的幂),默认将整个堆划分为2048个分区。即支持的最大内存为:32MB * 2048 = 65536MB = 64G`

4 步过程

  1. 初始标记:会STW。只标记GC Roots能直接关联到的对象。
  2. 并发标记:进行GC Roots Tracing的过程。
  3. 最终标记:修正并发标记期间,因程序运行导致标记发生变化的那一部分对象。
  4. 筛选回收:根据时间来进行价值最大化的回收。

常用参数配置

  • -XX:+UseG1GC
  • -XX:G1HeapRegionSize=n
  • -XX:MaxGCPauseMillis=n:最大GC停顿时间,这是个软目标,JVM尽可能(但不保证)停顿小于这个时间。
  • -XX:InitialHeapOccupancyPercent=n:堆占用多少的时候就触发GC,默认45%
  • -XX:ConcGCThreads=n:并发GC使用的线程数。
  • -XX:G1ReservePercent=n:设置作为空闲空间的预留内存百分比,以降低目标空间溢出的风险,默认值是10%

推荐配置:-XX:UseG1GC -Xmx32G -XX:MaxGCPauseMillis=100

G1 回收相关日志

[GC pause (G1 Humongous Allocation) (young) (initial-mark) (to-space exhausted), 0.0111710 secs]
   [Parallel Time: 8.8 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 228.4, Avg: 228.4, Max: 228.5, Diff: 0.1]
      [Ext Root Scanning (ms): Min: 4.1, Avg: 7.3, Max: 8.4, Diff: 4.3, Sum: 29.4]
      [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: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Object Copy (ms): Min: 0.0, Avg: 1.3, Max: 4.5, Diff: 4.5, Sum: 5.0]
      [Termination (ms): Min: 0.0, Avg: 0.1, Max: 0.3, Diff: 0.3, Sum: 0.5]
         [Termination Attempts: Min: 1, Avg: 1.0, Max: 1, Diff: 0, Sum: 4]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.1, Max: 0.1, Diff: 0.0, Sum: 0.2]
      [GC Worker Total (ms): Min: 8.7, Avg: 8.8, Max: 8.8, Diff: 0.1, Sum: 35.1]
      [GC Worker End (ms): Min: 237.2, Avg: 237.2, Max: 237.2, Diff: 0.0]
   [Code Root Fixup: 0.0 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.1 ms]
   [Other: 2.3 ms]
      [Evacuation Failure: 2.0 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 0.1 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.1 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.0 ms]
   [Eden: 6144.0K(6144.0K)->0.0B(1024.0K) Survivors: 0.0B->0.0B Heap: 10078.5K(10.0M)->8095.1K(10.0M)]
 [Times: user=0.02 sys=0.00, real=0.01 secs] 
[GC concurrent-root-region-scan-start]
[GC concurrent-root-region-scan-end, 0.0000286 secs]
[GC concurrent-mark-start]
[GC concurrent-mark-end, 0.0018859 secs]
[GC remark [Finalize Marking, 0.0001199 secs] [GC ref-proc, 0.0002564 secs] [Unloading, 0.0006426 secs], 0.0012215 secs]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
[GC cleanup 9107K->9107K(10M), 0.0002842 secs]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
[GC pause (G1 Humongous Allocation) (young) (to-space exhausted), 0.0011358 secs]
   [Parallel Time: 0.8 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 245.7, Avg: 245.9, Max: 246.4, Diff: 0.7]
      [Ext Root Scanning (ms): Min: 0.0, Avg: 0.1, Max: 0.2, Diff: 0.2, Sum: 0.5]
      [Update RS (ms): Min: 0.0, Avg: 0.3, Max: 0.4, Diff: 0.4, Sum: 1.1]
         [Processed Buffers: Min: 0, Avg: 1.5, Max: 2, Diff: 2, Sum: 6]
      [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: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Object Copy (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Termination (ms): Min: 0.0, Avg: 0.1, Max: 0.2, Diff: 0.2, Sum: 0.3]
         [Termination Attempts: Min: 1, Avg: 1.0, Max: 1, Diff: 0, Sum: 4]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [GC Worker Total (ms): Min: 0.0, Avg: 0.5, Max: 0.7, Diff: 0.7, Sum: 2.0]
      [GC Worker End (ms): Min: 246.4, Avg: 246.4, Max: 246.4, Diff: 0.0]
   [Code Root Fixup: 0.0 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.1 ms]
   [Other: 0.3 ms]
      [Evacuation Failure: 0.1 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 0.1 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.1 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.0 ms]
   [Eden: 1024.0K(1024.0K)->0.0B(1024.0K) Survivors: 0.0B->0.0B Heap: 9107.3K(10.0M)->7123.9K(10.0M)]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
[GC pause (G1 Humongous Allocation) (mixed), 0.0008759 secs]
   [Parallel Time: 0.6 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 247.9, Avg: 248.0, Max: 248.2, Diff: 0.3]
      [Ext Root Scanning (ms): Min: 0.0, Avg: 0.2, Max: 0.2, Diff: 0.2, Sum: 0.6]
      [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: 0.1, Diff: 0.1, Sum: 0.1]
      [Code Root Scanning (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Object Copy (ms): Min: 0.1, Avg: 0.2, Max: 0.3, Diff: 0.1, Sum: 0.7]
      [Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.1, Diff: 0.1, Sum: 0.2]
         [Termination Attempts: Min: 1, Avg: 1.5, Max: 3, Diff: 2, Sum: 6]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [GC Worker Total (ms): Min: 0.2, Avg: 0.4, Max: 0.5, Diff: 0.3, Sum: 1.6]
      [GC Worker End (ms): Min: 248.4, Avg: 248.4, Max: 248.4, Diff: 0.0]
   [Code Root Fixup: 0.0 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.1 ms]
   [Other: 0.2 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 0.1 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.1 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.0 ms]
   [Eden: 0.0B(1024.0K)->0.0B(1024.0K) Survivors: 0.0B->0.0B Heap: 8115.7K(10.0M)->7216.7K(10.0M)]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
[Full GC (Allocation Failure)  7216K->2651K(10M), 0.0050035 secs]
   [Eden: 0.0B(1024.0K)->0.0B(5120.0K) Survivors: 0.0B->0.0B Heap: 7216.7K(10.0M)->2651.2K(10.0M)], [Metaspace: 3478K->3478K(1056768K)]
 [Times: user=0.06 sys=0.00, real=0.01 secs] 
[GC pause (G1 Humongous Allocation) (young) (initial-mark), 0.0007522 secs]
   [Parallel Time: 0.4 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 255.6, Avg: 255.7, Max: 255.9, Diff: 0.3]
      [Ext Root Scanning (ms): Min: 0.0, Avg: 0.2, Max: 0.3, Diff: 0.3, Sum: 0.9]
      [Update RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
         [Processed Buffers: Min: 0, Avg: 0.5, Max: 2, Diff: 2, Sum: 2]
      [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: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Object Copy (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.1, Diff: 0.1, Sum: 0.2]
         [Termination Attempts: Min: 1, Avg: 1.0, Max: 1, Diff: 0, Sum: 4]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [GC Worker Total (ms): Min: 0.1, Avg: 0.3, Max: 0.4, Diff: 0.3, Sum: 1.1]
      [GC Worker End (ms): Min: 255.9, Avg: 256.0, Max: 256.0, Diff: 0.0]
   [Code Root Fixup: 0.0 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.1 ms]
   [Other: 0.3 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 0.1 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.1 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.0 ms]
   [Eden: 1024.0K(5120.0K)->0.0B(4096.0K) Survivors: 0.0B->0.0B Heap: 4737.1K(10.0M)->3642.9K(10.0M)]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
[GC concurrent-root-region-scan-start]
[GC concurrent-root-region-scan-end, 0.0000115 secs]
[GC concurrent-mark-start]
[GC pause (G1 Humongous Allocation) (young), 0.0006502 secs]
   [Parallel Time: 0.4 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 258.1, Avg: 258.2, Max: 258.4, Diff: 0.3]
      [Ext Root Scanning (ms): Min: 0.0, Avg: 0.1, Max: 0.2, Diff: 0.2, Sum: 0.6]
      [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: 2, Diff: 2, 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: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Object Copy (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.1, Diff: 0.1, Sum: 0.2]
         [Termination Attempts: Min: 1, Avg: 1.0, Max: 1, Diff: 0, Sum: 4]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [GC Worker Total (ms): Min: 0.0, Avg: 0.2, Max: 0.3, Diff: 0.3, Sum: 0.8]
      [GC Worker End (ms): Min: 258.4, Avg: 258.5, Max: 258.5, Diff: 0.0]
   [Code Root Fixup: 0.0 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.1 ms]
   [Other: 0.2 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 0.1 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.1 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.0 ms]
   [Eden: 1024.0K(4096.0K)->0.0B(1024.0K) Survivors: 0.0B->1024.0K Heap: 7691.7K(10.0M)->5628.4K(10.0M)]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
[GC concurrent-mark-end, 0.0043059 secs]
[GC remark [Finalize Marking, 0.0001207 secs] [GC ref-proc, 0.0002671 secs] [Unloading, 0.0006946 secs], 0.0012932 secs]
 [Times: user=0.05 sys=0.00, real=0.00 secs] 
[GC cleanup 7632K->7632K(10M), 0.0003345 secs]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
[GC pause (G1 Humongous Allocation) (young) (to-space exhausted), 0.0006029 secs]
   [Parallel Time: 0.3 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 267.9, Avg: 267.9, Max: 268.0, Diff: 0.2]
      [Ext Root Scanning (ms): Min: 0.0, Avg: 0.1, Max: 0.2, Diff: 0.2, Sum: 0.6]
      [Update RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
         [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: 0.0]
      [Code Root Scanning (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Object Copy (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [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: 4]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [GC Worker Total (ms): Min: 0.1, Avg: 0.2, Max: 0.2, Diff: 0.2, Sum: 0.7]
      [GC Worker End (ms): Min: 268.1, Avg: 268.1, Max: 268.1, Diff: 0.0]
   [Code Root Fixup: 0.0 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.1 ms]
   [Other: 0.3 ms]
      [Evacuation Failure: 0.1 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 0.1 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.1 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.0 ms]
   [Eden: 1024.0K(1024.0K)->0.0B(1024.0K) Survivors: 1024.0K->0.0B Heap: 7652.8K(10.0M)->7652.8K(10.0M)]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
[Full GC (Allocation Failure)  7652K->2647K(10M), 0.0042283 secs]
   [Eden: 0.0B(1024.0K)->0.0B(5120.0K) Survivors: 0.0B->0.0B Heap: 7652.8K(10.0M)->2647.0K(10.0M)], [Metaspace: 3478K->3478K(1056768K)]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
[GC pause (G1 Humongous Allocation) (young) (initial-mark), 0.0006793 secs]
   [Parallel Time: 0.4 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 274.4, Avg: 274.5, Max: 274.7, Diff: 0.2]
      [Ext Root Scanning (ms): Min: 0.0, Avg: 0.2, Max: 0.3, Diff: 0.3, Sum: 0.7]
      [Update RS (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
         [Processed Buffers: Min: 0, Avg: 0.3, 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: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Object Copy (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.1, Diff: 0.1, Sum: 0.1]
         [Termination Attempts: Min: 1, Avg: 1.0, Max: 1, Diff: 0, Sum: 4]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [GC Worker Total (ms): Min: 0.1, Avg: 0.2, Max: 0.3, Diff: 0.2, Sum: 0.9]
      [GC Worker End (ms): Min: 274.8, Avg: 274.8, Max: 274.8, Diff: 0.0]
   [Code Root Fixup: 0.0 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.1 ms]
   [Other: 0.3 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 0.1 ms]
      [Ref Enq: 0.0 ms]
      [Redirty Cards: 0.1 ms]
      [Humongous Register: 0.0 ms]
      [Humongous Reclaim: 0.0 ms]
      [Free CSet: 0.0 ms]
   [Eden: 0.0B(5120.0K)->0.0B(3072.0K) Survivors: 0.0B->0.0B Heap: 4630.5K(10.0M)->4630.5K(10.0M)]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
[GC concurrent-root-region-scan-start]
[GC concurrent-root-region-scan-end, 0.0000111 secs]
[GC concurrent-mark-start]
[GC concurrent-mark-end, 0.0028582 secs]
[GC pause (G1 Humongous Allocation) (young), 0.0007825 secs]
   [Parallel Time: 0.5 ms, GC Workers: 4]
      [GC Worker Start (ms): Min: 278.5, Avg: 278.7, Max: 278.9, Diff: 0.4]
      [Ext Root Scanning (ms): Min: 0.0, Avg: 0.1, Max: 0.3, Diff: 0.3, Sum: 0.5]
      [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: 2, Diff: 2, 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: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Object Copy (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [Termination (ms): Min: 0.0, Avg: 0.0, Max: 0.1, Diff: 0.1, Sum: 0.2]
         [Termination Attempts: Min: 1, Avg: 1.0, Max: 1, Diff: 0, Sum: 4]
      [GC Worker Other (ms): Min: 0.0, Avg: 0.0, Max: 0.0, Diff: 0.0, Sum: 0.0]
      [GC Worker Total (ms): Min: 0.0, Avg: 0.2, Max: 0.4, Diff: 0.4, Sum: 0.8]
      [GC Worker End (ms): Min: 278.9, Avg: 278.9, Max: 278.9, Diff: 0.0]
   [Code Root Fixup: 0.0 ms]
   [Code Root Purge: 0.0 ms]
   [Clear CT: 0.1 ms]
   [Other: 0.3 ms]
      [Choose CSet: 0.0 ms]
      [Ref Proc: 0.1 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: 1024.0K(3072.0K)->0.0B(1024.0K) Survivors: 0.0B->0.0B Heap: 8658.9K(10.0M)->6614.0K(10.0M)]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
[Full GC (Allocation Failure)  6613K->6613K(10M), 0.0035998 secs]
   [Eden: 0.0B(1024.0K)->0.0B(1024.0K) Survivors: 0.0B->0.0B Heap: 6614.0K(10.0M)->6613.9K(10.0M)], [Metaspace: 3478K->3478K(1056768K)]
 [Times: user=0.02 sys=0.00, real=0.00 secs] 
[Full GC (Allocation Failure)  6613K->6594K(10M), 0.0037329 secs]
   [Eden: 0.0B(1024.0K)->0.0B(1024.0K) Survivors: 0.0B->0.0B Heap: 6613.9K(10.0M)->6594.1K(10.0M)], [Metaspace: 3478K->3478K(1056768K)]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
[GC remark, 0.0000162 secs]
 [Times: user=0.00 sys=0.00, real=0.00 secs] 
[GC concurrent-mark-abort]
Heap
 garbage-first heap   total 10240K, used 6594K [0x00000000ff600000, 0x00000000ff700050, 0x0000000100000000)
  region size 1024K, 1 young (1024K), 0 survivors (0K)
 Metaspace       used 3509K, capacity 4496K, committed 4864K, reserved 1056768K
  class space    used 384K, capacity 388K, committed 512K, reserved 1048576K
阅读 96 · 发布于 2022-05-30

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