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JDK11的ZGC小试牛刀

go4it
 go4it
发布于 07/22 21:31
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本文主要试一下JDK11的ZGC

ZGC

ZGC全称是Z Garbage Collector,是一款可伸缩(scalable)的低延迟(low latency garbage)、并发(concurrent)垃圾回收器,旨在实现以下几个目标:

  • 停顿时间不超过10ms
  • 停顿时间不随heap大小或存活对象大小增大而增大
  • 可以处理从几百兆到几T的内存大小

设置

-server -XX:+UnlockExperimentalVMOptions -XX:+UseZGC -Xlog:age*,gc*=info:file=gc-%t.log:time,tid,tags:filecount=3,filesize=20m -Djava.io.tmpdir=/tmp'

log实例

[2018-07-22T13:17:59.526+0000][7][gc,init] Initializing The Z Garbage Collector
[2018-07-22T13:17:59.526+0000][7][gc,init] Version: 11-ea+22 (release)
[2018-07-22T13:17:59.526+0000][7][gc,init] NUMA Support: Disabled
[2018-07-22T13:17:59.526+0000][7][gc,init] CPUs: 2 total, 2 available
[2018-07-22T13:17:59.530+0000][7][gc,init] Memory: 2001M
[2018-07-22T13:17:59.530+0000][7][gc,init] Large Page Support: Disabled
[2018-07-22T13:17:59.530+0000][7][gc,init] Workers: 4 parallel, 4 concurrent
[2018-07-22T13:17:59.531+0000][7][gc,init] Heap backed by file: /memfd:java_heap
[2018-07-22T13:17:59.532+0000][7][gc,init] Available space on backing filesystem: N/A
[2018-07-22T13:17:59.540+0000][7][gc,init] Pre-touching: Disabled
[2018-07-22T13:17:59.540+0000][7][gc,init] Pre-mapping: 32M
[2018-07-22T13:17:59.576+0000][7][gc,init] Runtime Workers: 4 parallel
[2018-07-22T13:17:59.584+0000][7][gc     ] Using The Z Garbage Collector
[2018-07-22T13:18:01.071+0000][13][gc,start] GC(0) Garbage Collection (Warmup)
[2018-07-22T13:18:01.072+0000][19][gc,phases] GC(0) Pause Mark Start 0.370ms
[2018-07-22T13:18:01.102+0000][13][gc,phases] GC(0) Concurrent Mark 29.459ms
[2018-07-22T13:18:01.102+0000][19][gc,phases] GC(0) Pause Mark End 0.513ms
[2018-07-22T13:18:01.103+0000][13][gc,phases] GC(0) Concurrent Process Non-Strong References 0.410ms
[2018-07-22T13:18:01.103+0000][13][gc,phases] GC(0) Concurrent Reset Relocation Set 0.000ms
[2018-07-22T13:18:01.103+0000][13][gc,phases] GC(0) Concurrent Destroy Detached Pages 0.000ms
[2018-07-22T13:18:01.105+0000][13][gc,phases] GC(0) Concurrent Select Relocation Set 1.739ms
[2018-07-22T13:18:01.105+0000][13][gc,phases] GC(0) Concurrent Prepare Relocation Set 0.342ms
[2018-07-22T13:18:01.112+0000][19][gc,phases] GC(0) Pause Relocate Start 7.167ms
[2018-07-22T13:18:01.126+0000][13][gc,phases] GC(0) Concurrent Relocate 9.600ms
[2018-07-22T13:18:01.126+0000][13][gc,load  ] GC(0) Load: 0.09/0.43/0.23
[2018-07-22T13:18:01.128+0000][13][gc,mmu   ] GC(0) MMU: 2ms/0.0%, 5ms/0.0%, 10ms/27.3%, 20ms/61.6%, 50ms/83.9%, 100ms/92.0%
[2018-07-22T13:18:01.129+0000][13][gc,marking] GC(0) Mark: 4 stripe(s), 1 proactive flush(es), 2 terminate flush(es), 1 completion(s), 0 continuation(s) 
[2018-07-22T13:18:01.129+0000][13][gc,reloc  ] GC(0) Relocation: Successful, 3M relocated
[2018-07-22T13:18:01.129+0000][13][gc,nmethod] GC(0) NMethods: 379 registered, 0 unregistered
[2018-07-22T13:18:01.129+0000][13][gc,metaspace] GC(0) Metaspace: 14M used, 14M capacity, 14M committed, 16M reserved
[2018-07-22T13:18:01.129+0000][13][gc,ref      ] GC(0) Soft: 491 encountered, 0 discovered, 0 enqueued
[2018-07-22T13:18:01.129+0000][13][gc,ref      ] GC(0) Weak: 477 encountered, 334 discovered, 102 enqueued
[2018-07-22T13:18:01.129+0000][13][gc,ref      ] GC(0) Final: 57 encountered, 0 discovered, 0 enqueued
[2018-07-22T13:18:01.129+0000][13][gc,ref      ] GC(0) Phantom: 1229 encountered, 1227 discovered, 1223 enqueued
[2018-07-22T13:18:01.129+0000][13][gc,heap     ] GC(0)                Mark Start          Mark End        Relocate Start      Relocate End           High               Low         
[2018-07-22T13:18:01.129+0000][13][gc,heap     ] GC(0)  Capacity:       92M (18%)          96M (19%)          96M (19%)         102M (20%)         102M (20%)          92M (18%)    
[2018-07-22T13:18:01.129+0000][13][gc,heap     ] GC(0)   Reserve:       40M (8%)           40M (8%)           40M (8%)           40M (8%)           40M (8%)           40M (8%)     
[2018-07-22T13:18:01.129+0000][13][gc,heap     ] GC(0)      Free:      410M (82%)         406M (81%)         406M (81%)         448M (89%)         448M (89%)         400M (80%)    
[2018-07-22T13:18:01.129+0000][13][gc,heap     ] GC(0)      Used:       52M (10%)          56M (11%)          56M (11%)          14M (3%)           62M (12%)          14M (3%)     
[2018-07-22T13:18:01.129+0000][13][gc,heap     ] GC(0)      Live:         -                 3M (1%)            3M (1%)            3M (1%)             -                  -          
[2018-07-22T13:18:01.129+0000][13][gc,heap     ] GC(0) Allocated:         -                 4M (1%)            4M (1%)           12M (2%)             -                  -          
[2018-07-22T13:18:01.132+0000][13][gc,heap     ] GC(0)   Garbage:         -                48M (10%)          48M (10%)           4M (1%)             -                  -          
[2018-07-22T13:18:01.132+0000][13][gc,heap     ] GC(0) Reclaimed:         -                  -                 0M (0%)           44M (9%)             -                  -          
[2018-07-22T13:18:01.132+0000][13][gc          ] GC(0) Garbage Collection (Warmup) 52M(10%)->14M(3%)
[2018-07-22T13:18:02.172+0000][13][gc,start    ] GC(1) Garbage Collection (Warmup)
[2018-07-22T13:18:02.173+0000][19][gc,phases   ] GC(1) Pause Mark Start 0.776ms
[2018-07-22T13:18:02.198+0000][13][gc,phases   ] GC(1) Concurrent Mark 24.883ms
[2018-07-22T13:18:02.198+0000][19][gc,phases   ] GC(1) Pause Mark End 0.256ms
[2018-07-22T13:18:02.205+0000][13][gc,phases   ] GC(1) Concurrent Process Non-Strong References 6.484ms
[2018-07-22T13:18:02.205+0000][13][gc,phases   ] GC(1) Concurrent Reset Relocation Set 0.005ms
[2018-07-22T13:18:02.205+0000][13][gc,phases   ] GC(1) Concurrent Destroy Detached Pages 0.000ms
[2018-07-22T13:18:02.206+0000][13][gc,phases   ] GC(1) Concurrent Select Relocation Set 1.104ms
[2018-07-22T13:18:02.210+0000][13][gc,phases   ] GC(1) Concurrent Prepare Relocation Set 3.879ms
[2018-07-22T13:18:02.220+0000][19][gc,phases   ] GC(1) Pause Relocate Start 9.183ms
[2018-07-22T13:18:02.229+0000][13][gc,phases   ] GC(1) Concurrent Relocate 8.888ms
[2018-07-22T13:18:02.229+0000][13][gc,load     ] GC(1) Load: 0.09/0.43/0.23
[2018-07-22T13:18:02.229+0000][13][gc,mmu      ] GC(1) MMU: 2ms/0.0%, 5ms/0.0%, 10ms/8.2%, 20ms/54.1%, 50ms/79.6%, 100ms/89.8%
[2018-07-22T13:18:02.229+0000][13][gc,marking  ] GC(1) Mark: 4 stripe(s), 3 proactive flush(es), 1 terminate flush(es), 1 completion(s), 0 continuation(s) 
[2018-07-22T13:18:02.229+0000][13][gc,reloc    ] GC(1) Relocation: Successful, 6M relocated
[2018-07-22T13:18:02.229+0000][13][gc,nmethod  ] GC(1) NMethods: 572 registered, 0 unregistered
[2018-07-22T13:18:02.229+0000][13][gc,metaspace] GC(1) Metaspace: 22M used, 22M capacity, 23M committed, 24M reserved
[2018-07-22T13:18:02.229+0000][13][gc,ref      ] GC(1) Soft: 838 encountered, 0 discovered, 0 enqueued
[2018-07-22T13:18:02.229+0000][13][gc,ref      ] GC(1) Weak: 875 encountered, 259 discovered, 154 enqueued
[2018-07-22T13:18:02.229+0000][13][gc,ref      ] GC(1) Final: 57 encountered, 46 discovered, 0 enqueued
[2018-07-22T13:18:02.229+0000][13][gc,ref      ] GC(1) Phantom: 2544 encountered, 2541 discovered, 2536 enqueued
[2018-07-22T13:18:02.229+0000][13][gc,heap     ] GC(1)                Mark Start          Mark End        Relocate Start      Relocate End           High               Low         
[2018-07-22T13:18:02.229+0000][13][gc,heap     ] GC(1)  Capacity:      148M (29%)         152M (30%)         152M (30%)         158M (31%)         158M (31%)         148M (29%)    
[2018-07-22T13:18:02.229+0000][13][gc,heap     ] GC(1)   Reserve:       40M (8%)           40M (8%)           40M (8%)           40M (8%)           40M (8%)           40M (8%)     
[2018-07-22T13:18:02.229+0000][13][gc,heap     ] GC(1)      Free:      354M (71%)         350M (70%)         350M (70%)         448M (89%)         448M (89%)         344M (69%)    
[2018-07-22T13:18:02.229+0000][13][gc,heap     ] GC(1)      Used:      108M (22%)         112M (22%)         112M (22%)          14M (3%)          118M (24%)          14M (3%)     
[2018-07-22T13:18:02.229+0000][13][gc,heap     ] GC(1)      Live:         -                 6M (1%)            6M (1%)            6M (1%)             -                  -          
[2018-07-22T13:18:02.229+0000][13][gc,heap     ] GC(1) Allocated:         -                 4M (1%)            4M (1%)           14M (3%)             -                  -          
[2018-07-22T13:18:02.229+0000][13][gc,heap     ] GC(1)   Garbage:         -               101M (20%)         101M (20%)           3M (1%)             -                  -          
[2018-07-22T13:18:02.229+0000][13][gc,heap     ] GC(1) Reclaimed:         -                  -                 0M (0%)           98M (20%)            -                  -          
[2018-07-22T13:18:02.229+0000][13][gc          ] GC(1) Garbage Collection (Warmup) 108M(22%)->14M(3%)
[2018-07-22T13:18:03.670+0000][13][gc,start    ] GC(2) Garbage Collection (Warmup)
[2018-07-22T13:18:03.671+0000][19][gc,phases   ] GC(2) Pause Mark Start 0.676ms
[2018-07-22T13:18:03.731+0000][13][gc,phases   ] GC(2) Concurrent Mark 59.720ms
[2018-07-22T13:18:03.732+0000][19][gc,phases   ] GC(2) Pause Mark End 0.344ms
[2018-07-22T13:18:03.733+0000][13][gc,phases   ] GC(2) Concurrent Process Non-Strong References 1.265ms
[2018-07-22T13:18:03.733+0000][13][gc,phases   ] GC(2) Concurrent Reset Relocation Set 0.151ms
[2018-07-22T13:18:03.733+0000][13][gc,phases   ] GC(2) Concurrent Destroy Detached Pages 0.000ms
[2018-07-22T13:18:03.734+0000][13][gc,phases   ] GC(2) Concurrent Select Relocation Set 1.317ms
[2018-07-22T13:18:03.735+0000][13][gc,phases   ] GC(2) Concurrent Prepare Relocation Set 0.768ms
[2018-07-22T13:18:03.749+0000][19][gc,phases   ] GC(2) Pause Relocate Start 13.753ms
[2018-07-22T13:18:03.776+0000][13][gc,phases   ] GC(2) Concurrent Relocate 26.811ms
[2018-07-22T13:18:03.776+0000][13][gc,load     ] GC(2) Load: 0.33/0.47/0.25
[2018-07-22T13:18:03.776+0000][13][gc,mmu      ] GC(2) MMU: 2ms/0.0%, 5ms/0.0%, 10ms/0.0%, 20ms/29.5%, 50ms/71.8%, 100ms/85.2%
[2018-07-22T13:18:03.776+0000][13][gc,marking  ] GC(2) Mark: 4 stripe(s), 3 proactive flush(es), 1 terminate flush(es), 0 completion(s), 0 continuation(s) 
[2018-07-22T13:18:03.776+0000][13][gc,reloc    ] GC(2) Relocation: Successful, 8M relocated
[2018-07-22T13:18:03.776+0000][13][gc,nmethod  ] GC(2) NMethods: 1316 registered, 0 unregistered
[2018-07-22T13:18:03.776+0000][13][gc,metaspace] GC(2) Metaspace: 29M used, 29M capacity, 29M committed, 30M reserved
[2018-07-22T13:18:03.776+0000][13][gc,ref      ] GC(2) Soft: 1822 encountered, 0 discovered, 0 enqueued
[2018-07-22T13:18:03.776+0000][13][gc,ref      ] GC(2) Weak: 1354 encountered, 493 discovered, 51 enqueued
[2018-07-22T13:18:03.776+0000][13][gc,ref      ] GC(2) Final: 57 encountered, 0 discovered, 0 enqueued
[2018-07-22T13:18:03.776+0000][13][gc,ref      ] GC(2) Phantom: 2712 encountered, 2709 discovered, 2704 enqueued
[2018-07-22T13:18:03.776+0000][13][gc,heap     ] GC(2)                Mark Start          Mark End        Relocate Start      Relocate End           High               Low         
[2018-07-22T13:18:03.776+0000][13][gc,heap     ] GC(2)  Capacity:      196M (39%)         198M (39%)         198M (39%)         210M (42%)         210M (42%)         196M (39%)    
[2018-07-22T13:18:03.776+0000][13][gc,heap     ] GC(2)   Reserve:       40M (8%)           40M (8%)           40M (8%)           40M (8%)           40M (8%)           40M (8%)     
[2018-07-22T13:18:03.776+0000][13][gc,heap     ] GC(2)      Free:      306M (61%)         304M (61%)         304M (61%)         436M (87%)         436M (87%)         292M (58%)    
[2018-07-22T13:18:03.776+0000][13][gc,heap     ] GC(2)      Used:      156M (31%)         158M (31%)         158M (31%)          26M (5%)          170M (34%)          26M (5%)     
[2018-07-22T13:18:03.776+0000][13][gc,heap     ] GC(2)      Live:         -                12M (3%)           12M (3%)           12M (3%)             -                  -          
[2018-07-22T13:18:03.777+0000][13][gc,heap     ] GC(2) Allocated:         -                 2M (0%)            2M (0%)           18M (4%)             -                  -          
[2018-07-22T13:18:03.777+0000][13][gc,heap     ] GC(2)   Garbage:         -               143M (29%)         143M (29%)          11M (2%)             -                  -          
[2018-07-22T13:18:03.777+0000][13][gc,heap     ] GC(2) Reclaimed:         -                  -                 0M (0%)          132M (26%)            -                  -          
[2018-07-22T13:18:03.777+0000][13][gc          ] GC(2) Garbage Collection (Warmup) 156M(31%)->26M(5%)
[2018-07-22T13:18:09.871+0000][14][gc,stats    ] === Garbage Collection Statistics =======================================================================================================================
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]                                                              Last 10s              Last 10m              Last 10h                Total
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]                                                              Avg / Max             Avg / Max             Avg / Max             Avg / Max
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]   Collector: Garbage Collection Cycle                     72.501 / 105.977      72.501 / 105.977      72.501 / 105.977      72.501 / 105.977     ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]  Contention: Mark Segment Reset Contention                     0 / 2                 0 / 2                 0 / 2                 0 / 2           ops/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]  Contention: Mark SeqNum Reset Contention                      0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]  Contention: Relocation Contention                             0 / 2                 0 / 2                 0 / 2                 0 / 2           ops/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Critical: Allocation Stall                              0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Critical: Allocation Stall                                  0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Critical: GC Locker Stall                               0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Critical: GC Locker Stall                                   0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]      Memory: Allocation Rate                                  58 / 108              58 / 108              58 / 108              58 / 108         MB/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]      Memory: Heap Used After Mark                            108 / 158             108 / 158             108 / 158             108 / 158         MB
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]      Memory: Heap Used After Relocation                       18 / 26               18 / 26               18 / 26               18 / 26          MB
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]      Memory: Heap Used Before Mark                           105 / 156             105 / 156             105 / 156             105 / 156         MB
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]      Memory: Heap Used Before Relocation                     108 / 158             108 / 158             108 / 158             108 / 158         MB
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]      Memory: Out Of Memory                                     0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]      Memory: Page Cache Flush                                  0 / 0                 0 / 0                 0 / 0                 0 / 0           MB/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]      Memory: Page Cache Hit L1                                15 / 54               15 / 54               15 / 54               15 / 54          ops/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]      Memory: Page Cache Hit L2                                 0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]      Memory: Page Cache Miss                                  15 / 36               15 / 36               15 / 36               15 / 36          ops/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]      Memory: Undo Object Allocation Failed                     0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]      Memory: Undo Object Allocation Succeeded                  0 / 2                 0 / 2                 0 / 2                 0 / 2           ops/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]      Memory: Undo Page Allocation                              0 / 2                 0 / 2                 0 / 2                 0 / 2           ops/s
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]       Phase: Concurrent Destroy Detached Pages             0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]       Phase: Concurrent Mark                              38.020 / 59.720       38.020 / 59.720       38.020 / 59.720       38.020 / 59.720      ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]       Phase: Concurrent Mark Continue                      0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]       Phase: Concurrent Prepare Relocation Set             1.663 / 3.879         1.663 / 3.879         1.663 / 3.879         1.663 / 3.879       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]       Phase: Concurrent Process Non-Strong References      2.720 / 6.484         2.720 / 6.484         2.720 / 6.484         2.720 / 6.484       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]       Phase: Concurrent Relocate                          15.100 / 26.811       15.100 / 26.811       15.100 / 26.811       15.100 / 26.811      ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]       Phase: Concurrent Reset Relocation Set               0.052 / 0.151         0.052 / 0.151         0.052 / 0.151         0.052 / 0.151       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]       Phase: Concurrent Select Relocation Set              1.387 / 1.739         1.387 / 1.739         1.387 / 1.739         1.387 / 1.739       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]       Phase: Pause Mark End                                0.371 / 0.513         0.371 / 0.513         0.371 / 0.513         0.371 / 0.513       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]       Phase: Pause Mark Start                              0.607 / 0.776         0.607 / 0.776         0.607 / 0.776         0.607 / 0.776       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]       Phase: Pause Relocate Start                         10.034 / 13.753       10.034 / 13.753       10.034 / 13.753       10.034 / 13.753      ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Subphase: Concurrent Mark                              32.838 / 59.612       32.838 / 59.612       32.838 / 59.612       32.838 / 59.612      ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Subphase: Concurrent Mark Idle                          2.243 / 14.299        2.243 / 14.299        2.243 / 14.299        2.243 / 14.299      ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Subphase: Concurrent Mark Try Flush                     1.616 / 11.473        1.616 / 11.473        1.616 / 11.473        1.616 / 11.473      ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Subphase: Concurrent Mark Try Terminate                 2.032 / 14.304        2.032 / 14.304        2.032 / 14.304        2.032 / 14.304      ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Subphase: Concurrent References Enqueue                 0.006 / 0.007         0.006 / 0.007         0.006 / 0.007         0.006 / 0.007       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Subphase: Concurrent References Process                 2.188 / 5.858         2.188 / 5.858         2.188 / 5.858         2.188 / 5.858       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Subphase: Concurrent Weak Roots                         0.182 / 0.677         0.182 / 0.677         0.182 / 0.677         0.182 / 0.677       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Subphase: Concurrent Weak Roots JNIWeakHandles          0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Subphase: Concurrent Weak Roots StringTable             0.370 / 0.597         0.370 / 0.597         0.370 / 0.597         0.370 / 0.597       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Subphase: Concurrent Weak Roots VMWeakHandles           0.064 / 0.085         0.064 / 0.085         0.064 / 0.085         0.064 / 0.085       ms
[2018-07-22T13:18:09.872+0000][14][gc,stats    ]    Subphase: Pause Mark Try Complete                       0.001 / 0.004         0.001 / 0.004         0.001 / 0.004         0.001 / 0.004       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Remap TLABS                             0.001 / 0.001         0.001 / 0.001         0.001 / 0.001         0.001 / 0.001       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Retire TLABS                            0.004 / 0.005         0.004 / 0.005         0.004 / 0.005         0.004 / 0.005       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots                                   2.484 / 13.518        2.484 / 13.518        2.484 / 13.518        2.484 / 13.518      ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots ClassLoaderDataGraph              2.215 / 13.477        2.215 / 13.477        2.215 / 13.477        2.215 / 13.477      ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots CodeCache                         0.237 / 0.434         0.237 / 0.434         0.237 / 0.434         0.237 / 0.434       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots JNIHandles                        2.770 / 13.518        2.770 / 13.518        2.770 / 13.518        2.770 / 13.518      ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots JNIWeakHandles                    0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots JRFWeak                           0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots JVMTIExport                       0.001 / 0.001         0.001 / 0.001         0.001 / 0.001         0.001 / 0.001       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots JVMTIWeakExport                   0.001 / 0.001         0.001 / 0.001         0.001 / 0.001         0.001 / 0.001       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots Management                        0.001 / 0.001         0.001 / 0.001         0.001 / 0.001         0.001 / 0.001       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots ObjectSynchronizer                0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots Setup                             0.027 / 0.089         0.027 / 0.089         0.027 / 0.089         0.027 / 0.089       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots StringTable                       0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots SystemDictionary                  4.388 / 10.525        4.388 / 10.525        4.388 / 10.525        4.388 / 10.525      ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots Teardown                          0.001 / 0.003         0.001 / 0.003         0.001 / 0.003         0.001 / 0.003       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots Threads                           0.342 / 2.151         0.342 / 2.151         0.342 / 2.151         0.342 / 2.151       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots Universe                          1.618 / 3.905         1.618 / 3.905         1.618 / 3.905         1.618 / 3.905       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Roots VMWeakHandles                     0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Weak Roots                              0.000 / 0.002         0.000 / 0.002         0.000 / 0.002         0.000 / 0.002       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Weak Roots JFRWeak                      0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Weak Roots JNIWeakHandles               0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Weak Roots JVMTIWeakExport              0.001 / 0.001         0.001 / 0.001         0.001 / 0.001         0.001 / 0.001       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Weak Roots Setup                        0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Weak Roots StringTable                  0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Weak Roots SymbolTable                  0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Weak Roots Teardown                     0.001 / 0.001         0.001 / 0.001         0.001 / 0.001         0.001 / 0.001       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]    Subphase: Pause Weak Roots VMWeakHandles                0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:09.873+0000][14][gc,stats    ]      System: Java Threads                                      9 / 10                9 / 10                9 / 10                9 / 10          threads
[2018-07-22T13:18:09.873+0000][14][gc,stats    ] =========================================================================================================================================================
[2018-07-22T13:18:10.272+0000][13][gc,start    ] GC(3) Garbage Collection (Proactive)
[2018-07-22T13:18:10.273+0000][19][gc,phases   ] GC(3) Pause Mark Start 1.589ms
[2018-07-22T13:18:10.308+0000][13][gc,phases   ] GC(3) Concurrent Mark 33.980ms
[2018-07-22T13:18:10.308+0000][19][gc,phases   ] GC(3) Pause Mark End 0.202ms
[2018-07-22T13:18:10.310+0000][13][gc,phases   ] GC(3) Concurrent Process Non-Strong References 2.201ms
[2018-07-22T13:18:10.310+0000][13][gc,phases   ] GC(3) Concurrent Reset Relocation Set 0.027ms
[2018-07-22T13:18:10.310+0000][13][gc,phases   ] GC(3) Concurrent Destroy Detached Pages 0.000ms
[2018-07-22T13:18:10.312+0000][13][gc,phases   ] GC(3) Concurrent Select Relocation Set 1.833ms
[2018-07-22T13:18:10.314+0000][13][gc,phases   ] GC(3) Concurrent Prepare Relocation Set 1.417ms
[2018-07-22T13:18:10.326+0000][19][gc,phases   ] GC(3) Pause Relocate Start 12.547ms
[2018-07-22T13:18:10.360+0000][13][gc,phases   ] GC(3) Concurrent Relocate 33.471ms
[2018-07-22T13:18:10.360+0000][13][gc,load     ] GC(3) Load: 0.30/0.46/0.25
[2018-07-22T13:18:10.360+0000][13][gc,mmu      ] GC(3) MMU: 2ms/0.0%, 5ms/0.0%, 10ms/0.0%, 20ms/29.5%, 50ms/71.8%, 100ms/85.2%
[2018-07-22T13:18:10.360+0000][13][gc,marking  ] GC(3) Mark: 4 stripe(s), 6 proactive flush(es), 1 terminate flush(es), 0 completion(s), 0 continuation(s) 
[2018-07-22T13:18:10.360+0000][13][gc,reloc    ] GC(3) Relocation: Successful, 12M relocated
[2018-07-22T13:18:10.360+0000][13][gc,nmethod  ] GC(3) NMethods: 1981 registered, 0 unregistered
[2018-07-22T13:18:10.360+0000][13][gc,metaspace] GC(3) Metaspace: 40M used, 40M capacity, 40M committed, 42M reserved
[2018-07-22T13:18:10.360+0000][13][gc,ref      ] GC(3) Soft: 3096 encountered, 0 discovered, 0 enqueued
[2018-07-22T13:18:10.360+0000][13][gc,ref      ] GC(3) Weak: 3474 encountered, 783 discovered, 265 enqueued
[2018-07-22T13:18:10.360+0000][13][gc,ref      ] GC(3) Final: 65 encountered, 8 discovered, 0 enqueued
[2018-07-22T13:18:10.361+0000][13][gc,ref      ] GC(3) Phantom: 2778 encountered, 2771 discovered, 2769 enqueued
[2018-07-22T13:18:10.361+0000][13][gc,heap     ] GC(3)                Mark Start          Mark End        Relocate Start      Relocate End           High               Low         
[2018-07-22T13:18:10.361+0000][13][gc,heap     ] GC(3)  Capacity:      340M (68%)         340M (68%)         340M (68%)         348M (69%)         348M (69%)         340M (68%)    
[2018-07-22T13:18:10.361+0000][13][gc,heap     ] GC(3)   Reserve:       40M (8%)           40M (8%)           40M (8%)           40M (8%)           40M (8%)           40M (8%)     
[2018-07-22T13:18:10.361+0000][13][gc,heap     ] GC(3)      Free:      162M (32%)         162M (32%)         162M (32%)         434M (86%)         434M (86%)         154M (31%)    
[2018-07-22T13:18:10.361+0000][13][gc,heap     ] GC(3)      Used:      300M (60%)         300M (60%)         300M (60%)          28M (6%)          308M (61%)          28M (6%)     
[2018-07-22T13:18:10.361+0000][13][gc,heap     ] GC(3)      Live:         -                19M (4%)           19M (4%)           19M (4%)             -                  -          
[2018-07-22T13:18:10.361+0000][13][gc,heap     ] GC(3) Allocated:         -                 0M (0%)            0M (0%)           16M (3%)             -                  -          
[2018-07-22T13:18:10.361+0000][13][gc,heap     ] GC(3)   Garbage:         -               280M (56%)         280M (56%)           8M (2%)             -                  -          
[2018-07-22T13:18:10.361+0000][13][gc,heap     ] GC(3) Reclaimed:         -                  -                 0M (0%)          272M (54%)            -                  -          
[2018-07-22T13:18:10.361+0000][13][gc          ] GC(3) Garbage Collection (Proactive) 300M(60%)->28M(6%)
[2018-07-22T13:18:19.871+0000][14][gc,stats    ] === Garbage Collection Statistics =======================================================================================================================
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]                                                              Last 10s              Last 10m              Last 10h                Total
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]                                                              Avg / Max             Avg / Max             Avg / Max             Avg / Max
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]   Collector: Garbage Collection Cycle                     88.657 / 88.657       76.540 / 105.977      76.540 / 105.977      76.540 / 105.977     ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]  Contention: Mark Segment Reset Contention                     0 / 1                 0 / 2                 0 / 2                 0 / 2           ops/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]  Contention: Mark SeqNum Reset Contention                      0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]  Contention: Relocation Contention                             0 / 0                 0 / 2                 0 / 2                 0 / 2           ops/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Critical: Allocation Stall                              0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Critical: Allocation Stall                                  0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Critical: GC Locker Stall                               0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Critical: GC Locker Stall                                   0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]      Memory: Allocation Rate                                   0 / 6                29 / 108              29 / 108              29 / 108         MB/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]      Memory: Heap Used After Mark                            300 / 300             156 / 300             156 / 300             156 / 300         MB
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]      Memory: Heap Used After Relocation                       28 / 28               20 / 28               20 / 28               20 / 28          MB
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]      Memory: Heap Used Before Mark                           300 / 300             154 / 300             154 / 300             154 / 300         MB
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]      Memory: Heap Used Before Relocation                     300 / 300             156 / 300             156 / 300             156 / 300         MB
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]      Memory: Out Of Memory                                     0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]      Memory: Page Cache Flush                                  0 / 0                 0 / 0                 0 / 0                 0 / 0           MB/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]      Memory: Page Cache Hit L1                                 0 / 6                 8 / 54                8 / 54                8 / 54          ops/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]      Memory: Page Cache Hit L2                                 0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]      Memory: Page Cache Miss                                   0 / 4                 7 / 36                7 / 36                7 / 36          ops/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]      Memory: Undo Object Allocation Failed                     0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]      Memory: Undo Object Allocation Succeeded                  0 / 0                 0 / 2                 0 / 2                 0 / 2           ops/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]      Memory: Undo Page Allocation                              0 / 0                 0 / 2                 0 / 2                 0 / 2           ops/s
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]       Phase: Concurrent Destroy Detached Pages             0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]       Phase: Concurrent Mark                              33.980 / 33.980       37.010 / 59.720       37.010 / 59.720       37.010 / 59.720      ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]       Phase: Concurrent Mark Continue                      0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]       Phase: Concurrent Prepare Relocation Set             1.417 / 1.417         1.601 / 3.879         1.601 / 3.879         1.601 / 3.879       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]       Phase: Concurrent Process Non-Strong References      2.201 / 2.201         2.590 / 6.484         2.590 / 6.484         2.590 / 6.484       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]       Phase: Concurrent Relocate                          33.471 / 33.471       19.692 / 33.471       19.692 / 33.471       19.692 / 33.471      ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]       Phase: Concurrent Reset Relocation Set               0.027 / 0.027         0.046 / 0.151         0.046 / 0.151         0.046 / 0.151       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]       Phase: Concurrent Select Relocation Set              1.833 / 1.833         1.498 / 1.833         1.498 / 1.833         1.498 / 1.833       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]       Phase: Pause Mark End                                0.202 / 0.202         0.329 / 0.513         0.329 / 0.513         0.329 / 0.513       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]       Phase: Pause Mark Start                              1.589 / 1.589         0.853 / 1.589         0.853 / 1.589         0.853 / 1.589       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]       Phase: Pause Relocate Start                         12.547 / 12.547       10.662 / 13.753       10.662 / 13.753       10.662 / 13.753      ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Subphase: Concurrent Mark                              25.621 / 33.789       31.034 / 59.612       31.034 / 59.612       31.034 / 59.612      ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Subphase: Concurrent Mark Idle                          1.338 / 1.358         2.193 / 14.299        2.193 / 14.299        2.193 / 14.299      ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Subphase: Concurrent Mark Try Flush                     0.041 / 0.083         1.004 / 11.473        1.004 / 11.473        1.004 / 11.473      ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Subphase: Concurrent Mark Try Terminate                 0.811 / 1.363         1.935 / 14.304        1.935 / 14.304        1.935 / 14.304      ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Subphase: Concurrent References Enqueue                 0.008 / 0.008         0.006 / 0.008         0.006 / 0.008         0.006 / 0.008       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Subphase: Concurrent References Process                 0.579 / 0.579         1.786 / 5.858         1.786 / 5.858         1.786 / 5.858       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Subphase: Concurrent Weak Roots                         0.712 / 1.441         0.314 / 1.441         0.314 / 1.441         0.314 / 1.441       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Subphase: Concurrent Weak Roots JNIWeakHandles          0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Subphase: Concurrent Weak Roots StringTable             1.319 / 1.320         0.641 / 1.320         0.641 / 1.320         0.641 / 1.320       ms
[2018-07-22T13:18:19.871+0000][14][gc,stats    ]    Subphase: Concurrent Weak Roots VMWeakHandles           0.101 / 0.120         0.074 / 0.120         0.074 / 0.120         0.074 / 0.120       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Mark Try Complete                       0.000 / 0.000         0.001 / 0.004         0.001 / 0.004         0.001 / 0.004       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Remap TLABS                             0.001 / 0.001         0.001 / 0.001         0.001 / 0.001         0.001 / 0.001       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Retire TLABS                            0.010 / 0.010         0.005 / 0.010         0.005 / 0.010         0.005 / 0.010       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots                                   3.991 / 12.072        2.861 / 13.518        2.861 / 13.518        2.861 / 13.518      ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots ClassLoaderDataGraph              4.115 / 11.968        2.722 / 13.477        2.722 / 13.477        2.722 / 13.477      ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots CodeCache                         1.347 / 3.222         0.570 / 3.222         0.570 / 3.222         0.570 / 3.222       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots JNIHandles                        4.024 / 12.072        3.112 / 13.518        3.112 / 13.518        3.112 / 13.518      ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots JNIWeakHandles                    0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots JRFWeak                           0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots JVMTIExport                       0.001 / 0.001         0.001 / 0.001         0.001 / 0.001         0.001 / 0.001       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots JVMTIWeakExport                   0.001 / 0.001         0.001 / 0.001         0.001 / 0.001         0.001 / 0.001       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots Management                        0.376 / 0.750         0.095 / 0.750         0.095 / 0.750         0.095 / 0.750       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots ObjectSynchronizer                0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots Setup                             0.120 / 0.219         0.050 / 0.219         0.050 / 0.219         0.050 / 0.219       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots StringTable                       0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots SystemDictionary                  6.035 / 12.057        4.800 / 12.057        4.800 / 12.057        4.800 / 12.057      ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots Teardown                          0.001 / 0.003         0.001 / 0.003         0.001 / 0.003         0.001 / 0.003       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots Threads                           0.493 / 1.076         0.380 / 2.151         0.380 / 2.151         0.380 / 2.151       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots Universe                          0.003 / 0.003         1.214 / 3.905         1.214 / 3.905         1.214 / 3.905       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Roots VMWeakHandles                     0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Weak Roots                              0.001 / 0.003         0.001 / 0.003         0.001 / 0.003         0.001 / 0.003       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Weak Roots JFRWeak                      0.001 / 0.001         0.000 / 0.001         0.000 / 0.001         0.000 / 0.001       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Weak Roots JNIWeakHandles               0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Weak Roots JVMTIWeakExport              0.001 / 0.001         0.001 / 0.001         0.001 / 0.001         0.001 / 0.001       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Weak Roots Setup                        0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Weak Roots StringTable                  0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Weak Roots SymbolTable                  0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Weak Roots Teardown                     0.001 / 0.001         0.001 / 0.001         0.001 / 0.001         0.001 / 0.001       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]    Subphase: Pause Weak Roots VMWeakHandles                0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms
[2018-07-22T13:18:19.872+0000][14][gc,stats    ]      System: Java Threads                                     17 / 17               11 / 17               11 / 17               11 / 17          threads

小结

ZGC在如下几个阶段是concurrent的:

  • Marking
  • Relocation/Compaction
  • Relocation Set Selection
  • Reference Processing
  • JNI WeakRefs Cleaning

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