<div dir="ltr"><pre style="color:rgb(0,0,0);white-space:pre-wrap"><pre style="white-space:pre-wrap">Hi,</pre></pre><pre style="color:rgb(0,0,0);white-space:pre-wrap">  I am running ZGC in production(Deployed in k8s) with following settings</pre><pre style="color:rgb(0,0,0);white-space:pre-wrap">-Xms4000m -Xmx4000m -XX:ConcGCThreads=2 -XX:-UseDynamicNumberOfGCThreads -XX:+UseZGC -XX:-ZProactive -XX:ZAllocationSpikeTolerance=3 -XX:ZCollectionInterval=60</pre><pre style="color:rgb(0,0,0);white-space:pre-wrap">Occasionally encounter a long Pause Mark Start time(the longest pause time  is 5s)<br></pre><pre style="color:rgb(0,0,0);white-space:pre-wrap">Here are some GC logs blow</pre><pre style="color:rgb(0,0,0);white-space:pre-wrap">[2022-07-12T10:52:52.242+0800][10][info][gc,init] Initializing The Z Garbage Collector<br>[2022-07-12T10:52:52.242+0800][10][info][gc,init] Version: 17.0.3+8-LTS-111 (release)<br>[2022-07-12T10:52:52.242+0800][10][info][gc,init] NUMA Support: Disabled<br>[2022-07-12T10:52:52.242+0800][10][info][gc,init] CPUs: 64 total, 4 available<br>[2022-07-12T10:52:52.242+0800][10][info][gc,init] Memory: 10240M<br>[2022-07-12T10:52:52.243+0800][10][info][gc,init] Large Page Support: Disabled<br>[2022-07-12T10:52:52.243+0800][10][info][gc,init] GC Workers: 2/3 (static)<br>[2022-07-12T10:52:52.243+0800][10][info][gc,init] Address Space Type: Contiguous/Unrestricted/Complete<br>[2022-07-12T10:52:52.243+0800][10][info][gc,init] Address Space Size: 64000M x 3 = 192000M<br>[2022-07-12T10:52:52.243+0800][10][info][gc,init] Heap Backing File: /memfd:java_heap<br>[2022-07-12T10:52:52.243+0800][10][info][gc,init] Heap Backing Filesystem: tmpfs (0x1021994)<br>[2022-07-12T10:52:52.243+0800][10][info][gc,init] Min Capacity: 4000M<br>[2022-07-12T10:52:52.243+0800][10][info][gc,init] Initial Capacity: 4000M<br>[2022-07-12T10:52:52.243+0800][10][info][gc,init] Max Capacity: 4000M<br>[2022-07-12T10:52:52.243+0800][10][info][gc,init] Medium Page Size: 32M<br>[2022-07-12T10:52:52.243+0800][10][info][gc,init] Pre-touch: Enabled<br>[2022-07-12T10:52:52.243+0800][10][info][gc,init] Available space on backing filesystem: N/A<br>[2022-07-12T10:52:52.243+0800][10][info][gc,init] Uncommit: Implicitly Disabled (-Xms equals -Xmx)<br>[2022-07-12T10:52:55.014+0800][10][info][gc,init] Runtime Workers: 3<br>[2022-07-12T10:52:55.014+0800][10][info][gc     ] Using The Z Garbage Collector<br><br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ] === Garbage Collection Statistics =======================================================================================================================<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]                                                              Last 10s              Last 10m              Last 10h                Total<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]                                                              Avg / Max             Avg / Max             Avg / Max             Avg / Max<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]   Collector: Garbage Collection Cycle                      0.000 / 0.000       215.897 / 245.004     199.964 / 281.004     198.501 / 327.779     ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]  Contention: Mark Segment Reset Contention                     0 / 0                 0 / 3                 0 / 13                0 / 17          ops/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]  Contention: Mark SeqNum Reset Contention                      0 / 0                 0 / 2                 0 / 3                 0 / 4           ops/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Critical: Allocation Stall                                  0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Critical: Allocation Stall                              0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Critical: GC Locker Stall                                   0 / 0                 0 / 1                 0 / 1                 0 / 1           ops/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Critical: GC Locker Stall                               0.000 / 0.000         0.001 / 0.001         0.022 / 0.138         0.032 / 0.197       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Critical: Relocation Stall                                  0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Critical: Relocation Stall                              0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]      Memory: Allocation Rate                                 106 / 124             109 / 240             100 / 308             104 / 352         MB/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]      Memory: Out Of Memory                                     0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]      Memory: Page Cache Flush                                  0 / 0                 0 / 0                 0 / 0                 0 / 0           MB/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]      Memory: Page Cache Hit L1                                53 / 62               54 / 76               49 / 94               51 / 176         ops/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]      Memory: Page Cache Hit L2                                 0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]      Memory: Page Cache Hit L3                                 0 / 0                 0 / 0                 0 / 1                 0 / 123         ops/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]      Memory: Page Cache Miss                                   0 / 0                 0 / 0                 0 / 0                 0 / 1           ops/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]      Memory: Uncommit                                          0 / 0                 0 / 0                 0 / 0                 0 / 0           MB/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]      Memory: Undo Object Allocation Failed                     0 / 0                 0 / 94                0 / 189               0 / 438         ops/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]      Memory: Undo Object Allocation Succeeded                  0 / 0                 0 / 90                0 / 571               0 / 571         ops/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]      Memory: Undo Page Allocation                              0 / 1                 0 / 3                 0 / 7                 0 / 9           ops/s<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]       Phase: Concurrent Mark                               0.000 / 0.000       162.242 / 191.178     149.779 / 233.888     149.319 / 253.310     ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]       Phase: Concurrent Mark Continue                      0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]       Phase: Concurrent Mark Free                          0.000 / 0.000         0.001 / 0.003         0.001 / 0.035         0.001 / 0.035       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]       Phase: Concurrent Process Non-Strong References      0.000 / 0.000        40.077 / 43.167       36.932 / 73.540       35.951 / 73.540      ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]       Phase: Concurrent Relocate                           0.000 / 0.000         9.764 / 13.321        9.670 / 18.334        9.656 / 64.541      ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]       Phase: Concurrent Reset Relocation Set               0.000 / 0.000         0.246 / 0.377         0.234 / 0.385         0.228 / 0.459       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]       Phase: Concurrent Select Relocation Set              0.000 / 0.000         2.843 / 3.684         2.670 / 4.496         2.647 / 9.518       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]       Phase: Pause Mark End                                0.000 / 0.000         0.036 / 0.059         0.030 / 0.080         0.029 / 0.105       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]       Phase: Pause Mark Start                              0.000 / 0.000         0.040 / 0.050         0.057 / 17.923        0.085 / 116.781     ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]       Phase: Pause Relocate Start                          0.000 / 0.000         0.022 / 0.032         0.021 / 0.060         0.021 / 0.063       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Classes Purge                      0.000 / 0.000         1.484 / 2.016         1.290 / 2.861         1.230 / 3.239       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Classes Unlink                     0.000 / 0.000        34.848 / 38.008       32.338 / 68.815       31.461 / 68.815      ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Mark                               0.000 / 0.000       158.162 / 187.147     146.016 / 230.654     145.542 / 250.339     ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Mark Try Flush                     0.000 / 0.000         0.208 / 0.536         0.197 / 79.168        0.179 / 79.168      ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Mark Try Terminate                 0.000 / 0.000         0.468 / 1.076         0.455 / 5.019         0.449 / 32.389      ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Subphase: Concurrent References Enqueue                 0.000 / 0.000         0.001 / 0.008         0.002 / 0.015         0.002 / 0.031       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Subphase: Concurrent References Process                 0.000 / 0.000         0.417 / 0.662         0.297 / 0.828         0.305 / 4.058       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Roots ClassLoaderDataGraph         0.000 / 0.000         0.421 / 1.062         0.393 / 1.062         0.392 / 1.062       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Roots CodeCache                    0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Roots JavaThreads                  0.000 / 0.000         2.863 / 3.649         2.609 / 4.023         2.636 / 4.221       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Roots OopStorageSet                0.000 / 0.000         0.101 / 0.148         0.094 / 0.172         0.092 / 0.748       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Weak Roots OopStorageSet           0.000 / 0.000         2.895 / 3.442         2.633 / 3.805         2.588 / 4.245       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]    Subphase: Pause Mark Try Complete                       0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.003 / 0.006       ms<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ]      System: Java Threads                                      0 / 0               204 / 227             173 / 227             167 / 227         threads<br>[2022-07-13T14:18:33.036+0800][18][info][gc,stats    ] =========================================================================================================================================================<br>[2022-07-13T14:18:37.836+0800][16][info][gc,task     ] GC(2822) Using 2 workers<br>[2022-07-13T14:18:38.568+0800][23][info][gc,phases   ] GC(2822) Pause Mark Start 731.329ms<br>[2022-07-13T14:18:38.568+0800][23][info][safepoint   ] Safepoint "ZMarkStart", Time since last: 33682417078 ns, Reaching safepoint: 78660 ns, At safepoint: 731509582 ns, Total: 731588242 ns<br>[2022-07-13T14:18:38.763+0800][16][info][gc,phases   ] GC(2822) Concurrent Mark 195.357ms<br>[2022-07-13T14:18:38.763+0800][23][info][gc,phases   ] GC(2822) Pause Mark End 0.037ms<br>[2022-07-13T14:18:38.763+0800][23][info][safepoint   ] Safepoint "ZMarkEnd", Time since last: 195457277 ns, Reaching safepoint: 59774 ns, At safepoint: 69617 ns, Total: 129391 ns<br>[2022-07-13T14:18:38.763+0800][16][info][gc,phases   ] GC(2822) Concurrent Mark Free 0.002ms<br>[2022-07-13T14:18:38.807+0800][16][info][gc,phases   ] GC(2822) Concurrent Process Non-Strong References 43.503ms<br>[2022-07-13T14:18:38.807+0800][16][info][gc,phases   ] GC(2822) Concurrent Reset Relocation Set 0.266ms<br>[2022-07-13T14:18:38.811+0800][16][info][gc,phases   ] GC(2822) Concurrent Select Relocation Set 3.787ms<br>[2022-07-13T14:18:38.811+0800][23][info][gc,phases   ] GC(2822) Pause Relocate Start 0.022ms<br>[2022-07-13T14:18:38.811+0800][23][info][safepoint   ] Safepoint "ZRelocateStart", Time since last: 47720139 ns, Reaching safepoint: 71865 ns, At safepoint: 50103 ns, Total: 121968 ns<br>[2022-07-13T14:18:38.823+0800][16][info][gc,phases   ] GC(2822) Concurrent Relocate 12.090ms<br>[2022-07-13T14:18:38.823+0800][16][info][gc,load     ] GC(2822) Load: 17.47/17.79/16.25<br>[2022-07-13T14:18:38.823+0800][16][info][gc,mmu      ] GC(2822) MMU: 2ms/0.0%, 5ms/0.0%, 10ms/0.0%, 20ms/0.0%, 50ms/0.0%, 100ms/0.0%<br>[2022-07-13T14:18:38.823+0800][16][info][gc,marking  ] GC(2822) Mark: 2 stripe(s), 2 proactive flush(es), 1 terminate flush(es), 0 completion(s), 0 continuation(s) <br>[2022-07-13T14:18:38.823+0800][16][info][gc,marking  ] GC(2822) Mark Stack Usage: 32M<br>[2022-07-13T14:18:38.823+0800][16][info][gc,nmethod  ] GC(2822) NMethods: 23051 registered, 1360 unregistered<br>[2022-07-13T14:18:38.823+0800][16][info][gc,metaspace] GC(2822) Metaspace: 113M used, 114M committed, 516M reserved<br>[2022-07-13T14:18:38.823+0800][16][info][gc,ref      ] GC(2822) Soft: 1059 encountered, 271 discovered, 0 enqueued<br>[2022-07-13T14:18:38.823+0800][16][info][gc,ref      ] GC(2822) Weak: 16086 encountered, 1352 discovered, 0 enqueued<br>[2022-07-13T14:18:38.823+0800][16][info][gc,ref      ] GC(2822) Final: 30 encountered, 2 discovered, 0 enqueued<br>[2022-07-13T14:18:38.823+0800][16][info][gc,ref      ] GC(2822) Phantom: 290 encountered, 250 discovered, 1 enqueued<br>[2022-07-13T14:18:38.823+0800][16][info][gc,reloc    ] GC(2822) Small Pages: 1852 / 3704M, Empty: 698M, Relocated: 10M, In-Place: 0<br>[2022-07-13T14:18:38.823+0800][16][info][gc,reloc    ] GC(2822) Medium Pages: 2 / 64M, Empty: 32M, Relocated: 0M, In-Place: 0<br>[2022-07-13T14:18:38.823+0800][16][info][gc,reloc    ] GC(2822) Large Pages: 0 / 0M, Empty: 0M, Relocated: 0M, In-Place: 0<br>[2022-07-13T14:18:38.823+0800][16][info][gc,reloc    ] GC(2822) Forwarding Usage: 3M<br>[2022-07-13T14:18:38.823+0800][16][info][gc          ] GC(2822) Garbage Collection (High Usage) 3768M(94%)->238M(6%)<br>[2022-07-13T14:18:42.813+0800][23][info][safepoint   ] Safepoint "Cleanup", Time since last: 4000282554 ns, Reaching safepoint: 1161862 ns, At safepoint: 32230 ns, Total: 1194092 ns<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ] === Garbage Collection Statistics =======================================================================================================================<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]                                                              Last 10s              Last 10m              Last 10h                Total<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]                                                              Avg / Max             Avg / Max             Avg / Max             Avg / Max<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]   Collector: Garbage Collection Cycle                    987.238 / 987.238     256.494 / 987.238     200.744 / 987.238     198.781 / 987.238     ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]  Contention: Mark Segment Reset Contention                     0 / 0                 0 / 3                 0 / 13                0 / 17          ops/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]  Contention: Mark SeqNum Reset Contention                      0 / 0                 0 / 2                 0 / 3                 0 / 4           ops/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Critical: Allocation Stall                                  0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Critical: Allocation Stall                              0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Critical: GC Locker Stall                                   0 / 0                 0 / 1                 0 / 1                 0 / 1           ops/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Critical: GC Locker Stall                               0.000 / 0.000         0.001 / 0.001         0.022 / 0.138         0.032 / 0.197       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Critical: Relocation Stall                                  0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Critical: Relocation Stall                              0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]      Memory: Allocation Rate                                 105 / 128             109 / 240             100 / 308             104 / 352         MB/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]      Memory: Out Of Memory                                     0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]      Memory: Page Cache Flush                                  0 / 0                 0 / 0                 0 / 0                 0 / 0           MB/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]      Memory: Page Cache Hit L1                                51 / 64               54 / 76               49 / 94               51 / 176         ops/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]      Memory: Page Cache Hit L2                                 0 / 0                 0 / 0                 0 / 0                 0 / 0           ops/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]      Memory: Page Cache Hit L3                                 1 / 16                0 / 16                0 / 16                0 / 123         ops/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]      Memory: Page Cache Miss                                   0 / 0                 0 / 0                 0 / 0                 0 / 1           ops/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]      Memory: Uncommit                                          0 / 0                 0 / 0                 0 / 0                 0 / 0           MB/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]      Memory: Undo Object Allocation Failed                     1 / 14                0 / 94                0 / 189               0 / 438         ops/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]      Memory: Undo Object Allocation Succeeded                 10 / 109               0 / 109               0 / 571               0 / 571         ops/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]      Memory: Undo Page Allocation                              0 / 4                 0 / 4                 0 / 7                 0 / 9           ops/s<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]       Phase: Concurrent Mark                             195.357 / 195.357     163.985 / 195.357     149.824 / 233.888     149.336 / 253.310     ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]       Phase: Concurrent Mark Continue                      0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]       Phase: Concurrent Mark Free                          0.002 / 0.002         0.001 / 0.003         0.001 / 0.035         0.001 / 0.035       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]       Phase: Concurrent Process Non-Strong References     43.503 / 43.503       40.257 / 43.503       36.939 / 73.540       35.954 / 73.540      ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]       Phase: Concurrent Relocate                          12.090 / 12.090        9.887 / 13.321        9.672 / 18.334        9.657 / 64.541      ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]       Phase: Concurrent Reset Relocation Set               0.266 / 0.266         0.247 / 0.377         0.234 / 0.385         0.228 / 0.459       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]       Phase: Concurrent Select Relocation Set              3.787 / 3.787         2.893 / 3.787         2.671 / 4.496         2.647 / 9.518       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]       Phase: Pause Mark End                                0.037 / 0.037         0.036 / 0.059         0.030 / 0.080         0.029 / 0.105       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]       Phase: Pause Mark Start                            731.329 / 731.329      38.529 / 731.329       0.782 / 731.329       0.344 / 731.329     ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]       Phase: Pause Relocate Start                          0.022 / 0.022         0.022 / 0.032         0.021 / 0.060         0.021 / 0.063       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Classes Purge                      1.826 / 1.826         1.502 / 2.016         1.290 / 2.861         1.230 / 3.239       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Classes Unlink                    38.001 / 38.001       35.014 / 38.008       32.344 / 68.815       31.464 / 68.815      ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Mark                             190.810 / 191.151     159.881 / 191.151     146.060 / 230.654     145.558 / 250.339     ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Mark Try Flush                     0.259 / 0.548         0.211 / 0.548         0.197 / 79.168        0.179 / 79.168      ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Mark Try Terminate                 0.545 / 1.065         0.472 / 1.076         0.456 / 5.019         0.449 / 32.389      ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Subphase: Concurrent References Enqueue                 0.009 / 0.009         0.002 / 0.009         0.002 / 0.015         0.002 / 0.031       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Subphase: Concurrent References Process                 0.338 / 0.338         0.412 / 0.662         0.297 / 0.828         0.305 / 4.058       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Roots ClassLoaderDataGraph         0.376 / 0.659         0.419 / 1.062         0.393 / 1.062         0.392 / 1.062       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Roots CodeCache                    0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.000 / 0.000       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Roots JavaThreads                  3.345 / 3.622         2.889 / 3.649         2.610 / 4.023         2.636 / 4.221       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Roots OopStorageSet                0.103 / 0.110         0.101 / 0.148         0.094 / 0.172         0.092 / 0.748       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Subphase: Concurrent Weak Roots OopStorageSet           2.779 / 2.780         2.889 / 3.442         2.633 / 3.805         2.588 / 4.245       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]    Subphase: Pause Mark Try Complete                       0.000 / 0.000         0.000 / 0.000         0.000 / 0.000         0.003 / 0.006       ms<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ]      System: Java Threads                                    226 / 234             205 / 234             173 / 234             167 / 234         threads<br>[2022-07-13T14:18:43.036+0800][18][info][gc,stats    ] =========================================================================================================================================================<br></pre><pre style="color:rgb(0,0,0);white-space:pre-wrap">In my opinion, this stage is very light. What can cause this phenomenon</pre><pre style="color:rgb(0,0,0);white-space:pre-wrap"><pre style="white-space:pre-wrap">Thanks!</pre></pre></div>