我正在尝试了解 G1 垃圾收集日志。您可能会在日志文件的顶部找到最重要的详细信息。堆最大容量为594M，但在jvm退出之前，最近的垃圾收集周期仅使用了351M。 Jvm 因 java.lang.OutOfMemoryError: Java heap space
[05:58:15.812][info][gc] Using G1
[05:58:15.831][info][gc,init] Version: 17.0.4.1+9-LTS (release)
[05:58:15.843][info][gc,init] CPUs: 6 total, 6 available
[05:58:15.844][info][gc,init] Memory: 1536M
[05:58:15.845][info][gc,init] Large Page Support: Disabled
[05:58:15.846][info][gc,init] NUMA Support: Disabled
[05:58:15.846][info][gc,init] Compressed Oops: Enabled (32-bit)
[05:58:15.846][info][gc,init] Heap Region Size: 1M
[05:58:15.847][info][gc,init] Heap Min Capacity: 594M
[05:58:15.847][info][gc,init] Heap Initial Capacity: 594M
[05:58:15.847][info][gc,init] Heap Max Capacity: 594M
[05:58:15.847][info][gc,init] Pre-touch: Disabled
[05:58:15.847][info][gc,init] Parallel Workers: 6
[05:58:15.847][info][gc,init] Concurrent Workers: 2
[05:58:15.849][info][gc,init] Concurrent Refinement Workers: 6
[05:58:15.849][info][gc,init] Periodic GC: Disabled
...
[06:01:10.226][info][gc ] GC(15) Pause Young (Normal) (G1 Evacuation Pause) 231M->69M(594M) 152.677ms
[06:01:10.228][info][gc,cpu ] GC(15) User=0.08s Sys=0.08s Real=0.16s
[06:01:13.502][info][gc,start ] GC(16) Pause Young (Normal) (G1 Evacuation Pause)
[06:01:13.504][info][gc,task ] GC(16) Using 6 workers of 6 for evacuation
[06:01:13.661][info][gc,phases ] GC(16) Pre Evacuate Collection Set: 2.0ms
[06:01:13.663][info][gc,phases ] GC(16) Merge Heap Roots: 1.4ms
[06:01:13.664][info][gc,phases ] GC(16) Evacuate Collection Set: 125.0ms
[06:01:13.669][info][gc,phases ] GC(16) Post Evacuate Collection Set: 25.1ms
[06:01:13.670][info][gc,phases ] GC(16) Other: 6.0ms
[06:01:13.671][info][gc,heap ] GC(16) Eden regions: 46->0(330)
[06:01:13.673][info][gc,heap ] GC(16) Survivor regions: 20->3(9)
[06:01:13.675][info][gc,heap ] GC(16) Old regions: 42->61
[06:01:13.678][info][gc,heap ] GC(16) Archive regions: 2->2
[06:01:13.681][info][gc,heap ] GC(16) Humongous regions: 7->7
[06:01:13.685][info][gc,metaspace] GC(16) Metaspace: 80929K(81856K)->80929K(81856K) NonClass: 70613K(71040K)->70613K(71040K) Class: 10316K(10816K)->10316K(10816K)
[06:01:13.689][info][gc ] GC(16) Pause Young (Normal) (G1 Evacuation Pause) 115M->71M(594M) 186.642ms
[06:01:13.691][info][gc,cpu ] GC(16) User=0.14s Sys=0.10s Real=0.19s
[06:01:20.646][info][gc,start ] GC(17) Pause Young (Normal) (G1 Evacuation Pause)
[06:01:20.648][info][gc,task ] GC(17) Using 6 workers of 6 for evacuation
[06:01:20.697][info][gc,phases ] GC(17) Pre Evacuate Collection Set: 0.2ms
[06:01:20.698][info][gc,phases ] GC(17) Merge Heap Roots: 3.4ms
[06:01:20.699][info][gc,phases ] GC(17) Evacuate Collection Set: 25.8ms
[06:01:20.700][info][gc,phases ] GC(17) Post Evacuate Collection Set: 17.2ms
[06:01:20.701][info][gc,phases ] GC(17) Other: 3.7ms
[06:01:20.701][info][gc,heap ] GC(17) Eden regions: 330->0(349)
[06:01:20.703][info][gc,heap ] GC(17) Survivor regions: 3->7(42)
[06:01:20.703][info][gc,heap ] GC(17) Old regions: 61->61
[06:01:20.704][info][gc,heap ] GC(17) Archive regions: 2->2
[06:01:20.704][info][gc,heap ] GC(17) Humongous regions: 7->7
[06:01:20.705][info][gc,metaspace] GC(17) Metaspace: 86881K(87808K)->86881K(87808K) NonClass: 75830K(76288K)->75830K(76288K) Class: 11050K(11520K)->11050K(11520K)
[06:01:20.707][info][gc ] GC(17) Pause Young (Normal) (G1 Evacuation Pause) 401M->74M(594M) 60.350ms
[06:01:20.708][info][gc,cpu ] GC(17) User=0.07s Sys=0.09s Real=0.07s
[06:01:28.403][info][gc,start ] GC(18) Pause Young (Normal) (G1 Evacuation Pause)
[06:01:28.404][info][gc,task ] GC(18) Using 6 workers of 6 for evacuation
[06:01:28.458][info][gc,phases ] GC(18) Pre Evacuate Collection Set: 1.8ms
[06:01:28.459][info][gc,phases ] GC(18) Merge Heap Roots: 1.5ms
[06:01:28.460][info][gc,phases ] GC(18) Evacuate Collection Set: 39.3ms
[06:01:28.462][info][gc,phases ] GC(18) Post Evacuate Collection Set: 10.1ms
[06:01:28.463][info][gc,phases ] GC(18) Other: 2.8ms
[06:01:28.463][info][gc,heap ] GC(18) Eden regions: 349->0(144)
[06:01:28.466][info][gc,heap ] GC(18) Survivor regions: 7->39(45)
[06:01:28.466][info][gc,heap ] GC(18) Old regions: 61->61
[06:01:28.468][info][gc,heap ] GC(18) Archive regions: 2->2
[06:01:28.468][info][gc,heap ] GC(18) Humongous regions: 11->11
[06:01:28.468][info][gc,metaspace] GC(18) Metaspace: 97955K(98944K)->97955K(98944K) NonClass: 85583K(86016K)->85583K(86016K) Class: 12371K(12928K)->12371K(12928K)
[06:01:28.468][info][gc ] GC(18) Pause Young (Normal) (G1 Evacuation Pause) 427M->110M(594M) 65.566ms
[06:01:28.469][info][gc,cpu ] GC(18) User=0.18s Sys=0.08s Real=0.07s
[06:01:30.412][info][gc,start ] GC(19) Pause Young (Normal) (G1 Evacuation Pause)
[06:01:30.412][info][gc,task ] GC(19) Using 6 workers of 6 for evacuation
[06:01:30.478][info][gc,phases ] GC(19) Pre Evacuate Collection Set: 1.0ms
[06:01:30.479][info][gc,phases ] GC(19) Merge Heap Roots: 1.4ms
[06:01:30.480][info][gc,phases ] GC(19) Evacuate Collection Set: 54.0ms
[06:01:30.480][info][gc,phases ] GC(19) Post Evacuate Collection Set: 8.6ms
[06:01:30.481][info][gc,phases ] GC(19) Other: 1.8ms
[06:01:30.481][info][gc,heap ] GC(19) Eden regions: 144->0(348)
[06:01:30.481][info][gc,heap ] GC(19) Survivor regions: 39->8(23)
[06:01:30.481][info][gc,heap ] GC(19) Old regions: 61->99
[06:01:30.481][info][gc,heap ] GC(19) Archive regions: 2->2
[06:01:30.484][info][gc,heap ] GC(19) Humongous regions: 13->11
[06:01:30.485][info][gc,metaspace] GC(19) Metaspace: 104263K(105216K)->104263K(105216K) NonClass: 91248K(91712K)->91248K(91712K) Class: 13015K(13504K)->13015K(13504K)
[06:01:30.487][info][gc ] GC(19) Pause Young (Normal) (G1 Evacuation Pause) 256M->117M(594M) 74.925ms
[06:01:30.487][info][gc,cpu ] GC(19) User=0.09s Sys=0.10s Real=0.08s
[06:01:35.850][info][gc,start ] GC(20) Pause Young (Concurrent Start) (Metadata GC Threshold)
[06:01:35.851][info][gc,task ] GC(20) Using 6 workers of 6 for evacuation
[06:01:35.897][info][gc,phases ] GC(20) Pre Evacuate Collection Set: 1.0ms
[06:01:35.898][info][gc,phases ] GC(20) Merge Heap Roots: 2.2ms
[06:01:35.898][info][gc,phases ] GC(20) Evacuate Collection Set: 31.2ms
[06:01:35.899][info][gc,phases ] GC(20) Post Evacuate Collection Set: 9.2ms
[06:01:35.900][info][gc,phases ] GC(20) Other: 2.8ms
[06:01:35.902][info][gc,heap ] GC(20) Eden regions: 335->0(343)
[06:01:35.903][info][gc,heap ] GC(20) Survivor regions: 8->13(45)
[06:01:35.903][info][gc,heap ] GC(20) Old regions: 99->99
[06:01:35.905][info][gc,heap ] GC(20) Archive regions: 2->2
[06:01:35.907][info][gc,heap ] GC(20) Humongous regions: 11->11
[06:01:35.907][info][gc,metaspace] GC(20) Metaspace: 111583K(112640K)->111583K(112640K) NonClass: 97634K(98176K)->97634K(98176K) Class: 13949K(14464K)->13949K(14464K)
[06:01:35.911][info][gc ] GC(20) Pause Young (Concurrent Start) (Metadata GC Threshold) 452M->122M(594M) 60.235ms
[06:01:35.912][info][gc,cpu ] GC(20) User=0.06s Sys=0.13s Real=0.06s
[06:01:35.913][info][gc ] GC(21) Concurrent Mark Cycle
[06:01:35.913][info][gc,marking ] GC(21) Concurrent Clear Claimed Marks
[06:01:35.915][info][gc,marking ] GC(21) Concurrent Clear Claimed Marks 1.447ms
[06:01:35.916][info][gc,marking ] GC(21) Concurrent Scan Root Regions
[06:01:35.954][info][gc,marking ] GC(21) Concurrent Scan Root Regions 38.159ms
[06:01:35.959][info][gc,marking ] GC(21) Concurrent Mark
[06:01:35.961][info][gc,marking ] GC(21) Concurrent Mark From Roots
[06:01:35.961][info][gc,task ] GC(21) Using 2 workers of 2 for marking
[06:01:36.052][info][gc,marking ] GC(21) Concurrent Mark From Roots 91.284ms
[06:01:36.053][info][gc,marking ] GC(21) Concurrent Preclean
[06:01:36.056][info][gc,marking ] GC(21) Concurrent Preclean 3.797ms
[06:01:36.060][info][gc,start ] GC(21) Pause Remark
[06:01:36.101][info][gc ] GC(21) Pause Remark 127M->126M(594M) 40.502ms
[06:01:36.101][info][gc,cpu ] GC(21) User=0.09s Sys=0.05s Real=0.04s
[06:01:36.108][info][gc,marking ] GC(21) Concurrent Mark 148.167ms
[06:01:36.111][info][gc,marking ] GC(21) Concurrent Rebuild Remembered Sets
[06:01:36.237][info][gc,marking ] GC(21) Concurrent Rebuild Remembered Sets 126.496ms
[06:01:36.254][info][gc,start ] GC(21) Pause Cleanup
[06:01:36.256][info][gc ] GC(21) Pause Cleanup 128M->128M(594M) 2.162ms
[06:01:36.256][info][gc,cpu ] GC(21) User=0.00s Sys=0.00s Real=0.00s
[06:01:36.259][info][gc,marking ] GC(21) Concurrent Cleanup for Next Mark
[06:01:36.264][info][gc,marking ] GC(21) Concurrent Cleanup for Next Mark 5.166ms
[06:01:36.266][info][gc ] GC(21) Concurrent Mark Cycle 352.545ms
[06:01:43.740][info][gc,start ] GC(22) Pause Young (Prepare Mixed) (G1 Evacuation Pause)
[06:01:43.741][info][gc,task ] GC(22) Using 6 workers of 6 for evacuation
[06:01:43.844][info][gc,phases ] GC(22) Pre Evacuate Collection Set: 0.5ms
[06:01:43.845][info][gc,phases ] GC(22) Merge Heap Roots: 4.1ms
[06:01:43.847][info][gc,phases ] GC(22) Evacuate Collection Set: 61.2ms
[06:01:43.849][info][gc,phases ] GC(22) Post Evacuate Collection Set: 30.9ms
[06:01:43.850][info][gc,phases ] GC(22) Other: 7.4ms
[06:01:43.851][info][gc,heap ] GC(22) Eden regions: 343->0(8)
[06:01:43.852][info][gc,heap ] GC(22) Survivor regions: 13->21(45)
[06:01:43.852][info][gc,heap ] GC(22) Old regions: 99->99
[06:01:43.852][info][gc,heap ] GC(22) Archive regions: 2->2
[06:01:43.853][info][gc,heap ] GC(22) Humongous regions: 10->10
[06:01:43.854][info][gc,metaspace] GC(22) Metaspace: 119561K(120704K)->119561K(120704K) NonClass: 104432K(104960K)->104432K(104960K) Class: 15128K(15744K)->15128K(15744K)
[06:01:43.858][info][gc ] GC(22) Pause Young (Prepare Mixed) (G1 Evacuation Pause) 464M->129M(594M) 118.686ms
[06:01:43.860][info][gc,cpu ] GC(22) User=0.07s Sys=0.13s Real=0.12s
[06:01:44.034][info][gc,start ] GC(23) Pause Young (Mixed) (G1 Evacuation Pause)
[06:01:44.037][info][gc,task ] GC(23) Using 6 workers of 6 for evacuation
[06:01:44.150][info][gc,phases ] GC(23) Pre Evacuate Collection Set: 0.5ms
[06:01:44.151][info][gc,phases ] GC(23) Merge Heap Roots: 2.5ms
[06:01:44.152][info][gc,phases ] GC(23) Evacuate Collection Set: 85.8ms
[06:01:44.153][info][gc,phases ] GC(23) Post Evacuate Collection Set: 20.3ms
[06:01:44.155][info][gc,phases ] GC(23) Other: 7.5ms
[06:01:44.155][info][gc,heap ] GC(23) Eden regions: 8->0(354)
[06:01:44.157][info][gc,heap ] GC(23) Survivor regions: 21->2(4)
[06:01:44.160][info][gc,heap ] GC(23) Old regions: 99->117
[06:01:44.160][info][gc,heap ] GC(23) Archive regions: 2->2
[06:01:44.173][info][gc,heap ] GC(23) Humongous regions: 10->10
[06:01:44.173][info][gc,metaspace] GC(23) Metaspace: 119798K(120896K)->119798K(120896K) NonClass: 104634K(105152K)->104634K(105152K) Class: 15164K(15744K)->15164K(15744K)
[06:01:44.179][info][gc ] GC(23) Pause Young (Mixed) (G1 Evacuation Pause) 137M->129M(594M) 145.364ms
[06:01:44.184][info][gc,cpu ] GC(23) User=0.04s Sys=0.08s Real=0.15s
[06:02:06.822][info][gc,start ] GC(24) Pause Young (Normal) (G1 Evacuation Pause)
[06:02:06.822][info][gc,task ] GC(24) Using 6 workers of 6 for evacuation
[06:02:06.969][info][gc,phases ] GC(24) Pre Evacuate Collection Set: 0.4ms
[06:02:06.970][info][gc,phases ] GC(24) Merge Heap Roots: 1.4ms
[06:02:06.970][info][gc,phases ] GC(24) Evacuate Collection Set: 124.4ms
[06:02:06.970][info][gc,phases ] GC(24) Post Evacuate Collection Set: 18.6ms
[06:02:06.970][info][gc,phases ] GC(24) Other: 2.7ms
[06:02:06.971][info][gc,heap ] GC(24) Eden regions: 354->0(153)
[06:02:06.972][info][gc,heap ] GC(24) Survivor regions: 2->37(45)
[06:02:06.976][info][gc,heap ] GC(24) Old regions: 117->117
[06:02:06.976][info][gc,heap ] GC(24) Archive regions: 2->2
[06:02:06.980][info][gc,heap ] GC(24) Humongous regions: 38->33
[06:02:06.983][info][gc,metaspace] GC(24) Metaspace: 126433K(127552K)->126433K(127552K) NonClass: 110590K(111104K)->110590K(111104K) Class: 15842K(16448K)->15842K(16448K)
[06:02:06.985][info][gc ] GC(24) Pause Young (Normal) (G1 Evacuation Pause) 511M->187M(594M) 162.976ms
[06:02:06.985][info][gc,cpu ] GC(24) User=0.24s Sys=0.19s Real=0.16s
[06:02:07.219][info][gc,start ] GC(25) Pause Young (Concurrent Start) (G1 Humongous Allocation)
[06:02:07.220][info][gc,task ] GC(25) Using 6 workers of 6 for evacuation
[06:02:07.427][info][gc,mmu ] GC(25) MMU target violated: 201.0ms (200.0ms/201.0ms)
[06:02:07.428][info][gc,phases ] GC(25) Pre Evacuate Collection Set: 0.3ms
[06:02:07.430][info][gc,phases ] GC(25) Merge Heap Roots: 1.0ms
[06:02:07.430][info][gc,phases ] GC(25) Evacuate Collection Set: 197.2ms
[06:02:07.431][info][gc,phases ] GC(25) Post Evacuate Collection Set: 6.4ms
[06:02:07.433][info][gc,phases ] GC(25) Other: 4.2ms
[06:02:07.433][info][gc,heap ] GC(25) Eden regions: 122->0(5)
[06:02:07.434][info][gc,heap ] GC(25) Survivor regions: 37->24(24)
[06:02:07.435][info][gc,heap ] GC(25) Old regions: 117->250
[06:02:07.436][info][gc,heap ] GC(25) Archive regions: 2->2
[06:02:07.436][info][gc,heap ] GC(25) Humongous regions: 120->120
[06:02:07.441][info][gc,metaspace] GC(25) Metaspace: 126443K(127552K)->126443K(127552K) NonClass: 110600K(111104K)->110600K(111104K) Class: 15843K(16448K)->15843K(16448K)
[06:02:07.445][info][gc ] GC(25) Pause Young (Concurrent Start) (G1 Humongous Allocation) 395M->394M(594M) 225.136ms
[06:02:07.445][info][gc,cpu ] GC(25) User=0.69s Sys=0.29s Real=0.22s
[06:02:07.446][info][gc ] GC(26) Concurrent Mark Cycle
[06:02:07.447][info][gc,marking ] GC(26) Concurrent Clear Claimed Marks
[06:02:07.448][info][gc,marking ] GC(26) Concurrent Clear Claimed Marks 0.986ms
[06:02:07.455][info][gc,marking ] GC(26) Concurrent Scan Root Regions
[06:02:07.532][info][gc,marking ] GC(26) Concurrent Scan Root Regions 77.048ms
[06:02:07.533][info][gc,marking ] GC(26) Concurrent Mark
[06:02:07.532][info][gc,start ] GC(27) Pause Young (Normal) (G1 Evacuation Pause)
[06:02:07.534][info][gc,marking ] GC(26) Concurrent Mark From Roots
[06:02:07.534][info][gc,task ] GC(27) Using 6 workers of 6 for evacuation
[06:02:07.535][info][gc,task ] GC(26) Using 2 workers of 2 for marking
[06:02:07.594][info][gc,phases ] GC(27) Pre Evacuate Collection Set: 1.5ms
[06:02:07.594][info][gc,phases ] GC(27) Merge Heap Roots: 0.6ms
[06:02:07.594][info][gc,phases ] GC(27) Evacuate Collection Set: 51.6ms
[06:02:07.595][info][gc,phases ] GC(27) Post Evacuate Collection Set: 4.1ms
[06:02:07.595][info][gc,phases ] GC(27) Other: 5.1ms
[06:02:07.596][info][gc,heap ] GC(27) Eden regions: 5->0(25)
[06:02:07.596][info][gc,heap ] GC(27) Survivor regions: 24->4(4)
[06:02:07.597][info][gc,heap ] GC(27) Old regions: 250->278
[06:02:07.597][info][gc,heap ] GC(27) Archive regions: 2->2
[06:02:07.597][info][gc,heap ] GC(27) Humongous regions: 173->173
[06:02:07.598][info][gc,metaspace] GC(27) Metaspace: 126444K(127552K)->126444K(127552K) NonClass: 110601K(111104K)->110601K(111104K) Class: 15843K(16448K)->15843K(16448K)
[06:02:07.598][info][gc ] GC(27) Pause Young (Normal) (G1 Evacuation Pause) 452M->455M(594M) 66.643ms
[06:02:07.599][info][gc,cpu ] GC(27) User=0.19s Sys=0.09s Real=0.07s
[06:02:07.626][info][gc,start ] GC(28) Pause Young (Normal) (G1 Evacuation Pause)
[06:02:07.627][info][gc,task ] GC(28) Using 6 workers of 6 for evacuation
[06:02:07.661][info][gc,phases ] GC(28) Pre Evacuate Collection Set: 0.5ms
[06:02:07.661][info][gc,phases ] GC(28) Merge Heap Roots: 1.6ms
[06:02:07.664][info][gc,phases ] GC(28) Evacuate Collection Set: 23.0ms
[06:02:07.666][info][gc,phases ] GC(28) Post Evacuate Collection Set: 6.4ms
[06:02:07.666][info][gc,phases ] GC(28) Other: 3.4ms
[06:02:07.667][info][gc,heap ] GC(28) Eden regions: 25->0(25)
[06:02:07.668][info][gc,heap ] GC(28) Survivor regions: 4->4(4)
[06:02:07.668][info][gc,heap ] GC(28) Old regions: 278->303
[06:02:07.670][info][gc,heap ] GC(28) Archive regions: 2->2
[06:02:07.670][info][gc,heap ] GC(28) Humongous regions: 173->173
[06:02:07.672][info][gc,metaspace] GC(28) Metaspace: 126445K(127552K)->126445K(127552K) NonClass: 110602K(111104K)->110602K(111104K) Class: 15843K(16448K)->15843K(16448K)
[06:02:07.673][info][gc ] GC(28) Pause Young (Normal) (G1 Evacuation Pause) 480M->480M(594M) 47.159ms
[06:02:07.674][info][gc,cpu ] GC(28) User=0.10s Sys=0.04s Real=0.04s
[06:02:07.713][info][gc,start ] GC(29) Pause Young (Normal) (G1 Evacuation Pause)
[06:02:07.716][info][gc,task ] GC(29) Using 6 workers of 6 for evacuation
[06:02:07.761][info][gc,phases ] GC(29) Pre Evacuate Collection Set: 0.7ms
[06:02:07.762][info][gc,phases ] GC(29) Merge Heap Roots: 1.0ms
[06:02:07.763][info][gc,phases ] GC(29) Evacuate Collection Set: 38.6ms
[06:02:07.764][info][gc,phases ] GC(29) Post Evacuate Collection Set: 3.8ms
[06:02:07.764][info][gc,phases ] GC(29) Other: 4.1ms
[06:02:07.767][info][gc,heap ] GC(29) Eden regions: 25->0(25)
[06:02:07.767][info][gc,heap ] GC(29) Survivor regions: 4->4(4)
[06:02:07.768][info][gc,heap ] GC(29) Old regions: 303->329
[06:02:07.768][info][gc,heap ] GC(29) Archive regions: 2->2
[06:02:07.769][info][gc,heap ] GC(29) Humongous regions: 173->173
[06:02:07.770][info][gc,metaspace] GC(29) Metaspace: 126447K(127552K)->126447K(127552K) NonClass: 110604K(111104K)->110604K(111104K) Class: 15843K(16448K)->15843K(16448K)
[06:02:07.771][info][gc ] GC(29) Pause Young (Normal) (G1 Evacuation Pause) 505M->506M(594M) 57.670ms
[06:02:07.771][info][gc,cpu ] GC(29) User=0.09s Sys=0.07s Real=0.06s
[06:02:07.786][info][gc,start ] GC(30) Pause Young (Normal) (G1 Humongous Allocation)
[06:02:07.787][info][gc,task ] GC(30) Using 6 workers of 6 for evacuation
[06:02:07.809][info][gc,phases ] GC(30) Pre Evacuate Collection Set: 0.6ms
[06:02:07.809][info][gc,phases ] GC(30) Merge Heap Roots: 1.4ms
[06:02:07.809][info][gc,phases ] GC(30) Evacuate Collection Set: 13.7ms
[06:02:07.810][info][gc,phases ] GC(30) Post Evacuate Collection Set: 3.0ms
[06:02:07.811][info][gc,phases ] GC(30) Other: 4.9ms
[06:02:07.811][info][gc,heap ] GC(30) Eden regions: 16->0(25)
[06:02:07.812][info][gc,heap ] GC(30) Survivor regions: 4->4(4)
[06:02:07.812][info][gc,heap ] GC(30) Old regions: 329->346
[06:02:07.813][info][gc,heap ] GC(30) Archive regions: 2->2
[06:02:07.815][info][gc,heap ] GC(30) Humongous regions: 173->173
[06:02:07.816][info][gc,metaspace] GC(30) Metaspace: 126450K(127552K)->126450K(127552K) NonClass: 110606K(111104K)->110606K(111104K) Class: 15843K(16448K)->15843K(16448K)
[06:02:07.817][info][gc ] GC(30) Pause Young (Normal) (G1 Humongous Allocation) 522M->523M(594M) 32.264ms
[06:02:07.819][info][gc,cpu ] GC(30) User=0.05s Sys=0.03s Real=0.04s
[06:02:07.819][info][gc,ergo ] Attempting full compaction
[06:02:07.821][info][gc,task ] GC(31) Using 6 workers of 6 for full compaction
[06:02:07.822][info][gc,start ] GC(31) Pause Full (G1 Compaction Pause)
[06:02:07.824][info][gc,phases,start] GC(31) Phase 1: Mark live objects
[06:02:08.020][info][gc,phases ] GC(31) Phase 1: Mark live objects 196.222ms
[06:02:08.021][info][gc,phases,start] GC(31) Phase 2: Prepare for compaction
[06:02:08.038][info][gc,phases ] GC(31) Phase 2: Prepare for compaction 16.989ms
[06:02:08.040][info][gc,phases,start] GC(31) Phase 3: Adjust pointers
[06:02:08.111][info][gc,phases ] GC(31) Phase 3: Adjust pointers 70.781ms
[06:02:08.112][info][gc,phases,start] GC(31) Phase 4: Compact heap
[06:02:08.136][info][gc,phases ] GC(31) Phase 4: Compact heap 24.822ms
[06:02:08.158][info][gc,heap ] GC(31) Eden regions: 0->0(68)
[06:02:08.159][info][gc,heap ] GC(31) Survivor regions: 4->0(4)
[06:02:08.161][info][gc,heap ] GC(31) Old regions: 346->294
[06:02:08.163][info][gc,heap ] GC(31) Archive regions: 2->2
[06:02:08.164][info][gc,heap ] GC(31) Humongous regions: 173->59
[06:02:08.164][info][gc,metaspace ] GC(31) Metaspace: 126450K(127552K)->125580K(127552K) NonClass: 110606K(111104K)->109899K(111104K) Class: 15843K(16448K)->15681K(16448K)
[06:02:08.166][info][gc ] GC(31) Pause Full (G1 Compaction Pause) 523M->351M(594M) 343.997ms
[06:02:08.168][info][gc,cpu ] GC(31) User=1.19s Sys=0.11s Real=0.35s
[06:02:08.169][info][gc,ergo ] Attempting maximum full compaction clearing soft references
[06:02:08.170][info][gc,task ] GC(32) Using 6 workers of 6 for full compaction
[06:02:08.171][info][gc,start ] GC(32) Pause Full (G1 Compaction Pause)
[06:02:08.172][info][gc,phases,start] GC(32) Phase 1: Mark live objects
[06:02:08.382][info][gc,phases ] GC(32) Phase 1: Mark live objects 209.907ms
[06:02:08.384][info][gc,phases,start] GC(32) Phase 2: Prepare for compaction
[06:02:08.415][info][gc,phases ] GC(32) Phase 2: Prepare for compaction 31.599ms
[06:02:08.416][info][gc,phases,start] GC(32) Phase 3: Adjust pointers
[06:02:08.476][info][gc,phases ] GC(32) Phase 3: Adjust pointers 59.899ms
[06:02:08.479][info][gc,phases,start] GC(32) Phase 4: Compact heap
[06:02:08.574][info][gc,phases ] GC(32) Phase 4: Compact heap 95.300ms
[06:02:08.589][info][gc,heap ] GC(32) Eden regions: 0->0(72)
[06:02:08.590][info][gc,heap ] GC(32) Survivor regions: 0->0(4)
[06:02:08.592][info][gc,heap ] GC(32) Old regions: 294->286
[06:02:08.592][info][gc,heap ] GC(32) Archive regions: 2->2
[06:02:08.594][info][gc,heap ] GC(32) Humongous regions: 59->59
[06:02:08.595][info][gc,metaspace ] GC(32) Metaspace: 125580K(127552K)->124605K(127488K) NonClass: 109899K(111104K)->109098K(111040K) Class: 15681K(16448K)->15506K(16448K)
[06:02:08.596][info][gc ] GC(32) Pause Full (G1 Compaction Pause) 351M->343M(594M) 424.729ms
[06:02:08.598][info][gc,cpu ] GC(32) User=1.51s Sys=0.15s Real=0.43s
[06:02:08.602][info][gc,marking ] GC(26) Concurrent Mark From Roots 1068.450ms
[06:02:08.603][info][gc,marking ] GC(26) Concurrent Mark Abort
[06:02:08.605][info][gc ] GC(26) Concurrent Mark Cycle 1158.585ms
有人可以解释一下为什么会发生这种情况吗？为什么 jvm 没有使用所有可用的堆空间？
最佳答案
假设以下场景:您有 1GB 堆空间，当前分配的是 800 MB。
现在您的代码尝试执行新字节[256 * 1024 * 1024]。 gc 将尝试释放一些额外的内存，但会失败，并且会抛出 OOME，而不分配内存 – 一直有 200 MB 的可用内存。
您可能会在日志中找到有问题的语句，J9 JVM 会将 OOM 的确切原因写入 javacore 文件，但 GC 日志不会告诉您这方面的任何信息。
关于java - JVM 未使用所有可用堆空间，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/75425299/