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| -Xlog: | |
| // selections | |
| codecache+sweep*=trace, | |
| class+unload, // TraceClassUnloading | |
| class+load, // TraceClassLoading | |
| os+thread, | |
| safepoint, // TraceSafepoint | |
| gc*, // PrintGCDetails | |
| gc+stringdedup=debug, // PrintStringDeduplicationStatistics | |
| gc+ergo*=trace, |
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| -XX:+PrintGCDetails \ // gc* | |
| -XX:+PrintGCApplicationStoppedTime \ // safepoint | |
| -XX:+PrintGCApplicationConcurrentTime \ // safepoint | |
| -XX:+PrintGCCause \ // default output | |
| -XX:+PrintGCID \ // default output | |
| -XX:+PrintTenuringDistribution \ // gc+age*=trace | |
| -XX:+PrintGCDateStamps \ // :time,tags,level | |
| -XX:+UseGCLogFileRotation \ // :filecount=5,filesize=10M | |
| -XX:NumberOfGCLogFiles=5 \ // :filecount=5,filesize=10M | |
| -XX:GCLogFileSize=10M \ // :filecount=5,filesize=10M |
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| $ java -Xlog:gc+heap=debug -cp . G1GCDemo01 | |
| [0.004s][debug][gc,heap] Minimum heap 8388608 Initial heap 268435456 Maximum heap | |
| hello, g1gc! | |
| [12.263s][debug][gc,heap] GC(0) Heap before GC invocations=0 (full 0): | |
| [12.265s][debug][gc,heap] GC(0) garbage-first heap | |
| [12.265s][debug][gc,heap] GC(0) region size 2048K, 1 young (2048K) | |
| [12.265s][debug][gc,heap] GC(0) Metaspace used 3678K | |
| [12.265s][debug][gc,heap] GC(0) class space used 300K | |
| [12.280s][debug][gc,heap] GC(0) Uncommittable regions after shrink: 124 | |
| [0.122s][debug][gc, ergo, refine] Initial Refinement Zones: green: 23, yellow: |
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| $ java -Xlog:gc+heap=debug -cp . G1GCDemo01 | |
| [0.004s][debug][gc,heap] Minimum heap 8388608 Initial heap 268435456 Maximum heap | |
| hello, g1gc! | |
| [12.263s][debug][gc,heap] GC(0) Heap before GC invocations=0 (full 0): | |
| [12.265s][debug][gc,heap] GC(0) garbage-first heap | |
| [12.265s][debug][gc,heap] GC(0) region size 2048K, 1 young (2048K) | |
| [12.265s][debug][gc,heap] GC(0) Metaspace used 3678K | |
| [12.265s][debug][gc,heap] GC(0) class space used 300K | |
| [12.280s][debug][gc,heap] GC(0) Uncommittable regions after shrink: 124 | |
| [0.122s][debug][gc, ergo, refine] Initial Refinement Zones: green: 23, yellow: |
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| CMSDumpAtPromotionFailure, | |
| CMSPrintEdenSurvivorChunks, | |
| GlLogLevel, | |
| G1PrintHeapRegions, | |
| G1PrintRegionLivenessInfo, | |
| G1SummarizeConcMark, | |
| G1SummarizeRSetStats, | |
| G1TraceConcRefinement, | |
| G1TraceEagerReclaimHumongousObjects, | |
| G1TraceStringSymbolTableScrubbing, |
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| java -XX:+PrintGCDetails -version | |
| [0.001s][warning][gc] -XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead. |
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| java -XX:+PrintGCDetails -version | |
| [0.001s][warning][gc] -XX:+PrintGCDetails is deprecated. Will use -Xlog:gc* instead. |
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| [2022-06-15T19:54:01.529+0800][0.001s][5235][info ][os,thread] Thread attached | |
| [2022-06-15T19:54:01.529+0800][0.001s][5235][debug][os,thread] Thread 5237 stack... | |
| [2022-06-15T19:54:01.529+0800][0.001s][5235][debug][perf,datacreation] |
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| $ java -Xlog:all=debug:stdout:level,tags,time,uptime,pid -version | |
| [2022-06-15T19:54:01.529+0800][0.001s][5235][info ][os,thread] Thread attached | |
| [2022-06-15T19:54:01.529+0800][0.001s][5235][debug][os,thread] Thread 5237 stack... | |
| [2022-06-15T19:54:01.529+0800][0.001s][5235][debug][perf,datacreation] |
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| $ java -Xlog:all=debug:stdout:level,tags,time,uptime,pid -version | |
| [2022-06-15T19:54:01.529+0800][0.001s][5235][info ][os,thread] Thread attached | |
| [2022-06-15T19:54:01.529+0800][0.001s][5235][debug][os,thread] Thread 5237 stack... | |
| [2022-06-15T19:54:01.529+0800][0.001s][5235][debug][perf,datacreation] |