JaCoLine - Viewing Historical Command Line #3566
| Analysis Date | JDK | Operating System | CPU Architecture | Debug JVM? |
|---|---|---|---|---|
| 2021-12-18 | OpenJDK8 | Linux | x86 | N |
Results
Switches Identified
Switch Analysis
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| PrintGCDetails | boolean | Print more details at garbage collection | false | true |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| NumberOfGCLogFiles | int | Number of gclog files in rotation (default: 0, no rotation) |
0 | 10 |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| log | <opts> | control JVM logging, use -Xlog:help for details | ::pagesize | |
| Analysis | This switch is not available until OpenJDK9. Your analysis was for OpenJDK8 | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| loggc | <file> | log GC status to a file with time stamps | ::A:/gc.log | |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| UseLargePages | boolean | Use large page memory | false | true |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| UseLargePagesInMetaspace | boolean | Use large page memory in metaspace. Only used if UseLargePages is enabled. |
false | true |
| Analysis | This switch will be removed in the future. It will be Deprecated in OpenJDK15. Obsoleted in OpenJDK16. Expired in OpenJDK17. | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| UseLargePagesIndividualAllocation | boolean | Allocate large pages individually for better affinity | false | true |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| AlwaysPreTouch | boolean | Force all freshly committed pages to be pre-touched | false | true |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| UnlockExperimentalVMOptions | boolean | Enable normal processing of flags relating to experimental features |
false | true |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| DisableExplicitGC | boolean | Ignore calls to System.gc() | false | true |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| AggressiveOpts | boolean | Enable aggressive optimizations - see arguments.cpp | false | true |
| Analysis | This switch will be removed in the future. It will be Deprecated in OpenJDK11. Obsoleted in OpenJDK12. Expired in OpenJDK13. | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ParallelRefProcEnabled | boolean | Enable parallel reference processing whenever possible | false | true |
| Analysis | This switch will be removed in the future. It will be Deprecated in OpenJDK26. Obsoleted in OpenJDK27. Expired in OpenJDK28. | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| UseStringDeduplication | boolean | Use string deduplication | false | true |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| CompilerThreadPriority | int | The native priority at which compiler threads should run (-1 means no change) |
-1 | 1 |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| UseShenandoahGC | boolean | Use the Shenandoah garbage collector | false | true |
| Analysis | This switch is not available until OpenJDK12. Your analysis was for OpenJDK8 | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ShenandoahGCHeuristics | string | GC heuristics to use. This fine-tunes the GC mode selected, by choosing when to start the GC, how much to process on each cycle, and what other features to automatically enable. Possible values are: adaptive - adapt to maintain the given amount of free heap at all times, even during the GC cycle; static - trigger GC when free heap falls below the threshold; aggressive - run GC continuously, try to evacuate everything; compact - run GC more frequently and with deeper targets to free up more memory. |
adaptive | compact |
| Analysis | This switch is not available until OpenJDK11. Your analysis was for OpenJDK8 | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ms | <size> | set initial Java heap size | 4096m | |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| mx | <size> | set maximum Java heap size | 4096m | |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ss | <size> | set java thread stack size | 2m | |
| Analysis | OK | |||