JaCoLine - Viewing Historical Command Line #11137
| Analysis Date | JDK | Operating System | CPU Architecture | Debug JVM? |
|---|---|---|---|---|
| 2024-06-11 | OpenJDK21 | Linux | x86 | N |
Results
Switches Identified
Switch Analysis
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ms | <size> | set initial Java heap size | 45g | |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| mx | <size> | set maximum Java heap size | 45g | |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ConcGCThreads | uint | Number of threads concurrent gc will use | 0 | 8 |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| MaxDirectMemorySize | uint64_t | Maximum total size of NIO direct-buffer allocations. Ignored if not explicitly set. |
0 in range(0, max_jlong) | 8g |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| UseZGC | boolean | Use the Z garbage collector | false | true |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ZGenerational | boolean | Use the generational version of ZGC | false | true |
| Analysis | This switch will be removed in the future. It will be Deprecated in OpenJDK23. | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| UseDynamicNumberOfGCThreads | boolean | Dynamically choose the number of threads up to a maximum of ParallelGCThreads parallel collectors will use for garbage collection work |
true | false |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ZProactive | boolean | Enable proactive GC cycles | true | false |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ZUncommit | boolean | Uncommit unused memory | true | false |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ZAllocationSpikeTolerance | double | Allocation spike tolerance factor | 2.0 | 2 |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ZCollectionInterval | double | Force GC at a fixed time interval (in seconds). Backwards compatible alias for ZCollectionIntervalMajor |
0 | 60 |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| SafepointTimeout | boolean | Time out and warn or fail after SafepointTimeoutDelay milliseconds if failed to reach safepoint |
false | true |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| SafepointTimeoutDelay | int | Delay in milliseconds for option SafepointTimeout | 10000 in range(0, max_intx LP64_ONLY(/MICROUNITS)) | 300 |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| UseBiasedLocking | boolean | (Deprecated) Enable biased locking in JVM | false | false |
| Analysis | This switch was removed after OpenJDK17. Your analysis was for OpenJDK21 | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| UseCounterDecay | boolean | Adjust recompilation counters | true | false |
| Analysis | This switch will be removed in the future. It will be Obsoleted in OpenJDK22. Expired in OpenJDK23. | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| AutoBoxCacheMax | int | Sets max value cached by the java.lang.Integer autobox cache | 128 in range(0, max_jint) | 20000 |
| 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 |
|---|---|---|---|---|
| MetaspaceSize | size_t | Initial threshold (in bytes) at which a garbage collection is done to reduce Metaspace usage |
NOT_LP64(16 * M) LP64_ONLY(21 * M) | 128m |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| MaxMetaspaceSize | size_t | Maximum size of Metaspaces (in bytes) | max_uintx | 512m |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value | ||||
|---|---|---|---|---|---|---|---|---|
| ReservedCodeCacheSize | int | Reserved code cache size (in bytes) - maximum code cache size |
|
240M | ||||
| Analysis | OK | |||||||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ExplicitGCInvokesConcurrent | boolean | A System.gc() request invokes a concurrent collection; (effective only when using concurrent collectors) |
false | true |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| OmitStackTraceInFastThrow | boolean | Omit backtraces for some 'hot' exceptions in optimized code | true | false |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| log | <opts> | Configure or enable logging with the Java Virtual Machine (JVM) unified logging framework. Use -Xlog:help for details. |
::async | |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| loggc | <file> | log GC status to a file with time stamps. This option is deprecated and may be removed in a future release. It is replaced by -Xlog:gc:<file>. |
::gc-my-app.log | |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| PrintGCDetails | boolean | Print more details at garbage collection. Deprecated, use -Xlog:gc* instead. |
false | true |
| Analysis | OK | |||