JaCoLine - Viewing Historical Command Line #13361
| Analysis Date | JDK | Operating System | CPU Architecture | Debug JVM? |
|---|---|---|---|---|
| 2026-06-25 | OpenJDK21 | Linux | x86 | N |
Results
Switches Identified
Switch Analysis
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ms | <size> | set initial Java heap size | 13g | |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| mx | <size> | set maximum Java heap size | 13g | |
| 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. Obsoleted in OpenJDK24. | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| SoftMaxHeapSize | size_t | Soft limit for maximum heap size (in bytes) | 0 | 11g |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ConcGCThreads | uint | Number of threads concurrent gc will use | 0 | 4 |
| 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) | 256m |
| 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 |
|---|---|---|---|---|
| MaxDirectMemorySize | uint64_t | Maximum total size of NIO direct-buffer allocations. Ignored if not explicitly set. |
0 in range(0, max_jlong) | 1g |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ZUncommit | boolean | Uncommit unused memory | true | true |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ZUncommitDelay | int | Uncommit memory if it has been unused for the specified amount of time (in seconds) |
5 * 60 | 300 |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| ExitOnOutOfMemoryError | boolean | JVM exits on the first occurrence of an out-of-memory error thrown from JVM |
false | true |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| HeapDumpOnOutOfMemoryError | boolean | Dump heap to file when java.lang.OutOfMemoryError is thrown from JVM |
false | true |
| Analysis | OK | |||
| Name | Type | Description | Default Value | Your Value |
|---|---|---|---|---|
| HeapDumpPath | string | When HeapDumpOnOutOfMemoryError is on, the path (filename or directory) of the dump file (defaults to java_pid<pid>.hprof in the working directory) |
nullptr | /home/work/log/heapdump.hprof |
| 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. |
gc*:file=/home/work/log/gc.log:time,level,tags:filecount=5,filesize=100m | |
| Analysis | OK | |||