This is cheat sheet regarding JAVA memory tunning.
Please refer to <
How to Tune Java Garbage Collection> for details.
JVM Memory Tuning parameters
| Parameter | Description |
|---|
| -Xms1000m | Heap area size when starting JVM |
| -Xmx1000m | Maximum heap area size |
| -XX:NewRatio=2 | Ratio of New area and Old area |
| -XX:NewSize=1000000 | New area size |
| -XX:SurvivorRatio=2 | Ratio of Eden area and Survivor area |
| -XX:PermSize=1000000 | Permanent area size |
| -XX:MaxPermSize=1000000 | Max permanent area size |
| -XX:+HeapDumpOnOutOfMemoryError | Create heap dump on OOM error |
| -XX:HeapDumpPath=/tmp/a.log | Heap dump location. |
| -XX:OnOutOfMemoryError=/killparent.sh | Actions after an OOM occurs. |
Enable Verbose GC log
| Parameter | Description |
|---|
| -verbose:gc | Print each GC. |
| -XX:+PrintGCDetails | Print additional information. |
| -Xloggc:/tmp/gc.log | Log location of GC |
| -XX:+PrintGCTimeStamps | Add a time stamp at the start of each collection. |
This is a useful resource for developers looking to improve Java application performance. Understanding memory tuning parameters can help optimize resource usage, troubleshoot issues, and maintain more stable applications.
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