博文
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| Heap size |
The allocation of memory for the JVM is specified using -X options when starting Resin (the exact options may depend upon the JVM that you are using, the examples here are for the Sun JVM).
| JVM option passed to Resin | Meaning |
|---|---|
| -Xms | initial java heap size |
| -Xmx | maximum java heap size |
| -Xmn | the size of the heap for the young generation |
| Resin startup with heap memory options |
unix> bin/httpd.sh -Xmn100M -Xms500M -Xmx500M win> bin/httpd.exe -Xmn100M -Xms500M -Xmx500M install win service> bin/httpd.exe -Xmn100M -Xms500M -Xmx500M -install |
It is good practice with server-side Java applications like Resin to set the minimum and maximum heap sizes to the same value.
For efficient garbage collection, the value should be lower than the value.
Heap size does not determine the amount of memory your process uses
If you monitor your java process with an OS tool like top or taskmanager, you may see the amount of memory you use exceed the amount you have specified for -Xmx. -Xmx limits the java heap size, java will allocate memory for other things, including a stack for each thread. It is not unusual for the total memory consumption of the VM to exceed the value of -Xmx.
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