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HI, I like to know can I increase the memory of the JVM depending on my application.If yes how can I increase the JVM memory? And how can I know the size of JVM?
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To increase the Application Server JVM heap sizeNavigate to the JVM options. Edit the -Xmx256m option. This option sets the JVM heap size. Set the -Xmx256m option to a higher value, such as Xmx1024m.
When a Java program needs memory, it requests this memory from the JVM. If there is no memory left, then the JVM will attempt to free some memory by using the garbage collector. The garbage collector will try to release memory that is no longer required to run the program back to the JVM.
Java objects reside in an area called the heap. The heap is created when the JVM starts up and may increase or decrease in size while the application runs. When the heap becomes full, garbage is collected. During the garbage collection objects that are no longer used are cleared, thus making space for new objects.
Therefore we recommended that physical memory availability for each JVM be 4096 MB;0.5 GB is for JVM allocation and 512 MB is for overhead. This simplified calculation means that a 64-bit system with 16 GB physical memory can run 3 JVMs.
When starting the JVM, two parameters can be adjusted to suit your memory needs :
-Xms<size> specifies the initial Java heap size and
-Xmx<size> the maximum Java heap size.
http://www.rgagnon.com/javadetails/java-0131.html
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