what is the meaning of Java heap size in XI server ?? In what way it is different from system RAM ?? On what basis we will select heap size ?? What is the importance of java heap size ??
The Java heap is where the objects of a Java program live. It is a repository for live objects, dead objects, and free memory. When an object can no longer be reached from any pointer in the running program, it is considered "garbage" and ready for collection.
The JVM heap size determines how often and how long the VM spends collecting garbage. If you set a large heap size, full garbage collection is slower, but it occurs less frequently. If you set your heap size in accordance with your memory needs, full garbage collection is faster, but occurs more frequently.
-Xms<size> initial Java heap size
-Xmx<size> maximum Java heap size
These parameters which are defined in Configtool determine how much Java heap can be used of the Total RAM.
The max Java heap size should be with in the RAM so that it does not under go Paging.
Bluesky
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