Configuration Options Related Topics
This page displays runtime data about the JRockit VM that is running the current WebLogic Server instance. It also displays information about the memory and processors on the computer that is hosting the VM.
The page is available only when you run a server with the JRockit Virtual Machine (VM).
To view additional data about the VM, such as how long it spends in a specific method, use the JRockit Management Console. You can also use the JRockit Management Console to send email notifications when specific VM events occur.
You cannot change the VM's operating parameters while the VM is active. Instead, use the startup options that are described in the JRockit documentation.
Name | Description |
---|---|
Total Nursery Size |
The amount (in bytes) of memory that is currently allocated to the nursery. The nursery is the area of the Java heap that the VM allocates to most objects. Instead of garbage collecting the entire heap, generational garbage collectors focus on the nursery. Because most objects die young, most of the time it is sufficient to garbage collect only the nursery and not the entire heap. If you are not using a generational garbage collector, the
nursery size is MBean Attribute: |
Max Heap Size |
MBean Attribute: |
Gc Algorithm |
The type of garbage collector (GC) that the Virtual Machine is using. JRockit provides the following types of GCs:
MBean Attribute: |
Total Garbage Collection Count |
The number of garbage collection runs that have occurred since the Virtual Machine was started. MBean Attribute: |
GCHandles Compaction |
Indicates whether the VM's garbage collector compacts the Java heap. Usually the heap is scattered throughout available memory. A garbage collector that compacts the heap defragments the memory space in addition to deleting unused objects. MBean Attribute: |
Concurrent |
Indicates whether the VM's garbage collector runs in a separate Java thread concurrently with other Java threads. MBean Attribute: |
Generational |
Indicates whether the VM's garbage collector uses a nursery space. A nursery is the area of the Java heap that the VM allocates to most objects. Instead of garbage collecting the entire heap, generational garbage collectors focus on the nursery. Because most objects die young, most of the time it is sufficient to garbage collect only the nursery and not the entire heap. MBean Attribute: |
Incremental |
Indicates whether the VM's garbage collector collects (increments) garbage as it scans the memory space and dumps the garbage at the end of its cycle. With a non-incremental garbage collector, garbage is dumped as soon as it is encountered. MBean Attribute: |
Parallel |
Indicates whether the VM's garbage collector is able to run in parallel on multiple processors if multiple processors are available. MBean Attribute: |
Number Of Processors |
The number of processors on the Virtual Machine's host computer.
If this is not a Symmetric Multi Processor (SMP) system, the value
will be MBean Attribute: |
Total Number Of Threads |
The number of Java threads (daemon and non-daemon) that are currently running in the Virtual Machine across all processors. MBean Attribute: |
Number Of Daemon Threads |
The number of daemon Java threads currently running in the Virtual Machine across all processors. MBean Attribute: |
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