The following entries are the general information of SM52 VMC in the SAP system.
VMC Status and Number of VMs
- VMC is active
- The VM Container is loaded and is running.
- VMC is inactive
- The VM Container is loaded but not running.
- VMC is not loaded
- No VM Container set up in the system configuration
Status of the Shared Memory Garbage Collection
- Not active
- No SGC is currently activated.
- Active, VMs should contribute
- An SGC is activated and is waiting for the (optional) memory release from one or more VMs.
- Active, VMs must contribute
- An SGC is activated and is waiting for the mandatory memory release from one or more VMs.
- Active, release of all non-referenced objects
- An SGC is activated and releases memory.
VMC Memory Consumption
- Shared Pool
- Total size of shared pool (contains all in the following named objects)
- Global Classes
- Classes in the Shared Memory of the VMC (shared classes)
- Global Programs
- JIT-compiled classes in the Shared Memory of the VMC (shared programs)
- Global Data
- Data defined cross-VM ( Shared Closures)
- Other Global Data
- Copy-Only Data of Shared Closures
- Global Admin Data
- Unique Description, Messages
- Other Global Data
- All remaining objects in the shared memory of the VMC (for example, shared locks)
- Total
- Total consumption of all four memory classes
- Memory Usage
- Percentage usage of the shared pool through allocated memory (in brackets you can see what percentage of the shared pool is actually used)
Table of VMC
- No.:
- Internal number of VM (0, 1, 2, …)
- Time
- Time when the VM began processing the last request
- WP
- Number of the work process to which the VM is currently assigned (0, 1, 2, … or empty if it is not assigned)
- Type
- Template: The VM is used as a template for instantiating further VMs.
- Servlet: The VM processes HTTP requests.
- RFC: The VM processes RFC requests.
- Auto Java: The VM handles internal VMC services periodically.
- Java Test: The VM carries out specific internal tests.
- State
- Starting Up: The VM is just being instantiated and initialized.
- Stopping: The VM is bring stopped and then deleted.
- Running: The VM is just processing a program.
- Waiting: The VM is processing a program, but is just waiting for a resource.
- In Pool: The VM is free for processing a program.
- Sleeping: The VM has been moved by the program or by the VMC into a in temporary wait state.
- Wants to Lock: The VM is waiting for a resource to be locked for it.
- User
- Name of user that started the program just being processed.
- Program
- Name of the application program just being processed.
- CPU
- Processor time used up to now by the VM. Time format is hours:minutes:seconds:microseconds (hhhh:mm:ss.mmmm)
- MB
- Memory space in megabytes currently occupied by the VM.
- Debugging
- Not active: The VM is not currently connected to a debugger.
- Started: The VM is being prepared for the connection to a debugger.
- Waiting: The VM is waiting for the connection to a debugger.
- Active: The VM is currently connected to a debugger.
- Stopping: The VM is closing the connection to the debugger.
- Port
- Number of the port through which the VM is connected to the debugger (8000, 8001, …)
- SGC State
- Neutral: The VM has no shared memory to release.
- Should Contribute: The VM, if possible, should release memory.
- Must Contribute: The VM absolutely has to release memory.
- Contributing: The VM is releasing memory right now.
- Has Contributed: The VM has released memory.
