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VM Overview: Table of VMsLocate this document in the navigation structure

Use

You can see the list of the VMs currently instantiated, and the following information for each VM:

Column Name

Meaning and Possible Values

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

Usage type of the VM; possible values:

  • 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

Current status of the VM; possible values:

  • 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

Current debugging status of the VM; possible values:

  • 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

Status of the VM in the event of a shared garbage collection, currently with the addition "waiting", in case the VM itself is waiting for memory to be freed up. The following statuses are possible:

  • 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.

There are also additional table columns, which by default are not displayed. They can however be displayed by using the context menu function Show of the ALV Control.

Column Name

Meaning and Possible Values

Information

An icon signals a special VM status (see below).

Locks

Number of locks held by the VM.

Cross-VM locks are used within the VM Container to synchronize global data. To minimize collisions there are various locks for the individual application areas, and you can tell these locks apart by their names.

If a lock is just about to be set, its name is displayed. If a lock has already been set, its name is already displayed.

Trace

On or Off, depending on whether trace flags are activated.

LWP

Number of the work process the VM was last assigned to ("Last Work Process"; 0, 1, 2, and so on). This information is useful if, for example, you are searching for the associated developer trace (dev_w0, dev_w1,… ) (see Developer Traces).

Name of the Lock

Name of the lock last requested. If multiple locks are held, you can see the other locks in the technical information of the VM ( Start of the navigation path Edit Next navigation step VM Next navigation step Technical Info End of the navigation path). Here you can see:

  • mtx info a lock already set

  • locking mtx info a requested, but not yet set, lock.

Since locks by their nature are cursory (unless the VM is gets stuck), this information can seldom be seen.

The first three columns provide more details of the specific state the VM temporarily has. The specific status of a VM is indicated by a background color in its table row in a standard table layout.

A light blue colored row signals that debugging has been activated for this VM, which means the VM can be connected to a debugger with the next request. The icon appears in the additional column Info.

A yellow colored row means that trace flags have been activated for this VM. The icon appears in the additional column Info, and On or Off appears in the additional column Trace.

A red colored table row means that this VM is holding at least one lock (mutex flag), that is, it exclusively makes use of one or more VMC resources. The icon appears in the additional column Info, and On or Off appears in the additional column Trace.