How To Fix CSM_VMC064 - Maximale Häufigkeit der Full GC-Läufe einzelner Virtual Machines

SAP Error Message - Details

• Message type: E = Error

• Message class: CSM_VMC - Messages for VM Container Monitoring

• Message number: 064

• Message text: Maximale Häufigkeit der Full GC-Läufe einzelner Virtual Machines

Was verursacht dieses Problem?

Each of the active virtual machines in the VM Container has reserved
memory for its Java heap. The size of this memory is bound to specified
limits when the VM is started and cannot be changed at runtime. Once
this memory is used up, the VM activates the garbage collection (GC)
procedure, in which memory allocated but no longer needed is freed up
again. There are two stages to this procedure - partial and full
garbage collection. The partial GC cleans up dedicated memory areas only
and uses much less resources. It is therefore much faster than the full
GC. This partial GC is performed more frequently and is part of normal
operation. The full GC is started when the permanent memory usage
(objects that have survived several partial GCs) exceeds specified
limits. Full GC empties all the objects from the Java heap that are no
longer needed, and therefore reduces the amount of memory occupied to
the smallest possible amount. This process involves a complex analysis
of the Java object references and takes a long time and uses up alot of
VM resources.

Systemantwort

This monitor displays the maximum frequency of GC runs in one of the
active virtual machines in the VM Container. This figure is usually
dominated by the frequency of the partial GCs, and can have values up to
100 [1/min].

Wie behebe ich diesen Fehler?

For a more detailed picture of Java memory states in the VM Container
this monitor should always be considered together with the values of the
full GC rate monitor and with the monitors for memory usage.
You can find more information about the memory classes in the VM
Container in the online documentation under
<DS:KENO.001560AA0E081DEB91E241270609CAF7>Memory Management in the VM
Container</>.

Vorgehensweise für Systemadministratoren

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