Main memory

Saturation state

Message: EXC0870 CORE SATURATION LEVEL=i

where i is a digit in the range 0 through 3 indicating the saturation level.

Level	Effects on system	Operator action
0	Normal system processing	None
1	No new batch jobs will be started.	None
2	No new batch jobs will be started.	None
3	No new batch jobs will be started. Requests for resident memory pages will be met only for particularly important system jobs.	Jobs can be aborted by the operator

Desaturation

Level	Effects on system	Operator action
2 ... 0	Desaturation Batch jobscan be started again once Level=0 has been reached.	None

Saturation prevention measures

The occurrence of a saturation condition indicates that the system is overloaded. If main memory requirements cannot be permanently reduced, the system needs more main memory. In the case of a VM2000 guest system, the VM2000 administrator will need to increase the MINIMAL-MEMORY-SIZE. You are not advised to set a larger NEW-MEMORY-SIZE while leaving the MINIMAL-MEMORY-SIZE unchanged.

In the case of SUs x86, it is the BS2000 memory that is affected. The proportion of overall memory that this represents can be set via X2000.

Examples for the reduction of system main memory requirements

• Reduce the DAB cache areas in main memory

• Reduce the number of resident catalog buffers for specific pubsets or make the buffers pageable

• Export unused pubsets

• Unload applications which have made user pages resident

• Unload large applications or programs

• Considerably reduce the number of tasks in the system