AMPSUBS parameter

Number of active offload subtasks

Summary

Default value

None

Parameter type

System

Where set

On User 0's parameter line or reset by system manager

Related products

All

Introduced

Model 204 V6.1 or earlier

Description

The number of active subtasks in a Model 204 multiprocessing online configuration (IBM z/OS systems only)

The value of AMPSUBS must be less than or equal to the value of the NMPSUBS parameter, which determines the number of subtasks attached during initialization. The AMPSUBS parameter allows the system manager to adjust the number of active offload subtasks without bringing down the online.

If AMPSUBS is less than NMPSUBS, the extra subtasks remain attached but do not perform offloaded work. If AMPSUBS is set to 0, the main task performs all the work and multiprocessing is effectively turned off.

For more information about tuning MP, refer to Multiprocessing (MP/204).