gtpo1m2rOperations

ZCNIS-Change Instruction-Stream Parameters

Use this command to change the values used in a tightly coupled processor. You can change the operating mode for future initial program loads (IPLs) or you can set the values of the tuning parameters used by the I-stream scheduler.

Requirements and Restrictions

None.

Format




MP
updates keypoint I to generate a multiprocessing environment for the next IPL. This is the normal operating mode for the TPF system and allows the TPF system to use all the available I-streams.
Note:
You cannot specify this parameter if the processor has only one I-stream or if only one I-stream can be active on the processor at a time. In addition, you cannot specify this parameter if the program test vehicle (PTV) is active because PTV is restricted to run only in uniprocessing mode.

UP
updates keypoint I to generate a uniprocessing environment for the next IPL. This forces the TPF system to run as though there was only one I-stream available. Use this mode only for trace functions, such as PTV, that do not operate correctly in MP mode.

DISplay
displays the current state of the environment.

MAXq
defines the maximum combined size of the CROSS, READY, and INPUT lists allowed before the I-stream scheduler overrides its normal algorithm. The value assigned to this parameter should be larger than any value reached during the normal steady state operation of the TPF system.
Note:
Enter ZSTAT U to display the current size of the CROSS, READY, and INPUT lists.

REAct
specifies how rapidly the I-stream scheduler reacts to a change in work load composition; for example, starting a utility. Lower values cause the schedule to react faster.

Attention: If you change this value from the default value that is set by the TPF system, make the changes in small increments and observe the results carefully. If the value assigned to this parameter is too large, the TPF system makes corrections very slowly. If the value assigned to this parameter is too small, the TPF system may overreact to work load changes and prevent I-streams from balancing correctly.

value
is the hexadecimal value, from X'00'-X'7FFFFFFF', to assign to the MAXQ or REACT parameter.

Additional Information

Examples

The current state of the environment is displayed in the following example.

+---------------------------------------------------------------------------------------------+
|User:   ZCNIS DISP                                                                           |
|                                                                                             |
|System: CNIS0004I 13.39.10 CURRENTLY RUNNING IN UP MODE                                      |
|        CNIS0062I 13.39.10 I-STREAM SCHEDULER CONSTANTS: REACT-00001000, MAXQ-00000064       |
+---------------------------------------------------------------------------------------------+

Related Information

See TPF Concepts and Structures and TPF System Generation for more information about I-streams, uniprocessors, and multiprocessors.