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
- Online help information is available for this command. To display
the help information, enter one of the following:
ZCNIS HELP
ZCNIS ?
- In a high performance option (HPO) loosely coupled complex, the ZCNIS
command sets the operating mode and scheduler parameters for the current
processor, but not for the other processors in the complex.
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.