CA IDMS zIIP enabled but DCPROFIL shows 0 zIIP Engines
Article ID: 12893
Updated On:
Products
Issue/Introduction
CA IDMS zIIP processing is enabled but on the DCPROFIL task shows:
zIIP ENGINES: 0000
Is there anything else needed to anable zIIP in IDMS?
Environment
Component: CA IDMS
Cause
DCPROFIL will always show the number of zIIP processors available even when zIIP processing is turned off in IDMS. If the number of zIIP processors is 0 it means there are no zIIP processors online. You need to ensure at least one zIIP processors is online for IDMS to make use of it. To check the status of processors use the z/OS console command:
DISPLAY M=CPU
This will show you the status of general and zIIP processors:
General processors online will be marked with a +
zIIP processors online will be marked with a +I
General processors offline will be marked with a -
zIIP processors offline will be marked with a -I
Resolution
If the zIIP processors are offline in the operating system, configure them to be online.
To enable the use of zIIP processors in IDMS you need to specify zIIP=Y in the PARM statement of the JCL when starting IDMS.
After the CV is up, use command DCMT VARY ZIIP ON/OFF to enable/disable zIIP.
In addition some modules need to be loaded form an APF authorized library. The list of modules is documented in the section titled zIIP Eligibility.
The easiest way to implement this is to APF authorize the whole CAGJLOAD library. Note that not every load library in the STEPLIB and CDMSLIB need to be authorized. Only the libraries containing the nucleus modules.
Once zIIP processors are online and zIIP is activated in IDMS, DCPROFIL will display:
TAPE: CAGJJ0 OPERATING SYSTEM: z/OS ZIIP=Y
zIIP ENGINES: 0001
The following PTFs are currently needed in 19.0 to solve problems with zIIP:
RO92366
RO92321
RO85457
RO83713
RO82708
RO80760
RO93622
RO96677
SO06651
Note that ZIIP is of more benefit on CVs that more execute system code, mostly ERUS processing.
There is less benefit if there is a lot of user written code executed, ADS, COBOL, Assembler, see Article 39312 - How to know if zIIP is beneficial for a CA IDMS CV.
If after applying the PTFs performance with zIIP is not good then it means your workload is not suited to the use of zIIP.
Additional Information
The requirements for using zIIP in IDMS are documented in the section zIIP Exploitation.
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