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Limit CICS CPU resource

 
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vasanthz

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Joined: 28 Aug 2007
Posts: 1497
Location: Chennai

PostPosted: Tue Jan 31, 2017 7:09 am    Post subject: Limit CICS CPU resource
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Hi,

We have test CICS regions and occasionally when the test CICS region transaction rates go up, it affects prod and test BATCH in the same LPAR.
We are trying to protect other workloads from test CICS and set a CAP on the service class.

http://www.redbooks.ibm.com/redbooks/pdfs/sg246472.pdf says that type 2 resource groups can be setup, so that a particular service class does not exceed X percent of CPU.
But the WLM manual also says that the resource group cannot be setup for service classes containing CICS regions. :-(
and resource groups can be setup for individual CICS regions.

Is there a way to limit the CICS regions/service classes to use only certain % of LPAR share.

Just as a experiment, I created a resource group in test LPAR like below,
Code:
                         Modify a Resource Group     
Command ===> _________________________________________
                                                     
Enter or change the following information:           
                                                     
Resource Group Name  . . . . : CICSCAP               
Description  . . . . . . . . . LIMIT CICS REGION     
                                                     
Define Capacity:                                     
2   1.  In Service Units (Sysplex Scope)             
    2.  As Percentage of the LPAR share (System Scope)
    3.  As a Number of CPs times 100 (System Scope)   
Minimum Capacity . . . . . . . ________               
Maximum Capacity . . . . . . . 20                     

And assigned it to the CICS service class
Code:
                         Modify a Service Class               Ro
Command ===> ____________________________________________________
                                                                 
Service Class Name . . . . . : CICSTEST                           
Description  . . . . . . . . . Test AOR's                       
Workload Name  . . . . . . . . CICSTEST  (name or ?)             
Base Resource Group  . . . . . CICSCAP   (name or ?)             
Cpu Critical . . . . . . . . . NO        (YES or NO)             
                                                                 
Specify BASE GOAL information. Action Codes: I=Insert new period,
E=Edit period, D=Delete period.                                 
                                                                 
        -- Period --  ------------------- Goal ------------------
Action  #  Duration   Imp.  Description                         
  __    _  _________   _    _____________________________________
  __    1  _________   3    Execution velocity of 5             

It accepted the resource group and did not come up with any error. Would this work?

We run CICS as STC's and high response times for test CICS regions are acceptable.

Evidently I am a WLM novice, so could you please guide.

Regards,
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