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IIPHONORPRIORITY and zIIP offload

 
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vasanthz

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Location: Tiruppur, India

PostPosted: Thu Jul 02, 2020 10:25 pm    Post subject: IIPHONORPRIORITY and zIIP offload
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Just thought of sharing an year old article, but came across only today.

At first glace about IIPHONORPRIORITY option, it might be a no brainer to set it as NO.

IIPHONORPRIORITY is a parameter in the IEAOPTxx member of the z/OS data set called SYS1.PARMLIB. The value of the parameter can be set to NO or YES. Essentially, those two settings have the following meanings:

YES - Honor the priority of zIIP-eligible tasks (per the z/OS LPAR's workload manager policy), so that in the event that such a task is ready for dispatch and the LPAR's zIIP engines are busy, allow the task to be dispatched to a general-purpose engine so that wait-for-dispatch time for the task will not be too high.
NO - Regardless of the priority of zIIP-eligible tasks, limit the processing of such tasks to zIIP engines. If a zIIP-eligible task is ready for dispatch and the LPAR's zIIP engines are busy, require that the task wait until a zIIP engine becomes available.


But after reading more detail into it from this link -
http://robertsdb2blog.blogspot.com/2019/05/db2-for-zos-iiphonorpriority-and-ziip.html
when IIPHONORPRIORITY=NO is in effect, "Db2 does not allow system tasks to become eligible for zIIP processing."
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Rohit Umarjikar

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PostPosted: Thu Jul 02, 2020 10:52 pm    Post subject:
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https://www.dbisoftware.com/db2nightshow/20170616DB2NightZ79.pdf

Only if needs to do more deeper drives on this and related subject.

We converted most of our Cobol-Stored Procedures to Native to get advantage of zIIP processing as WLM set it up that way.
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