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Status Not under consideration
Workspace CICS Transaction Server for z/OS
Categories Runtime
Created by Guest
Created on Jan 17, 2018

RELATED IDEAS

OTE, Threadsafe and Concurrency Statistics

As part of our threadsafe project, post execution, we review the changes to the programs' PPT definitions, after defining them as Concurrency: Threadsafe. We use: DFH0STAT, SMF 110 performance data and SYSVIEW.

We review a number of statistics. Amongst others:

• QR TCB/CPU Dispatch Ratio. (for TCB starvation)
• Transactions per second.
• CPU consumption by transaction.
• Elapse time by transaction.
• Redispatch wait time

We know an open TCB is assigned to a CICS task, for its sole use. And, that multiple OTE TCBs can run concurrently in CICS. And, that for the thread safe programs, each TCB is a thread where a CICS program can run in parallel. And, also that the tasks run concurrently.

But, crucially, there is no obvious way to subsequently determine, what might be termed: true task concurrency. That is, for multiple tasks on the L8 TCB - threading through the same program - in terms of the High Water Mark.

Can you consider an RFE here which might be a report, or a program statistic which shows: L8 TCB Concurrency HWM for Task=>Program. Whether this information can already be derived in an alternative way, using the existing statistical data, is also a valid question. This would then obviate the need for such an RFE.

Idea priority Low
  • Guest
    Reply
    |     May 22, 2018

    We have assessed this requirement. We have no current plans for this to be implemented and indeed do not see how this could be technically achieved.

  • Guest
    Reply
    |     Jan 29, 2018

    You asked:
    >Correct me if I am wrong, but I think you are asking for a HWM of TCBs executing code in the same >CICS program. I don't know how this could be done

    I am indeed.

    Right now we have no standard method to show L8 TCB usage, in terms of concurrency, for tasks executing in the same program. When I say no method, I'm referring to displaying or generating TCB stats which might be able to quickly show, the positive benefits accrued, in terms of task concurrency; that is, after a threadsafe conversion exercise for a pgm or pgms.

    I do acknowledge that Fraser Bohm had previously explained the enormous architectural difficulty in doing this. But, unless I'm mistaken, he also suggested that there might be a way, as part of exploring and reviewing multiple pieces of gathered data, and using these to present this information in such a way as to see the throughput gains which had been achieved, post threadsafe conversion.

    I hope this makes sense.

    Thank you. Regards, Leo.

  • Guest
    Reply
    |     Jan 18, 2018

    Correct me if I am wrong, but I think you are asking for a HWM of TCBs executing code in the same CICS program. I don't know how this could be done.

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