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Status Not under consideration
Created by Guest
Created on Jul 27, 2020

5698-B12 Tiv Advanced Audit DFSMShsm high events SIISStore Into the Instruction Stream case TS003903912

5698-B12 Tiv Advanced Audit DFSMShsm high events SIISStore Into the Instruction Stream

Numero del caso
TS003903912

Descrizione

We running ZOS 2.3

We running 5698-B12 Tiv Advanced Audit DFSMShsm 2.06.00

When we execute job UHSMA110 on sysplex system S2U1


we exceed the guard threshold for the percentage of SIIS events (Store Into the Instruction Stream) which caused cache Level 1 miss on the total of misses.

SIIS events are due to a code that does not respect the separation of data and instructions in the cache line.

This also happens on S2B1 system ( another sysplex ) when the analogous job runs.

We upload : smf records , joblog UHSMA110 , image from EPV monitor application .

Idea priority Medium
  • Admin
    Andrew Bowker
    Reply
    |
    Sep 20, 2023

    The issue is related to H/W and core z/OS capability of executing the machine instructions faster via cache buffer. I've communicated to our portal admin that this one needs to be transferred to the z/OS team