ESP Workload Automation CPUSTATS command zIIP stats

Products

• ESP Workload Automation

Issue/Introduction

Using the CPUSTATS command and try to understand what are the meanings of the numbers:

TaskId TaskName Thread  TOT_CPU TCB_CPU SRB_CPU zIIPed  TCB>SRB
007200 MainTask CkptMgr 6:36.30 2:10.91 4:25.40 4:24.81 946079

Is the zIIPED the amount of time from the TOT_TCB or the TCP_CPU or the SRB_CPU?

Of the TOT_TCP the amount spent in the zIIP is 4.24.81 or about 2/3s of the work is on the zIIP?

Second what does the TCB>SRB column represent? What is that number and how is it calculated?

Environment

ESP Workload Automation 

Resolution

When ESP/WSS runs with PARM=zIIP, it must employ SRB mode. This is a requirement of the zIIP CPU.

SRB mode can also be used outside zIIP, with conventional CPU. That’s why the zIIPed time is very close to the SRB_CPU time, but not a 100%.

Yes, here, 2/3 of CPU was spent by the Check Point Manager on the zIIP CPU.

The last column represents a TCB to SRB switch count, i.e. how many times a particular thread switched from TCB to SRB mode. Or, It’s fair to say how many times ESP/WSS switched from the conventional CPU to the zIIP one.