What fields from IBM SMF72.3 is MICS using to arrive at the fields in WLM_SEC

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Article ID: 129571

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Updated On:

Products

CA MICS Resource Management

Issue/Introduction

We're not clear on how WLMSEC file is calculated if transaction goes to a different address space like DB2 which is derived from SMF Type 72 subtype 3 record.

We want to be able to use file  WLM_SEC  to report the information.

The two fields of interest are: 

Actual Response time 25.4 milliseconds and TRX Rate 2295 (Transactions Per Second ended) 

Response Time shown in RMF III when issuing the "RTD report-class" command see below 


What fields from IBM SMF72.3 does MICS use
to arrive at the fields in WLM_SEC ? 
 

 

Environment

Release:
Component: MICS

Resolution


You asked what fields from IBM SMF72.3 MICS is  using to arrive at the fields below in WLM_SEC .

SECTCPTM - Total CPU Time 
SECPSRCP - Transactions Per Second 
SECAVNCP - Avg Transaction Execution Time 
SECAVXET - Avg Transaction Execution Time 
SECAVTET - Avg Transaction Elapsed Time 

I'm going to start with the last 4 because they are easiest to explain. 

In general, you can determine exactly how all data elements are derived by examining the DIC.TEXT members, DERIVATION section. 

2) SECPSRCP - Transactions per second 
DERIVATION from DIC.TEXT(SECPSRCP): SECPSRCP =SECTORCP / DURATION 

---where DERIVATION section for SECTORCP says: contains contents of field R723CRCP (number of completed transactions) 

DURATION is the duration of MICS observation in seconds (RMF Interval (DETAIL), or longer in DAYS, WEEKS, etc. 

3) SECAVNCP - Avg Transactions Execution Time 
DERIVATION from DIC.TEXT(SECAVNCP): SECAVNCP = SECTOXET / SECTONCP 

---where DERIVATION section for SECTOXET says: contains contents of field R723CXET (total transaction execution time ) 

SECTONCP says: contains contents of field R723CNCP (number of transactions completed execution phase) 

4) SECAVXET - Avg Transactions Execution Time 
DERIVATION from DIC.TEXT(SECAVXET): SECAVNCP = SECTOXET / SECTORCP 

---where DERIVATION section for SECTOXET says: contains contents of field R723CXET (total transaction execution time) 

SECTORCP says: contains contents of field R723CRCP (number of transactions completed) 


5) SECAVTET - Avg Transactions Elapsed Time 
DERIVATION from DIC.TEXT(SECAVTET): SECAVTET = SECTOTET / SECTORCP 

---where DERIVATION section for SECTOTET says: contains contents of field R723CTET (total transaction elapsed time) 

SECTORCP says: contains contents of field R723CRCP (number of transactions completed) 

1) SECTCPTM: Total CPU Time - this one is quite complicated. Number 1, IBM does not record CPU times in the 72-3 record. Instead it stores service units, and we must convert the service units to CPU time based on other field values. 

This element "Total CPU Time" is basically the sum of: CP Core TCB time + CP Core SRB time + normalized zAAP core CPU time + normalized zIIP core CPU time. 

1) SECTCPTM: Total CPU Time - the DERIVATION says: 

ELEMENT DERIVATION: SECTCPTM is the sum of SECCPUTM, SECSRBTM, SECZAPTM, and SECSUPTM. 

So, you must look at the DERIVATION for these 4 elements: 

a) SECCPUTM: TCB CPU Time on CP 

SECTOCPU 
SECCPUTM = ----------------------------------- - (SECZAPTM + SECSUPTM) 
WLMSCCPU*WLMSUCPU 

SECTOCPU - TCB CPU Service Units on CP - field R723CCPU 
WLMSCCPU - Service Coefficient - CPU - field R723MCPU 
WLMSUCPU - Effec. SU:CPU-second Conversion Factor - 16,000,000 / field R723MADJ 

SECZAPTM - CPU Time on zAAP (Normalized), computed as shown below: 


R723CIFA * (R723NFFI/256) 
------------------------------ 
R723MCPU * (16000000/R723MADJ) 


SECSUPTM - CPU Time on zIIP (Normalized), computed as shown below: 

R723CSUP * (R723NFFS/256) 
------------------------------ 
R723MCPU * (16000000/R723MADJ) 

b) SECSRBTM: SRB CPU Time 

SECSRBTM - SRB CPUT Time computed as shown below: 

SECTOSRB / (WLMSCSRB*WLMSUCPU) 


SECTOSRB - TCB CPU Service Units on CP - field R723CSRB (total SRB service units) 
WLMSCSRB - Service Coefficient - SRB - field R723MSRB 
WLMSUCPU - Effec. SU:CPU-second Conversion Factor - 16,000,000 / field R723MADJ 

c) and d) zAAP and zIIP CPU times are computed as shown above. .