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CPUTime in CSYSDATA is different than MVS_CPUTIME in Batch report.

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Article ID: 243882

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Updated On:

Products

SYSVIEW Performance Management

Issue/Introduction

The value displayed in the CPUTime column of the CSYSDATA display is different than the MVS_CPUTIME obtained running a batch report.

 

For example:

 

Taking as a sample the following record in CSYSDATA the CPUTime is 0.005447

 

Cmd Jobname  Date     Time        Trans Lifetime  CPUTime 
___ CICSTST1 15/06/22 04:45:01        1 0.006103 0.005447

 

Running the following job:

//jobcard
// SET SMFIN='HLQ.SYSD.BR01'
//REPORT   EXEC PGM=XPFRMAIN                                   
//STEPLIB  DD DISP=SHR,DSN=HTML.SYSVIEW.R160.CNM4BLOD        
//ERPTPRM  DD DISP=SHR,DSN=HTMLSYSVIEW.R160.CNM4RSAM        
//SYSUDUMP DD SYSOUT=*                                         
//SYSPRINT DD SYSOUT=*                                         
//TAPSMF   DD DISP=SHR,DSN=&SMFIN,                             
//            SUBSYS=(LOGR,GSVXLGEX,                           
//            'FROM=OLDEST,TO=YOUNGEST',                       
//            'STATS,NORDW'),                                  
//            DCB=(DSORG=PS,RECFM=VB,LRECL=32756,BLKSIZE=32760)
//SYSIN    DD *             
COPY GSVSMF28                                               
SELECT JOBNAME(CICSTST1)                                    
EXCLUDE SATURDAY                                            
EXCLUDE SUNDAY                                              
OPTION(SUMMARY=NO,DATAONLY=NO,COPYRIGHT=NO)                 
TAB DATETIME,                                               
CICS_JOBNAME,                         HDR1( ) HDR2(JOBNAME ),
CICS INTERVAL SYSTEM MVS_CPUTIME      HDR1( ) HDR2(CPU)     
EACH 15 MINUTES                                             
END                                                         
RUN                                                         
/*                                                          
//    

 

The output is:

 

  DATE    TIME  JOBNAME     CPU     
-------- -----  -------- ----------
06/15/22 04.30  CICSTST1  0.324893

 

The CPU time is 0.324893 which is different than the CPUTime displayed in CSYSDATA

Why there is this difference?

 

Environment

Release : 16.0

Component : SYSVIEW

Cause

Selecting in CSYSDATA the record corresponding to 04:45:01 you will see detailed information for this interval.

In the Degradation Analysis section there is the following information:

 

Degradation Analysis --------------------------------

Resource                              Total  Average
Transaction lifetime                         0.006103
Dispatch time                       
Dispatch time - MS TCB              
Dispatch time - QR TCB              
CPU time                                    0.005447

 

The CPUTime column in CSYSDATA corresponds to the CPU time average in the degradation analysis section

Below the Degradation Analysis section, there is another section named MVS Information which is the MVS address space statistics for the CICS region.

 

MVS Information ------------------------------------

Description                              Value     
CPU time used during interval           0.324893

 

This value of 0.324893 is the same value returned by the  MVS_CPUTIME  variable of the report and is the CPU time used by the CICS region during the interval.

 

 

Resolution

The CPUTime displayed in the CSYSDATA and the MVS_CPUTIME obtained with the batch report are different concepts.

 

The CPUTime displayed in the CSYSDATA is the average CPUTIME used by a transaction.

The MVS_CPUTIME obtained with the batch report is the  CPU time used by the CICS region during the interval.