SYSVIEW - How to measure CPU performance using Explore Report Writer - for a specific task
Article ID: 271750
Updated On:
Products
Issue/Introduction
Most of the times when there is batch delays, we are informed that DFHSM is the cause. But the performance team cannot pin point that it is actually DFHSM. It's because DFHSM is under a certain service class, and that service class consumes higher percentage of cpu during batch time, so DFHSM is the suspect. I need help to prove that DFHSM is not the culprit but i don't know how to take hourly measurements to prove otherwise. I am also implementing zEDC on DFHSM this weekend so CPU usage is expected to increase but I doubt it will cause batch delays. I need to show some kind of performance before and after zEDC goes in.
Environment
SYSVIEW R16.0
Resolution
A number options and methods were presented during the case.
Job to Dump and Report
The JCL and Report Writer parameters I used are as follows.
//*===================================================================*
//* Cleanup
//*-------------------------------------------------------------------*
//S1 EXEC PGM=IEFBR14
//DD1 DD DSN=SYSVIEW.SMF30.DUMP,DISP=(MOD,DELETE,DELETE),
// SPACE=(TRK,(1,1)),UNIT=SYSDA
//*
//*-------------------------------------------------------------------*
//* Collect SMF records from SMF LOGSTREAM
//*-------------------------------------------------------------------*
//SMFDUMP EXEC PGM=IFASMFDL
//STEPLIB DD DISP=SHR,DSN=SYS1.LINKLIB
//*
//OUTDD1 DD DSN=SYSVIEW.SMF30.DUMP,
// DISP=(,CATLG,DELETE),SPACE=(CYL,(400,500),RLSE),
// DCB=(RECFM=VBS,LRECL=32756,BLKSIZE=32760),
// UNIT=SYSDA
//SYSPRINT DD SYSOUT=*
//SYSOUT DD SYSOUT=*
//SYSIN DD *
LSNAME(IFASMF.$SSID.STREAM,OPTIONS(DUMP))
OUTDD(OUTDD1,TYPE(30))
DATE(2023222,2023222)
/*
//*-------------------------------------------------------------------*
//* Run report
//*-------------------------------------------------------------------*
//REPORT1 EXEC PGM=XPFRMAIN,REGION=4M,PARM='COPYRIGHT=NO'
//STEPLIB DD DISP=SHR,DSN=SYSVIEW.XXX.XXX.LOADLIB
//ERPTPRM DD DISP=SHR,DSN=SYSVIEW.XXX.SYSVW170.XXX.CNM4RSAM
//SYSPRINT DD SYSOUT=*
//SYSUDUMP DD SYSOUT=*
//SYSOUT DD SYSOUT=*
//TAPSMF DD DISP=SHR,DSN=SYSVIEW.SMF30.DUMP
//SYSIN DD *
OPTION(ZEROFLD=ZERO,PRINT=DATETIME,MAXTO=NO,SUMMARY=NO)
TITLE1 DFHSM CPU usage over 24 hours
SELECT JOBID(DFHSM)
TAB DATETIME JOBID,
MVS SYSTEM STEP %CPUINT AND,
MVS SYSTEM STEP ACTIVE AND,
MVS SYSTEM STEP CPU AND,
MVS SYSTEM STEP %CPUACT
EACH 1 HOUR
END
RUN
/*
Additional Information
Explore Report Writer can report directly from SMF records and does NOT require changes to SysView in this instance.
DUMP SMFDATA from SYS1.MANx datasets.
//SMFDUMP EXEC PGM=IFASMFDP
//STEPLIB DD DISP=SHR,DSN=SYS1.LINKLIB
//*
//INDD1 DD DISP=SHR,DSN=SYS1.MAN?
//*
//OUTDD1 DD DSN=SYSVIEW.SMFDMP.DS,DISP=(,CATLG,DELETE),
// DCB=(RECFM=VBS,LRECL=32756,BLKSIZE=32760),
// SPACE=(CYL,(100,200)),UNIT=SYSDA
//SYSPRINT DD SYSOUT=*
//SYSOUT DD SYSOUT=*
//SYSIN DD *
INDD(INDD1,OPTIONS(DUMP))
OUTDD(OUTDD1,TYPE(30))
DATE(yyyyddd,yyyyddd)
START(hhmm)
END(hhmm)
/*
Dumping SMF Log stream Data
//SMFDUMP EXEC PGM=IFASMFDL
//STEPLIB DD DISP=SHR,DSN=SYS1.LINKLIB
//*
//OUTDD1 DD DSN=ZS00222.SMF30.DUMP,
// DISP=(,CATLG,DELETE),SPACE=(CYL,(400,500),RLSE),
// DCB=(RECFM=VBS,LRECL=32756,BLKSIZE=32760),
// UNIT=SYSDA
//SYSPRINT DD SYSOUT=*
//SYSOUT DD SYSOUT=*
//SYSIN DD *
LSNAME(XXX.XXX.SMF.DAILY.G7411V00,OPTIONS(DUMP))
OUTDD(OUTDD1,TYPE(30))
DATE(2023222,2023222)
/*
Also refer KD272278 for details on how to use Capture and SysView in REXX to obtain CPU usage data.
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