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Optimizing Batch Job Performance

Optimizing Batch Job Performance. Optimizing Batch Job Performance. Resources Consumed by Program I/O by Database File Name Delays Caused by Object Locks Heaviest Active Job Function Names Record Lock Contention Time Spent on Job Status CPU by Line of Source Code

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Optimizing Batch Job Performance

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  1. Optimizing Batch Job Performance Optimizing Batch Job Performance • Resources Consumed by Program • I/O by Database File Name • Delays Caused by Object Locks • Heaviest Active Job Function Names • Record Lock Contention • Time Spent on Job Status • CPU by Line of Source Code • Duration of ILE Modules • Elapse Time by ILE Procedure Name

  2. System Navigator Identify Job Level Bottleneck First!!

  3. Workload Navigator Is the job CPU, Memory or I/O bound?

  4. Resources Consumed by Program Resources Consumed by Program • “Job” versus “Job Stream” • Application or Operating System • CPU, I/O, Memory, Elapse Time • Date Routines, Tax Calculation Routine • Imbedded SQL, High Initiation/Termination • Stand-alone or Hundreds of Calls • ILE w/ Many Modules versus OPM Program

  5. Operating System Level Operating System Level

  6. Application Level Application Level

  7. I/O by Database File Name I/O by Database File Name • Compare Percent Reads to Writes/Updates • Number of I/Os versus Records in File • Small I/O Counts, Files Opening/Closing • High Sequential Reads, Low Random Reads • Time to Purge or Move Some Data? • “Open Orders” File w/ 7 Years of Closed • Proper Logical Views for Quick Access

  8. I/O Example

  9. Delays Caused by Object Locks Delays Caused by Object Locks • Work Files that Should be in QTEMP • Separate Data Libraries per Location? • Hundreds of Jobs Daytime, One Job at Night • Rare Situations Require Exclusive Locks! • CPYF CRTFILE(*YES) vs. CRTDUPOBJ • Fix the Job, Don’t Live w/ Consequences • Older Code more Prone to Locking Issues

  10. Lock Wait Job Status

  11. Locks by Object Name

  12. Heaviest Active Job Function Names Heaviest Active Job Function Names • Job Going In and Out of Short DLYJOBs • Operating System Rebuilding Access Paths • Job Copying Data with Selection Criteria

  13. Job Function Example

  14. Record Lock Contention Record Lock Contention • Don’t Single Thread, Fear of Record Locks • Not a Bigger Issue at Night versus Daytime • Automatic Notification and Retry • Monitor Time Spent in Lock Wait Status • Release Records in Code if Causing Delays

  15. Record Lock Example

  16. Time Spent on Job Status Time Spent on Job Status • Never Ending Job, Always in RUN Status? • Nightly Job, not Always in RUN Status? • DLYJOB used as Bad Timing Technique • Object Locks for Long Periods of Time • Short Object Locks, Thousands of Times • Data Queue Wait that Never Waits! • Job Waits on Message for Hours Nightly

  17. Job Status Example

  18. CPU by Line of Source Code CPU by Line of Source Code • Is There One Bad Line of Code? • SETON LR at end of Date Routine • CHAIN to CustMast for Every Line Item • Open/Close 50 Files for Each Line Item • OPNQRYFs are 73% of CPU and Elapse • CALL to Tax Routine, 85% of Elapse • Format Date Routine, 93% of Duration

  19. Source Code Example

  20. Duration of ILE Modules Duration of ILE Modules • Complex ILE Bound Program • Identify Specific Module Causing Delays • Date Routines, Tax Calculation Routine • Older Routines, Called for Every Line Item • Outside Loop, Now that Impact is Known

  21. ILE Modules Example

  22. Elapse Time by ILE Procedure Name Elapse Time by ILE Procedure Name • Identify High Use Subroutines • Optimize Those Routines • Minimize Calls to Intensive Routines • Pinpoint Section of Code Needing Rework

  23. ILE Procedure Name Example

  24. Q&A Questions & Answers To receive MB Software’s FREE performance evaluation: 1. Register at http://www.mb-software.com2. Download and install software on AS/400 or iSeries3. Call (800) 713-5034 to schedule your free performance review session What To Expect: After allowing performance data to accumulate for one full business day, you will log into a secure area of MB Software’s web site. We will then have a conference call to discuss our findings and how you can gain performance improvements with your existing applications. It’s that easy!

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