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Load Testing is Easy, Good Load Testing is Not. Preparation is the Difference.

Load Testing is Easy, Good Load Testing is Not. Preparation is the Difference. Chris Lynn - Safeway, Inc. Dennis Sherman - Safeway, Inc. Disclaimers. There will be no Greek letters in this presentation. This is an INTRODUCTORY starting point, not an all inclusive list of everything.

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Load Testing is Easy, Good Load Testing is Not. Preparation is the Difference.

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  1. Load Testing is Easy, Good Load Testing is Not. Preparation is the Difference. Chris Lynn - Safeway, Inc. Dennis Sherman - Safeway, Inc.

  2. Disclaimers • There will be no Greek letters in this presentation. • This is an INTRODUCTORY starting point, not an all inclusive list of everything. • If you are an advanced load tester then this might be therapy for you to see the same problems in other organizations.

  3. Who is the audience? • How many of you have participated in load testing for 1, 3, 5, 10 years? • How many of you have used/use currently LoadRunner, QALoad, eTester, SLAMD, Load Copient, other? • What percentage of projects you have load tested passed all performance and throughput requirements without any rework of the application? (1%, 5%, 10%, 20%) • How Many are Load Testers, Capacity Planners, Other?

  4. How do you feel? • Often surprised (the bad kind) by my production performance when a new application is released? • I am missing something in my testing? • Production performance doesn’t match the performance in testing? • Do you feel lucky, punk?

  5. What is the Purpose of Testing?What do you want to learn? • Performance Evaluation • Performance Tuning • Stress • Stability • Availability Avoid re-work and wasted work

  6. Who Is Involved? Roles/Responsibilities • Test Manager • Load Tester • Application/Business Representatives • Capacity Planner • Server Engineer • Network Engineer

  7. Know The Business Requirements (not “Business Hopes”) • SLA’s • Transaction Response Times • Throughput • Availability Requirements • # real users • Concurrency (application/logged in, application active, transaction)

  8. Define the Scope of Testing • Time • Potential Liklihood of change • Sufficient Load Generation Capacity • Just the online application, or also the batch, reporting, ETL, middleware, annual processing, alternate clients (wireless, time clocks) etc. • LAN/WAN

  9. Test Environment Considerations • Hardware/Platform • Size • Versions • Load Balancing • Network Simulation • Software Infrastructure • Application Functionality • Monitoring Tools

  10. Other Considerations • Usage Patterns • Transaction Mix • Load Generation Limitations • 1000 real users doesn’t always require 1000 VU’s

  11. Test Tracking and Reporting • Test Parameters (repeatability) • Test Results • Throughput • Response times • System impacts

  12. Sample Test Tracking

  13. Sample Results Tracking

  14. LDAP Sample Log

  15. It Can Get Very Complex

  16. Templates Available • Transaction Mix Identification • Test Plan Creation • Load Generator Identification/Installation/Operation • Initial/Validation Tests • Initial/Validation Report • Primary Load/Performance Tests • Primary Load/Performance Report

  17. Sample Results

  18. Conclusions • Planning Makes All the Difference!!! • Know Why You Are Testing • Understand The Test Environment • Understand The Business/Customer Requirements • Know Who To Involve Test Like The Wind

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