Benchmarking Performance and Scalability with Web Stress
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  • 1. WebStress AcademyBill McCormick & Pat McGibbonGlobal Summit 2011
  • 2. WebStress Academy • Agenda – Introduce the tool – Record a script – Edit the script – Randomization – Define a test with more then one or more scripts – Execute a benchmark run – Validate the run
  • 3. What is WebStress • A utility being shipped as part of the product in 2011 • A tool that allows for recording http traffic between any client and server that supports running thru a proxy • Allows for customizing and randomizing the data being utilizied from a given recorded base script • Can play back multiple recordings simultaneously to simulate load and verify results, including performance metrics
  • 4. Why WebStress? • TrakCare performance evaluations required for certain bids – Brisbane – Edinburgh • LoadRunner and other tools for this can be very expensive • Managing CSP / Zen based applications requires a few little tricks to benchmark correctly • Has been used in dozens of benchmarks since 2002
  • 5. Some core concepts • Controller – Manages the playback of a test and gathers results • Generator – Machine that is executing the script and randomization logic during playback. Can be same machine as controller • WebServer – The URL that the application is running over. In the case of a Cache system it also allows us to connect to the server • App Server – The actual database being used by the test under Cache
  • 6. Continued • NoEncrypt Flag – Sets the flag that allows benchmark recordings and playback to work on CSP / Zen based solutions • No Delay – For non page content ignore recorded delays – js, html, css, jpg etc • No Results – For non page content ignore results – js, html, css, jpg simulates cacheing
  • 7. Continued • Scripts – A collection of http requests that from a UI perspective represent a “transaction” or “workflow” • Tests – A collection of scripts that when combined represent a “server usage profile” • Save Page Source – For verification purposes this will loop over a script and save the returned page content to a local directory
  • 8. Recording • WebStress has a facility that launches a listener on a defined port • A browser for example can be configured to use this port as a proxy and we capture the output • We will offer to set the no encrypt flag for a given cache service when the listener is launched • The recorder also generates a routine for providing randomization logic • Exercise 1
  • 9. Customizing a Script• Once a recording is completed we can edit it to change settings and values or completely randomize data being used – Parameters • These are name value pairs that were submitted via http – Http Headers • This is the information your browser added to the http request when it was POSTed or GET – URLs • These are the individual http requests captured. They can be removed or manually added• Exercise 2
  • 10. Creating a Test • Controls the playback of the various scripts – Scheduled – Start now – Run time – Warm up / Cool down – Using Delays – Page Source
  • 11. Tests Continued • Adding Scripts – Select a script – Choose a Web Server – Define the rate • Sessions • Processes – URL Loopback – Target • Repeat as needed
  • 12. Tests Continued • Adding Scripts – Select a script – Choose a Web Server – Define the rate • Sessions • Processes – URL Loopback – Target • Repeat as needed • Exercise 3
  • 13. Running a Benchmark • Preparing a Test – Starts the processes on the Generator – Starts the controller’s listener that drives the generators and collects the data • Run the Test – The Controller sends the start signal to the generators – Results are ignored for the duration of the “warm up” – Live results display on this page • After the test – Results are processed – Jobs Halted
  • 14. Running a Benchmark - Cont • While the test is running you will see information on the current Rates Per Minute. These are color coded to indicate how close to your target for a given script you are doing. • If you need to you can stop a test, adjust the settings for the Sessions and Processes and rerun the test again to aim closer to target
  • 15. Continued • Exercise 4
  • 16. Debug Mode • You have the option to run a script and have the returned pages be stored to disk. This is very handy for debugging a script and validating that things are performing correctly. • To do this we specify the Source Directory and the Save Page Source options in the test settings. • This creates a structure at that location that represents each script, and each time we looped thru the URLs
  • 17. Continued • Exercise 5
  • 18. WebStress Summary • Runs on 2011.1 • Can be used against any http based application • Https not supported at this time • Keep Alive must be disabled during recording
  • 19. WebStress Academy • Thank you • Bill McCormick - bill.mccormick@intersystems.com • Pat McGibbon - pat.mcgibbon@intersystems.com • Iain Bray - Lead developer
  • 20. WebStress AcademyBill McCormickGlobal Summit 2011