Friday, February 1, 2008

  1. 􀁺What is OpenSTA?

  2. 􀁺How OpenSTA Works

  3. 􀁺Creating Scripts

  4. 􀁺OpenSTA Collectors

  5. 􀁺Creating Tests

  6. 􀁺Running Tests

  7. 􀁺Analyzing Results

What is OpenSTA?

  1. 􀁺OpenSTA HTTP/S Load

  2. Open System Testing Architecture

  3. Load testing is the only available module

  4. 􀁺Open source software –freely distributed

  5. 􀁺Enables performance testing of

  6. Web applications

  7. Other apps that use HTTP protocol

  8. 􀁺Available at

How OpenSTA Works

  1. 􀁺Script Modeler: Create and edit scripts

  2. 􀁺Commander: Create and run tests

  3. 􀁺Name Server: Manages distributed machines

  4. 􀁺Each virtual user is run in a separate thread

  5. Up to about 1500 VUsper machine

  6. Load can be generated from multiple machines

Creating Scripts

  1. 􀁺Record interactions with a web server

  2. Gateway records requests and responses

  3. Can record HTTPS transactions

  4. Automatically captures cookies

  5. Saves original web content

  6. 􀁺Add timers to measure tasks

  7. 􀁺Modify submitted data

  8. 􀁺Modify wait times

OpenSTA Scripts

  1. 􀁺Scripts recorded in SCL language

  2. Fairly simple coding language

  3. Limited built in functions

  4. Can write own functions in include files

  5. 􀁺Good variable management

  6. Different variable scopes

  7. Random or sequential lists

  8. Variable generation

OpenSTA Collectors

  1. 􀁺Able to monitor performance during tests

  2. 􀁺For Windows servers uses standard Performance Monitor

  3. 􀁺SNMP collectors for other server OS

  4. 􀁺Monitor during test run

  5. 􀁺View and report on results afterward

Creating Tests

  1. 􀁺Tests determine how to generate load

  2. 􀁺One or more task groups in a test

  3. One or more scripts per task group

  4. One collector per task group

  5. 􀁺For each task group configure

  6. Start and end settings

  7. Total virtual users and ramp up

  8. Machine to run on

Running Tests

  1. 􀁺Start test from controller machine

  2. Each task group starts based on start settings

  3. Scripts automatically run on designated machines

  4. 􀁺Monitor test execution during test run

  5. View collector and script data

  6. View number of VUs

  7. 􀁺Stop test run

  8. Manually

  9. According to task group settings

Analyzing Results

  1. 􀁺Numerous reports automatically generated

  2. Timer Values vs. Elapsed Time

  3. Timer Values vs. Number of Users

  4. HTTP Bytes/Sec

  5. HTTP Response Times vs. Number of Users

  6. 􀁺Filter data in reports

  7. 􀁺Export all data to Excel

  8. Analyze with Pivot Tables

  9. Compare with previous runs (not built in)


  1. 􀁺OpenSTA capabilities

  2. Record and run against any HTTP/S server

  3. Distributed load generation

  4. Configurable user ramp-up

  5. 􀁺Active user community

  6. 􀁺Active development

  7. 􀁺“Free”

  8. 􀁺

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